1. hiho week 176

    This week we will solve the problem "Constraint Checker". Solution is here.

    281

    2017-11-11 20:00 (+0800)

    2017-11-18 20:00 (+0800)

    registration ended
  2. hiho week 175

    This week we will solve the problem "Robots Crossing River". Solution is here.

    245

    2017-11-04 20:00 (+0800)

    2017-11-11 20:00 (+0800)

    registration ended
  3. hiho week 174

    This week we will solve the problem "Dice Possibility". Solution is here.

    302

    2017-10-28 20:00 (+0800)

    2017-11-04 20:00 (+0800)

    registration ended
  4. hiho week 173

    This week we will solve the problem "A Game". Solution is here.

    314

    2017-10-21 20:00 (+0800)

    2017-10-28 20:00 (+0800)

    registration ended
  5. hiho week 172

    This week we will solve the problem "Matrix Sum". Solution is here.

    329

    2017-10-14 20:00 (+0800)

    2017-10-21 20:00 (+0800)

    registration ended
  6. hiho week 171

    This week we will solve the problem "Email Merge". Solution is here.

    443

    2017-10-07 20:00 (+0800)

    2017-10-14 20:00 (+0800)

    registration ended
  7. hiho week 170

    This week we will solve the problem "Word Construction". Solution is here.

    224

    2017-09-30 20:00 (+0800)

    2017-10-07 20:00 (+0800)

    registration ended
  8. hiho week 169

    This week we will solve the problem "Basic Arithmetic Calculator.

    408

    2017-09-23 20:00 (+0800)

    2017-09-30 20:00 (+0800)

    registration ended
  9. hiho week 168

    This week we will solve the problem "Biinary Numbers". Solution is here.

    818

    2017-09-16 20:00 (+0800)

    2017-09-23 20:00 (+0800)

    registration ended
  10. hiho week 167

    This week we will solve the problem "Array Rearrangement". Solution is here.

    334

    2017-09-09 20:00 (+0800)

    2017-09-16 20:00 (+0800)

    registration ended
  11. hiho week 166

    This week we will solve the problem "Maze Escape". Solution is here.

    289

    2017-09-02 20:00 (+0800)

    2017-09-09 20:00 (+0800)

    registration ended
  12. hiho week 165

    This week we will solve the problem "Separating Same Characters". Solution is here.

    334

    2017-08-26 20:00 (+0800)

    2017-09-02 20:00 (+0800)

    registration ended
  13. hiho week 164

    This week we will solve the problem "Ordered Binary String". Solution is here.

    394

    2017-08-19 20:00 (+0800)

    2017-08-26 20:00 (+0800)

    registration ended
  14. hiho week 163

    This week we will solve the problem "Hilbert Curve". Solution is here.

    309

    2017-08-12 20:00 (+0800)

    2017-08-19 20:00 (+0800)

    registration ended
  15. hiho week 162

    This week we will solve the problem "Making Palindrome". Solution is here.

    319

    2017-08-05 20:00 (+0800)

    2017-08-12 20:00 (+0800)

    registration ended
  16. hiho week 161

    This week we will solve the problem " Tree or Not". Solution is here.

    317

    2017-07-29 20:00 (+0800)

    2017-08-05 20:00 (+0800)

    registration ended
  17. hiho week 160

    This week we will solve the problem " String Folding". Solution is here.

    304

    2017-07-22 20:00 (+0800)

    2017-07-29 20:00 (+0800)

    registration ended
  18. hiho week 159

    This week we will solve the problem " Region Perimeter". Solution is here.

    533

    2017-07-15 20:00 (+0800)

    2017-07-22 20:00 (+0800)

    registration ended
  19. hiho week 158

    This week we will solve the problem "Invalid Binary Numbers". Solution is here.

    330

    2017-07-08 20:00 (+0800)

    2017-07-15 20:00 (+0800)

    registration ended
  20. hiho week 157

    This week we will solve the problem "Binary Fractions". Solution is here.

    182

    2017-07-01 20:00 (+0800)

    2017-07-08 20:00 (+0800)

    registration ended
  21. hiho week 156

    This week we will solve the problem "Counting Islands". Solution is here.

    264

    2017-06-24 20:00 (+0800)

    2017-07-01 20:00 (+0800)

    registration ended
  22. hiho week 155

    This week we will solve the problem "Task Distribution".

    382

    2017-06-17 20:00 (+0800)

    2017-06-24 20:00 (+0800)

    registration ended
  23. hiho week 154

    This week we will solve the problem "Crossing Restricted Zone". Solution is here.

