General
Introductory Problems
- Weird Algorithm3476 / 3626
- Missing Number2706 / 2929
- Repetitions2401 / 2553
- Increasing Array2256 / 2355
- Permutations1989 / 2063
- Number Spiral1416 / 1514
- Two Knights1036 / 1106
- Two Sets1093 / 1164
- Bit Strings1198 / 1250
- Trailing Zeros1082 / 1157
- Coin Piles957 / 1071
- Palindrome Reorder864 / 915
- Creating Strings I838 / 856
- Apple Division751 / 840
- Chessboard and Queens459 / 470
- Grid Paths219 / 293
Sorting and Searching
- Distinct Numbers1285 / 1322
- Apartments956 / 1101
- Ferris Wheel909 / 1000
- Concert Tickets695 / 855
- Restaurant Customers633 / 676
- Movie Festival598 / 627
- Sum of Two Values716 / 765
- Maximum Subarray Sum719 / 746
- Stick Lengths745 / 776
- Playlist657 / 824
- Towers654 / 705
- Traffic Lights412 / 475
- Room Allocation370 / 429
- Factory Machines382 / 436
- Tasks and Deadlines367 / 373
- Reading Books310 / 343
- Sum of Three Values431 / 463
- Sum of Four Values342 / 364
- Nearest Smaller Values354 / 410
- Subarray Sums I446 / 455
- Subarray Sums II329 / 397
- Subarray Divisibility330 / 353
- Array Division368 / 396
- Sliding Median324 / 369
- Sliding Cost240 / 265
- Movie Festival II190 / 241
- Maximum Subarray Sum II234 / 264
Dynamic Programming
- Dice Combinations1233 / 1321
- Minimizing Coins1081 / 1160
- Coin Combinations I997 / 1045
- Coin Combinations II796 / 914
- Removing Digits946 / 965
- Grid Paths796 / 865
- Book Shop807 / 902
- Array Description502 / 570
- Edit Distance541 / 570
- Rectangle Cutting512 / 562
- Money Sums568 / 587
- Removal Game504 / 535
- Two Sets II489 / 545
- Increasing Subsequence555 / 637
- Projects372 / 435
Graph Algorithms
- Counting Rooms823 / 879
- Labyrinth524 / 639
- Building Roads586 / 612
- Message Route511 / 547
- Building Teams484 / 510
- Round Trip392 / 433
- Monsters274 / 321
- Shortest Routes I352 / 424
- Shortest Routes II376 / 407
- High Score214 / 286
- Flight Discount241 / 320
- Cycle Finding220 / 263
- Flight Routes171 / 196
- Round Trip II180 / 212
- Course Schedule249 / 260
- Longest Flight Route154 / 226
- Game Routes198 / 212
- Investigation156 / 173
- Planets Queries I155 / 165
- Planets Queries II99 / 119
- Planets Cycles93 / 100
- Road Reparation185 / 191
- Road Construction173 / 174
- Flight Routes Check137 / 145
- Planets and Kingdoms154 / 159
- Giant Pizza102 / 108
- Coin Collector105 / 114
- Mail Delivery92 / 100
- De Bruijn Sequence77 / 80
- Teleporters Path87 / 95
- Hamiltonian Flights67 / 99
- Knight's Tour78 / 89
- Download Speed91 / 96
- Police Chase79 / 84
- School Dance100 / 104
- Distinct Routes69 / 92
Range Queries
- Range Sum Queries I637 / 665
- Range Minimum Queries I526 / 555
- Range Sum Queries II528 / 554
- Range Minimum Queries II466 / 474
- Range Xor Queries478 / 483
- Range Update Queries403 / 427
- Forest Queries299 / 308
- Hotel Queries360 / 418
- List Removals233 / 252
- Salary Queries235 / 273
- Subarray Sum Queries218 / 227
- Distinct Values Queries178 / 226
- Forest Queries II144 / 153
- Range Updates and Sums122 / 156
- Polynomial Queries109 / 127
- Range Queries and Copies75 / 78
Tree Algorithms
- Subordinates405 / 422
- Tree Matching259 / 312
- Tree Diameter378 / 398
- Tree Distances I282 / 306
- Tree Distances II231 / 240
- Company Queries I209 / 220
- Company Queries II205 / 213
- Distance Queries237 / 249
- Counting Paths168 / 177
- Subtree Queries211 / 220
- Path Queries169 / 174
- Distinct Colors193 / 210
Mathematics
- Exponentiation625 / 686
- Exponentiation II387 / 491
- Counting Divisors401 / 465
- Common Divisors308 / 346
- Sum of Divisors181 / 264
- Binomial Coefficients262 / 316
- Creating Strings II205 / 236
- Distributing Apples189 / 203
- Christmas Party146 / 165
- Fibonacci Numbers220 / 260
- Throwing Dice163 / 171
- Graph Paths I114 / 131
- Graph Paths II87 / 94
- Dice Probability120 / 132
- Moving Robots65 / 73
- Candy Lottery107 / 112
- Inversion Probability106 / 109
- Stick Game133 / 138
- Nim Game I180 / 186
- Nim Game II167 / 172
- Stair Game103 / 133
String Algorithms
- Word Combinations104 / 159
- String Matching217 / 257
- Finding Borders159 / 176
- Finding Periods101 / 118
- Minimal Rotation121 / 164
- Longest Palindrome135 / 163
- Required Substring64 / 122
Additional Problems
- Shortest Subsequence245 / 287
- Counting Bits237 / 273
- Swap Game69 / 87
- Meet in the Middle130 / 153
- Prüfer Code110 / 117
- Edge Directions98 / 105
- Advertisement207 / 219
- Elevator Rides62 / 80
- Maximum Xor Subarray87 / 92
- Movie Festival Queries35 / 44
- Chess Tournament51 / 59
- Tree Traversals50 / 51
- Network Renovation39 / 63
- Graph Girth58 / 60
- Intersection Points51 / 57
- String Reorder33 / 38
- Pyramid Array30 / 42
- Increasing Subsequence II80 / 84
- String Removals88 / 93
- Bit Inversions108 / 116
- Writing Numbers94 / 106
- String Transform49 / 60
- Maximum Building I103 / 107
- Sorting Methods71 / 76
- Cyclic Array59 / 73
- Food Division41 / 50
- Bit Problem46 / 50
- Swap Round Sorting22 / 35
- Tree Isomorphism I40 / 49
- Critical Cities22 / 37
- School Excursion54 / 56
- Coin Grid29 / 39
- Robot Path15 / 27
- Course Schedule II39 / 63
- Empty String50 / 64
- Grid Paths65 / 74
- Book Shop II70 / 82
- Network Breakdown46 / 47
- Visiting Cities58 / 79
- Number Grid99 / 120
- Maximum Building II35 / 41
- Stick Divisions92 / 107
- Coding Company24 / 32
- Flight Route Requests30 / 33
- Tree Isomorphism II35 / 47
- Forbidden Cities22 / 29
- Area of Rectangles38 / 48
- Creating Offices20 / 32
- Permutations II68 / 78
- New Flight Routes19 / 37