    224

    2017-06-10 20:00 (+0800)

    2017-06-17 20:00 (+0800)

    registration ended
  24. hiho week 153

    This week we will solve the problem "Stock Prices". Solution is here.

    259

    2017-06-03 20:00 (+0800)

    2017-06-10 20:00 (+0800)

    registration ended
  25. hiho week 152

    This week we will solve the problem "Difference of Interval Collections". Solution is here.

    252

    2017-05-27 20:00 (+0800)

    2017-06-03 20:00 (+0800)

    registration ended
  26. hiho week 151

    This week we will solve the problem "Building in Sandbox". Solution is here.

    262

    2017-05-20 20:00 (+0800)

    2017-05-27 20:00 (+0800)

    registration ended
  27. hiho week 150

    This week we will solve the problem "Demo Day". Solution is here.

    305

    2017-05-13 20:00 (+0800)

    2017-05-20 20:00 (+0800)

    registration ended
  28. hiho week 149

    This week we will solve the problem "403 Forbidden". Solution is here.

    261

    2017-05-06 20:00 (+0800)

    2017-05-13 20:00 (+0800)

    registration ended
  29. hiho week 148

    This week we will solve the problem "Font Size".

    382

    2017-04-29 20:00 (+0800)

    2017-05-06 20:00 (+0800)

    registration ended
  30. hiho week 147

    This week let's learn using bitset.

    514

    2017-04-22 20:00 (+0800)

    2017-04-29 20:00 (+0800)

    registration ended
  31. hiho week 146

    This week we will solve the problem "子矩阵求和". Solution is here.

    548

    2017-04-15 20:00 (+0800)

    2017-04-22 20:00 (+0800)

    registration ended
  32. hiho week 145

    This week we will solve the problem "智力竞赛". Solution is here.

    748

    2017-04-08 20:00 (+0800)

    2017-04-15 20:00 (+0800)

    registration ended
  33. hiho week 144

    This week we will solve the problem "机会渺茫".

    1096

    2017-04-01 20:00 (+0800)

    2017-04-08 20:00 (+0800)

    registration ended
  34. hiho week 143

    This week we will solve the problem "hiho密码".

    1650

    2017-03-25 20:00 (+0800)

    2017-04-01 20:00 (+0800)

    registration ended
  35. hiho week 142

    This week we will solve the problem "扫地机器人". Here is the solution.

    332

    2017-03-18 20:00 (+0800)

    2017-03-25 20:00 (+0800)

    registration ended
  36. hiho week 141

    This week we will solve the problem "自行车架". Here is the solution.

    363

    2017-03-11 20:00 (+0800)

    2017-03-18 20:00 (+0800)

    registration ended
  37. hiho week 140

    This week we will solve the problem "清理海报". Here is the solution.

    351

    2017-03-04 20:00 (+0800)

    2017-03-11 20:00 (+0800)

    registration ended
  38. hiho week 139

    This week we will solve the problem "买零食".

    518

    2017-02-25 20:00 (+0800)

    2017-03-04 20:00 (+0800)

    registration ended
  39. hiho week 138

    This week we will solve the problem "舰队游戏". Here is the solution.

    249

    2017-02-18 20:00 (+0800)

    2017-02-25 20:00 (+0800)

    registration ended
  40. hiho week 137

    This week we will solve the problem "建造基地". Here is the solution.

    293

    2017-02-11 20:00 (+0800)

    2017-02-18 20:00 (+0800)

    registration ended
  41. hiho week 136

    This week we will solve the problem "优化延迟". Here is the solution.

    181

    2017-02-04 20:00 (+0800)

    2017-02-11 20:00 (+0800)

    registration ended
  42. hiho week 135

    This week we will solve the problem "九宫".

    178

    2017-01-28 20:00 (+0800)

    2017-02-04 20:00 (+0800)

    registration ended
  43. hiho week 134

    This week let's learn the 2SAT problem.

    117

    2017-01-21 20:00 (+0800)

    2017-01-28 20:00 (+0800)

    registration ended
  44. hiho week 133

    This week let's learn the 2SAT problem.

    119

    2017-01-14 20:00 (+0800)

    2017-01-21 20:00 (+0800)

    registration ended
  45. hiho week 132

    This week let's learn Suffix Automaton.

    113

    2017-01-07 20:00 (+0800)

    2017-01-14 20:00 (+0800)

    registration ended
  46. hiho week 131

    This week let's learn Suffix Automaton.

    147

    2016-12-31 20:00 (+0800)

    2017-01-07 20:00 (+0800)

    registration ended
  47. hiho week 130

    This week let's learn Suffix Automaton.

    182

    2016-12-24 20:00 (+0800)

    2016-12-31 20:00 (+0800)

    registration ended
  48. hiho week 129

    This week let's learn Suffix Automaton.

    225

    2016-12-17 20:00 (+0800)

    2016-12-24 20:00 (+0800)

    registration ended
  49. hiho week 128

    This week let's learn Suffix Automaton.

    146

    2016-12-10 20:00 (+0800)

    2016-12-17 20:00 (+0800)

    registration ended
  50. hiho week 127

    This week let's learn Suffix Automaton.

    196

    2016-12-03 20:00 (+0800)

    2016-12-10 20:00 (+0800)

    registration ended
  51. hiho week 126

    This week let's learn how to use GeoHash to find near POIs.

    173

    2016-11-26 20:00 (+0800)

    2016-12-03 20:00 (+0800)

    registration ended
  52. hiho week 125

    This week let's learn GeoHash's encoding and decoding with Little Hi and Little Ho.

    153

    2016-11-19 20:00 (+0800)

    2016-11-26 20:00 (+0800)

    registration ended
  53. hiho week 124

    This week let's learn QuadTree with Little Hi and Little Ho.

    159

    2016-11-12 20:00 (+0800)

    2016-11-19 20:00 (+0800)

    registration ended
  54. hiho week 123

    This week let's keep learning suffix array with Little Hi and Little Ho.

    149

    2016-11-05 20:00 (+0800)

    2016-11-12 20:00 (+0800)

    registration ended
  55. hiho week 122

    This week let's keep learning suffix array with Little Hi and Little Ho.

    278

    2016-10-29 20:00 (+0800)

    2016-11-05 20:00 (+0800)

    registration ended
  56. hiho week 121

    This week let's keep learning suffix array with Little Hi and Little Ho.

    323

    2016-10-22 20:00 (+0800)

    2016-10-29 20:00 (+0800)

    registration ended
  57. hiho week 120

    This week let's learn suffix array with Little Hi and Little Ho.

    410

    2016-10-15 20:00 (+0800)

    2016-10-22 20:00 (+0800)

    registration ended
  58. hiho week 119

    This week let's solve the maximum weight closure problem.

    2176

    2016-10-08 20:00 (+0800)

    2016-10-15 20:00 (+0800)

    registration ended
  59. hiho week 118

    This week let's solve the problem of minimum path cover in DAG using max flow algorithm.

    1068

    2016-10-01 20:00 (+0800)

    2016-10-08 20:00 (+0800)

    registration ended
  60. hiho week 117

    This week let's solve a problem using max flow algorithm.

    659

    2016-09-24 20:00 (+0800)

    2016-10-01 20:00 (+0800)

    registration ended
  61. hiho week 116

    This week let's learn max-flow min-cut theory.

    819

    2016-09-17 20:00 (+0800)

    2016-09-24 20:00 (+0800)

    registration ended
  62. hiho week 115

    This week let's learn Ford-Fulkerson, an algorithm to solve maximum flow problem.

    333

    2016-09-10 20:00 (+0800)

    2016-09-17 20:00 (+0800)

    registration ended
  63. hiho week 114

    This week we will learn how to solve problem "Image Encryption".Here is the solution.

    295

    2016-09-03 20:00 (+0800)

    2016-09-10 20:00 (+0800)

    registration ended
  64. hiho week 113

    This week we will learn how to solve problem "Fibonacci".Here is the solution.

    356

    2016-08-27 20:00 (+0800)

    2016-09-03 20:00 (+0800)

    registration ended
  65. hiho week 112

    This week we will learn how to solve problem "Total Highway Distance".Here is the solution.

    443

    2016-08-20 20:00 (+0800)

    2016-08-27 20:00 (+0800)

    registration ended
  66. hiho week 111

    This week we will learn how to solve problem "Farthest Point".Here is the solution.

    456

    2016-08-13 20:00 (+0800)

    2016-08-20 20:00 (+0800)

    registration ended
  67. hiho week 110

    This week we will learn how to solve problem "Increase Charisma Points".Here is the solution.

    465

    2016-08-06 20:00 (+0800)

    2016-08-13 20:00 (+0800)

    registration ended
  68. hiho week 109

    This week we will learn how to solve problem "Tower Defense Game".Here is the solution.

    438

    2016-07-30 20:00 (+0800)

    2016-08-06 20:00 (+0800)

    registration ended
  69. hiho week 108

    This week we will learn how to solve problem "Memory Allocating Algorithm".Here is the solution.

    295

    2016-07-23 20:00 (+0800)

    2016-07-30 20:00 (+0800)

    registration ended
  70. hiho week 107

    This week we will learn how to solve problem "Give My Text Back".Here is the solution.

    535

    2016-07-16 20:00 (+0800)

    2016-07-23 20:00 (+0800)

    registration ended
  71. hiho week 106

    This week learn Size Balanced Tree, a kind of balanced search tree with amortized time O(logn) for each operation.

    424

    2016-07-09 20:00 (+0800)

    2016-07-16 20:00 (+0800)

    registration ended
  72. hiho week 105

    This week solve a problem using Splay Tree.

    189

    2016-07-02 20:00 (+0800)

    2016-07-09 20:00 (+0800)

    registration ended
  73. hiho week 104

    This week learn Splay Tree, a kind of balanced search tree with amortized time O(logn) for each operation.

    220

    2016-06-25 20:00 (+0800)

    2016-07-02 20:00 (+0800)

    registration ended
  74. hiho week 103

    This week learn Treap, a kind of balanced search tree whose expected depth is O(logn).

    252

    2016-06-18 20:00 (+0800)

    2016-06-25 20:00 (+0800)

    registration ended
  75. hiho week 102

    This week solve the sudoku problem with Little Hi and Little Ho, using dancing links.

    235

    2016-06-11 20:00 (+0800)

    2016-06-18 20:00 (+0800)

    registration ended
  76. hiho week 101

    Learn dancing links with Little Hi and Little Ho, the technique suggested by Donald Knuth to efficiently implement some search algorithms.

    397

    2016-06-04 20:00 (+0800)

    2016-06-11 20:00 (+0800)

    registration ended
  77. hiho week 100

    This week Little Hi and Little Ho try to solve the famous 8-puzzle problem with the famous A* algorithm.

    432

    2016-05-28 20:00 (+0800)

    2016-06-04 20:00 (+0800)

    registration ended
  78. hiho week 99

    This week Little Hi and Little Ho try to solve a chess knights meeting problem.

    253

    2016-05-21 20:00 (+0800)

    2016-05-28 20:00 (+0800)

    registration ended
  79. hiho week 98

    This week Little Hi and Little Ho try to solve an arithmetical card game -- 24 points.

    433

    2016-05-14 20:00 (+0800)

    2016-05-21 20:00 (+0800)

    registration ended
  80. hiho week 97

    Learn how to solve linear congruence equations with Little Hi and Little Ho.

    296

    2016-05-07 20:00 (+0800)

    2016-05-14 20:00 (+0800)

    registration ended
  81. hiho week 96

    Learn Euler's totient function or Euler's phi function with Little Hi and Little Ho.

    673

    2016-04-30 20:00 (+0800)

    2016-05-07 20:00 (+0800)

    registration ended
  82. hiho week 95

    Learn Extended Euclidean algorithm with Little Hi and Little Ho.

    477

    2016-04-23 20:00 (+0800)

    2016-04-30 20:00 (+0800)

    registration ended
  83. hiho week 94

    Solve the Josephus problem with Little Hi and Little Ho.

    787

    2016-04-16 20:00 (+0800)

    2016-04-23 20:00 (+0800)

    registration ended
  84. hiho week 92

    Prime or not prime: that is the question.

    755

    2016-04-09 20:00 (+0800)

    2016-04-16 20:00 (+0800)

    registration ended
  85. hiho week 92

    Prime or not prime: that is the question.

    3918

    2016-04-02 20:00 (+0800)

    2016-04-09 20:00 (+0800)

    registration ended
  86. hiho week 91

    This week we will solve the problem "Events Arrangement". Here is the solution.

    931

    2016-03-26 20:00 (+0800)

    2016-04-02 20:00 (+0800)

    registration ended
  87. hiho week 90

    This week we will solve the problem "Swimming Plans". Here is the solution.

    743

    2016-03-19 20:00 (+0800)

    2016-03-26 20:00 (+0800)

    registration ended
  88. hiho week 89

    This week we will solve the problem "Divisors". Here is the solution.

    860

    2016-03-12 20:00 (+0800)

    2016-03-19 20:00 (+0800)

    registration ended
  89. hiho week 88

    This week we will solve the problem "Coordinates". Here is the solution.

    577

    2016-03-05 22:00 (+0800)

    2016-03-12 20:00 (+0800)

    registration ended
  90. hiho week 87

    This week we will solve the problem "S-expression". Here is the solution.

    392

    2016-02-27 20:00 (+0800)

    2016-03-05 20:00 (+0800)

    registration ended
  91. hiho week 86

    This week we will solve the problem "Spring Outing". Here is the solution.

    360

    2016-02-20 20:00 (+0800)

    2016-02-27 20:00 (+0800)

    registration ended
  92. hiho week 85

    This week we will solve the problem "Numeric Keypad". Here is the solution.

    236

    2016-02-13 20:00 (+0800)

    2016-02-20 20:00 (+0800)

    registration ended
  93. hiho week 84

    This week we will solve the problem "Lucky Substrings". Here is the solution.

    186

    2016-02-06 20:00 (+0800)

    2016-02-13 20:00 (+0800)

    registration ended
  94. hiho week 83

    This week we will solve the problem "Recruitment". Here is the solution.

    67

    2016-01-30 20:00 (+0800)

    2016-02-06 20:00 (+0800)

    registration ended
  95. hiho week 82

    This week we will solve the problem "Islands Travel". Here is the solution.

    100

    2016-01-23 20:00 (+0800)

    2016-01-30 20:00 (+0800)

    registration ended
  96. hiho week 81

    This week we will solve the problem "Professor Q's Software". Here is the solution.

    133

    2016-01-16 20:00 (+0800)

    2016-01-23 20:00 (+0800)

    registration ended
  97. hiho week 80

    This week we will solve the problem "Magic Box". Here is the solution.

    173

    2016-01-09 20:00 (+0800)

    2016-01-16 20:00 (+0800)

    registration ended
  98. hiho week 79

    This week we will solve the problem "Troublesome Power Supply". Here is the solution.

    158

    2016-01-02 20:00 (+0800)

    2016-01-09 20:00 (+0800)

    registration ended
  99. hiho week 78

    This week we will solve the problem "Shortest Proper Prefix". Here is the solution.

    288

    2015-12-26 20:00 (+0800)

    2016-01-02 20:00 (+0800)

    registration ended
  100. hiho week 77

    This week we will solve the problem "Koch Snowflake". Here is the solution.

    382

    2015-12-19 20:00 (+0800)

    2015-12-26 20:00 (+0800)

    registration ended
  101. hiho week 76

    This week we will solve the problem "Suzhou Adventure". Here is the solution.

    183

    2015-12-12 20:00 (+0800)

    2015-12-19 20:00 (+0800)

    registration ended
  102. hiho week 75

    This week we will solve the problem "Colorful Lecture Note". Here is the solution.

    175

    2015-12-05 20:00 (+0800)

    2015-12-12 20:00 (+0800)

    registration ended
  103. hiho week 74

    This week we will solve the problem "Individual Income Tax". Here is the solution.

    174

    2015-11-28 20:00 (+0800)

    2015-12-05 20:00 (+0800)

    registration ended
  104. hiho week 73

    This week we will solve the problem "Arithmetic Puzzles". Here is the solution.

    171

    2015-11-21 20:00 (+0800)

    2015-11-28 20:00 (+0800)

    registration ended
  105. hiho week 72

    This week we will solve the problem "Disk Storage". Here is the solution.

    370

    2015-11-14 20:00 (+0800)

    2015-11-21 20:00 (+0800)

    registration ended
  106. hiho week 71

    This week we will solve the problem "Constellations". Here is the solution.

    210

    2015-11-07 20:00 (+0800)

    2015-11-14 20:00 (+0800)

    registration ended
  107. hiho week 70

    This week we will solve the problem "Divided Product". Here is the solution.

    371

    2015-10-31 20:00 (+0800)

    2015-11-07 20:00 (+0800)

    registration ended
  108. hiho week 69

    This week we will solve the problem "HIHO Drinking Game". Here is the solution.

    406

    2015-10-24 20:00 (+0800)

    2015-10-31 20:00 (+0800)

    registration ended
  109. hiho week 68

    This week we will solve the problem "Lost in the City". Here is the solution.

    264

    2015-10-17 20:00 (+0800)

    2015-10-24 20:00 (+0800)

    registration ended
  110. hiho week 67

    This week we will solve the problem "Clicker". Here is the solution.

    406

    2015-10-10 20:00 (+0800)

    2015-10-17 20:00 (+0800)

    registration ended
  111. hiho week 66

    This week we will solve the problem "Have Lunch Together". Here is the solution.

    488

    2015-10-03 20:00 (+0800)

    2015-10-10 20:00 (+0800)

    registration ended
  112. hiho week 65

    This week we will solve the problem "Highway". Here is the solution.

    3721

    2015-09-26 20:00 (+0800)

    2015-10-03 20:00 (+0800)

    registration ended
  113. hiho week 64

    This week we will solve the problem "Right-click Context Menu". Here is the solution.

    874

    2015-09-19 20:00 (+0800)

    2015-09-26 20:00 (+0800)

    registration ended
  114. hiho week 63

    This week we will solve the problem "Hamiltonian Cycle". Here is the solution.

    1488

    2015-09-12 20:00 (+0800)

    2015-09-19 20:00 (+0800)

    registration ended
  115. hiho week 62

    This week we will solve the problem "Browser Caching". Here is the solution.

    714

    2015-09-05 20:00 (+0800)

    2015-09-12 20:00 (+0800)

    registration ended
  116. hiho week 61

    This week we will solve the problem "Combination Lock". Here is the solution.

    473

    2015-08-29 20:00 (+0800)

    2015-09-05 20:00 (+0800)

    registration ended
  117. hiho week 60

    This week we will solve the problem "String Matching Content Length". Here is the solution.

    587

    2015-08-22 20:00 (+0800)

    2015-08-29 20:00 (+0800)

    registration ended
  118. hiho week 59

    This week we will solve the problem "Performance Log". Here is the solution.

    345

    2015-08-15 20:00 (+0800)

    2015-08-22 20:00 (+0800)

    registration ended
  119. hiho week 58

    This week we will solve the problem "Beautiful String". Here is the solution.

    384

    2015-08-08 20:00 (+0800)

    2015-08-15 20:00 (+0800)

    registration ended
  120. hiho week 57

    There is an awards event in convenience store.

    308

    2015-08-01 20:00 (+0800)

    2015-08-08 20:00 (+0800)

    registration ended
  121. hiho week 56

    Little Hi and Little Ho heard a nearby convenience store is offering a discount.

    489

    2015-07-25 20:00 (+0800)

    2015-08-01 20:00 (+0800)

    registration ended
  122. hiho week 55

    School campus network seemed to have a problem again.

    378

    2015-07-18 20:00 (+0800)

    2015-07-25 20:00 (+0800)

    registration ended
  123. hiho week 54

    Summer vacation is coming

    493

    2015-07-11 20:00 (+0800)

    2015-07-18 20:00 (+0800)

    registration ended
  124. hiho week 53

    After suffering from computer virus, Little Hi and Little Ho's school is rebuilding the campus network.

    396

    2015-07-04 20:00 (+0800)

    2015-07-11 20:00 (+0800)

    registration ended
  125. hiho week 52

    After suffering from computer virus, Little Hi and Little Ho's school is rebuilding the campus network.

    214

    2015-06-27 20:00 (+0800)

    2015-07-04 20:00 (+0800)

    registration ended
  126. hiho week 51

    Little Hi and Little Ho will face the last puzzle.

    269

    2015-06-20 20:00 (+0800)

    2015-06-27 20:00 (+0800)

    registration ended
  127. hiho week 50

    After having collected all items, little Hi and little Ho have to face to a new problem.

    436

    2015-06-13 20:00 (+0800)

    2015-06-20 20:00 (+0800)

    registration ended
  128. hiho week 49

    It's weekend, little Hi and little Ho are having fun in the dorm.

    509

    2015-06-06 20:00 (+0800)

    2015-06-13 20:00 (+0800)

    registration ended
  129. hiho week 48

    Hack? Hack!

    456

    2015-05-30 20:00 (+0800)

    2015-06-06 20:00 (+0800)

    registration ended
  130. hiho week 47

    Little Hi and Little Ho is back! Let's take a look, what happened to them today?

    466

    2015-05-23 20:00 (+0800)

    2015-05-30 20:00 (+0800)

    registration ended
  131. hiho week 46

    The third game of Alice and Bob.

    418

    2015-05-16 20:00 (+0800)

    2015-05-23 20:00 (+0800)

    registration ended
  132. hiho week 45

    Alice and Bob will play with coins this week.

    565

    2015-05-09 20:00 (+0800)

    2015-05-16 20:00 (+0800)

    registration ended
  133. hiho week 44

    Today we will meet Alice and Bob, they will give us a new series.

    930

    2015-05-02 20:00 (+0800)

    2015-05-09 20:00 (+0800)

    registration ended
  134. hiho week 43

    Let's continue dominoes game problem.

    830

    2015-04-25 20:00 (+0800)

    2015-05-02 20:00 (+0800)

    registration ended
  135. hiho week 42

    Let's continue dominoes game problem.

    2984

    2015-04-18 20:00 (+0800)

    2015-04-25 20:00 (+0800)

    registration ended
  136. hiho week 41

    This week, we still learn a new divide and conquer algorithm.

    3476

    2015-04-11 20:00 (+0800)

    2015-04-18 20:00 (+0800)

    registration ended
  137. hiho week 40

    The 5th week of learning divide and conquer algorithm. Let's study a new divide and conquer algorithm.

    1627

    2015-04-04 20:00 (+0800)

    2015-04-11 20:00 (+0800)

    registration ended
  138. hiho week 39

    The 4th week of learning divide and conquer algorithm. Let's see a classic problem.

    2159

    2015-03-28 20:00 (+0800)

    2015-04-04 20:00 (+0800)

    registration ended
  139. hiho week 38

    This week let's study a very useful application of binary search, reducing optimization problems to decision problems.

    420

    2015-03-21 20:00 (+0800)

    2015-03-28 20:00 (+0800)

    registration ended
  140. hiho week 37

    The weekly problem is also about divide and conquer algorithms.

    317

    2015-03-14 20:00 (+0800)

    2015-03-21 20:00 (+0800)

    registration ended
  141. hiho week 36

    After having studied bipartite graph, we will start a new series about divide and conquer algorithms.

    242

    2015-03-07 20:00 (+0800)

    2015-03-14 20:00 (+0800)

    registration ended
  142. hiho week 35

    Chinese New Year is about to end, Nettle's aunt ask him for last help.

    195

    2015-02-28 20:00 (+0800)

    2015-03-07 20:00 (+0800)

    registration ended
  143. hiho Week 34

    Happy Chinese New Year, Let's continue to arrange blind date.

    146

    2015-02-21 20:00 (+0800)

    2015-02-28 20:00 (+0800)

    registration ended
  144. hiho week 33

    The adventure of Little Hi and Little Ho will continue after the Spring Festival. Now let's enjoy the holidays.

    140

    2015-02-14 20:00 (+0800)

    2015-02-21 20:00 (+0800)

    registration ended
  145. hiho week 32

    "Little Hi!!! Where's the perfect solution you promised?!!! What do you mean GUESS in this last step!" little Ho says, with rage filled up his mind.

    133

    2015-02-07 20:00 (+0800)

    2015-02-14 20:00 (+0800)

    registration ended
  146. hiho week 31

    "Zero ... zero each time! It would be so convenient if they all reverse in one move as in computer!" little says, wite anger on his face.

    313

    2015-01-31 20:00 (+0800)

    2015-02-07 20:00 (+0800)

    registration ended
  147. hiho week 30

    "If ... I died after this step, little Hi, please take care of my parents ..." little Ho says, with tears in his eyes.

    387

    2015-01-24 20:00 (+0800)

    2015-01-31 20:00 (+0800)

    registration ended
  148. hiho week 29

    These is no love without reason, and there is no reduction of time comlexity without reason!

    458

    2015-01-17 20:00 (+0800)

    2015-01-24 20:00 (+0800)

    registration ended
  149. hiho week 28

    Keep looking for the bigest candy ... will make you fatter!

    703

    2015-01-10 20:00 (+0800)

    2015-01-17 20:00 (+0800)

    registration ended
  150. hiho week 27

    The minimum of all is the minimum of part!

    637

    2015-01-03 20:00 (+0800)

    2015-01-10 20:00 (+0800)

    registration ended
  151. hiho week 26

    A choice to solve huge(?) scale problem : reduce the scale by one

    680

    2014-12-27 20:00 (+0800)

    2015-01-03 20:00 (+0800)

    registration ended
  152. hiho week 25

    Algorithms... well, some of them, is just simply traversal and ... some improvement!

    726

    2014-12-20 20:00 (+0800)

    2014-12-27 20:00 (+0800)

    registration ended
  153. hiho week 24

    Well, right! Ten times of an algorithm with time comlexity of O(N^2) is good enough to take over the algorithm with time comlexity of O(N^3)! But, what if I tell you this algorithm is only writen in 5 lines?

    807

    2014-12-13 20:00 (+0800)

    2014-12-20 20:00 (+0800)

    registration ended
  154. hiho week 23

    Straightest is the shortest! But ... only in 2-dimensional graph?

    537

    2014-12-06 20:00 (+0800)

    2014-12-13 20:00 (+0800)

    registration ended
  155. hiho week 22

    To practice than to read ! And then ... practice more !

    196

    2014-11-29 20:00 (+0800)

    2014-12-06 20:00 (+0800)

    registration ended
  156. hiho week 21

    This world is no longer continuous in my eyes! Ho says so.

    248

    2014-11-22 20:00 (+0800)

    2014-11-29 20:00 (+0800)

    registration ended
  157. hiho week 20

    Segment-tree seems to be too much for RMQ problem ? Let's see some more powerful usage!

    214

    2014-11-15 20:00 (+0800)

    2014-11-22 20:00 (+0800)

    registration ended
  158. hiho week 19

    Less is more, far is near - will ST algorithm reborn after calculate less intervals?

    317

    2014-11-08 20:00 (+0800)

    2014-11-15 20:00 (+0800)

    registration ended
  159. hiho week 18

    SImple modification make easy problem really complicated ! What's the secrets that behind the RMQ problem ?!

    468

    2014-11-01 20:00 (+0800)

    2014-11-08 20:00 (+0800)

    registration ended
  160. hiho Week 17

    It is so embarrassing that Hi and Ho applied an advanced LCA algorithm but nothing goes better. How will Hi and Ho deal with this?

    394

    2014-10-25 20:00 (+0800)

    2014-11-01 20:00 (+0800)

    registration ended
  161. hiho week 16

    Select dyslexia!How will Hi and Ho do ?

    1371

    2014-10-18 20:00 (+0800)

    2014-10-25 20:00 (+0800)

    registration ended
  162. hiho Week 15

    In order to cover the uesless of algorithm, should we spent thounds to buy servers? No! Ho says so.

    1653

    2014-10-11 20:00 (+0800)

    2014-10-18 20:00 (+0800)

    registration ended
  163. hiho week 14

    Ally? Or Enemy? To be, or not to be? How can a computer solve this ?

    423

    2014-10-04 20:00 (+0800)

    2014-10-11 20:00 (+0800)

    registration ended
  164. hiho Week 13

    "We came from the same ancient!", people having same last name will say so. But which ancient is the nearest one? Hi and Ho will let you know!

    460

    2014-09-27 20:00 (+0800)

    2014-10-04 20:00 (+0800)

    registration ended
  165. hiho Week 12

    The painting on Ho's toy tree has been erased due to Ho's endless rub! What will Ho do ?

    337

    2014-09-20 20:00 (+0800)

    2014-09-27 20:00 (+0800)

    registration ended
  166. hiho Week 11

    "Diameter of tree", such a classic problem must be collected in our sets of tree problems that represents "Recursion"! Wanna know how to solve it?

    433

    2014-09-13 20:00 (+0800)

    2014-09-20 20:00 (+0800)

    registration ended
  167. hiho Week 10

    Calculating binary tree post-order traversal from given pre-order and in-order traversal is just shown up in the online test of Alibaba!~ Just come and see how Hi and Ho solve it!

    639

    2014-09-06 20:00 (+0800)

    2014-09-13 20:00 (+0800)

    registration ended
  168. hiho Week 9

    "State Compression" is useful tool to deal with many circumstances. Let's see how Hi and Ho put their cakes!

    362

    2014-08-30 20:00 (+0800)

    2014-09-06 20:00 (+0800)

    registration ended
  169. hiho Week 8

    Sometimes the division of state will be uncertain, and in this case, the state compression will help a lot!

    541

    2014-08-23 20:00 (+0800)

    2014-08-30 20:00 (+0800)

    registration ended
  170. hiho Week 7

    In another parallel universe, the story of Hi and Ho has been changed magically! What's variants of "knapsack" problem? Can we eat it? Does it tasty? And how can we eat it?

    913

    2014-08-16 20:00 (+0800)

    2014-08-23 20:00 (+0800)

    registration ended
  171. hiho Week 6

    The "0/1 knapsack" problem is not only a simply dynamic programming model! Let's see how Ho use it to solve his problem~

    538

    2014-08-09 20:00 (+0800)

    2014-08-16 20:00 (+0800)

    registration ended
  172. hiho Week 5

    You should already know the problem "Triangle of numbers", but as the Confucius says "Reviewing leads to new". So why not come and see how Hi and Ho solve it?

    445

    2014-08-02 20:00 (+0800)

    2014-08-09 20:00 (+0800)

    registration ended
  173. hiho Week 4

    Do you still remember the problem that Mr.Hexie presented in Hiho! Week 3? This time Hi and Ho will end it !

    617

    2014-07-26 20:00 (+0800)

    2014-08-02 20:00 (+0800)

    registration ended
  174. hiho Week 3

    Pattern Matching is an everlasting topic in String Processing, and KMP algorithm is the brightest one with no doubt! So come and learn it with Hi and Ho~

    669

    2014-07-19 20:00 (+0800)

    2014-07-26 20:00 (+0800)

    registration ended
  175. hiho Week 2

    String autocompletion is important both in input method and search engine, but do you know how to implemtent it?

    1624

    2014-07-12 20:00 (+0800)

    2014-07-19 20:00 (+0800)

    registration ended
  176. hiho Week 1

    You must be familiar with such a classic problem as "The longest palindrome"? But do you know the 3 kinds of way to solve it? Just have a try!

    1162

    2014-07-05 20:00 (+0800)

    2014-07-12 20:00 (+0800)

    registration ended
  177. Hiho Week 0

    Test

    2

    2014-06-28 20:00 (+0800)

    2014-07-05 20:00 (+0800)

    registration ended