General
Introductory Problems
- Weird Algorithm3439 / 3588
- Missing Number2671 / 2892
- Repetitions2372 / 2524
- Increasing Array2228 / 2327
- Permutations1967 / 2039
- Number Spiral1400 / 1497
- Two Knights1023 / 1093
- Two Sets1084 / 1154
- Bit Strings1186 / 1236
- Trailing Zeros1070 / 1143
- Coin Piles949 / 1060
- Palindrome Reorder853 / 904
- Creating Strings I829 / 847
- Apple Division740 / 829
- Chessboard and Queens450 / 461
- Grid Paths215 / 288
Sorting and Searching
- Distinct Numbers1270 / 1305
- Apartments938 / 1084
- Ferris Wheel893 / 986
- Concert Tickets688 / 844
- Restaurant Customers620 / 661
- Movie Festival586 / 615
- Sum of Two Values703 / 751
- Maximum Subarray Sum708 / 735
- Stick Lengths733 / 763
- Playlist646 / 810
- Towers646 / 696
- Traffic Lights408 / 471
- Room Allocation367 / 424
- Factory Machines375 / 429
- Tasks and Deadlines363 / 370
- Reading Books306 / 339
- Sum of Three Values422 / 455
- Sum of Four Values340 / 362
- Nearest Smaller Values348 / 405
- Subarray Sums I443 / 453
- Subarray Sums II325 / 394
- Subarray Divisibility326 / 348
- Array Division364 / 392
- Sliding Median321 / 367
- Sliding Cost238 / 262
- Movie Festival II188 / 238
- Maximum Subarray Sum II229 / 259
Dynamic Programming
- Dice Combinations1222 / 1309
- Minimizing Coins1069 / 1148
- Coin Combinations I985 / 1032
- Coin Combinations II788 / 905
- Removing Digits938 / 956
- Grid Paths784 / 854
- Book Shop796 / 891
- Array Description496 / 564
- Edit Distance533 / 562
- Rectangle Cutting505 / 555
- Money Sums563 / 582
- Removal Game497 / 528
- Two Sets II484 / 540
- Increasing Subsequence549 / 631
- Projects369 / 431
Graph Algorithms
- Counting Rooms819 / 874
- Labyrinth520 / 635
- Building Roads581 / 606
- Message Route505 / 540
- Building Teams476 / 502
- Round Trip387 / 427
- Monsters266 / 315
- Shortest Routes I345 / 418
- Shortest Routes II369 / 401
- High Score211 / 282
- Flight Discount239 / 316
- Cycle Finding218 / 261
- Flight Routes169 / 194
- Round Trip II175 / 207
- Course Schedule247 / 257
- Longest Flight Route147 / 222
- Game Routes196 / 208
- Investigation153 / 169
- Planets Queries I153 / 162
- Planets Queries II97 / 117
- Planets Cycles90 / 97
- Road Reparation184 / 190
- Road Construction172 / 173
- Flight Routes Check135 / 143
- Planets and Kingdoms153 / 158
- Giant Pizza100 / 106
- Coin Collector103 / 112
- Mail Delivery91 / 99
- De Bruijn Sequence75 / 78
- Teleporters Path85 / 93
- Hamiltonian Flights65 / 98
- Knight's Tour76 / 86
- Download Speed89 / 94
- Police Chase78 / 83
- School Dance99 / 103
- Distinct Routes67 / 90
Range Queries
- Range Sum Queries I629 / 653
- Range Minimum Queries I519 / 548
- Range Sum Queries II523 / 550
- Range Minimum Queries II460 / 468
- Range Xor Queries475 / 480
- Range Update Queries396 / 420
- Forest Queries294 / 303
- Hotel Queries355 / 413
- List Removals228 / 247
- Salary Queries229 / 267
- Subarray Sum Queries209 / 217
- Distinct Values Queries176 / 224
- Forest Queries II140 / 148
- Range Updates and Sums118 / 154
- Polynomial Queries107 / 124
- Range Queries and Copies74 / 77
Tree Algorithms
- Subordinates398 / 415
- Tree Matching256 / 311
- Tree Diameter372 / 392
- Tree Distances I280 / 304
- Tree Distances II229 / 238
- Company Queries I205 / 216
- Company Queries II200 / 208
- Distance Queries234 / 246
- Counting Paths166 / 175
- Subtree Queries208 / 217
- Path Queries167 / 172
- Distinct Colors190 / 208
Mathematics
- Exponentiation618 / 678
- Exponentiation II382 / 485
- Counting Divisors393 / 455
- Common Divisors305 / 342
- Sum of Divisors179 / 261
- Binomial Coefficients261 / 314
- Creating Strings II202 / 231
- Distributing Apples186 / 199
- Christmas Party144 / 163
- Fibonacci Numbers217 / 257
- Throwing Dice161 / 170
- Graph Paths I112 / 129
- Graph Paths II86 / 93
- Dice Probability116 / 128
- Moving Robots63 / 71
- Candy Lottery103 / 108
- Inversion Probability103 / 106
- Stick Game130 / 135
- Nim Game I176 / 182
- Nim Game II165 / 170
- Stair Game102 / 132
String Algorithms
- Word Combinations101 / 156
- String Matching212 / 252
- Finding Borders154 / 171
- Finding Periods97 / 113
- Minimal Rotation119 / 162
- Longest Palindrome133 / 161
- Required Substring60 / 118
Additional Problems
- Shortest Subsequence241 / 282
- Counting Bits235 / 271
- Swap Game66 / 83
- Meet in the Middle126 / 150
- Prüfer Code108 / 115
- Edge Directions96 / 103
- Advertisement204 / 216
- Elevator Rides60 / 77
- Maximum Xor Subarray84 / 89
- Movie Festival Queries34 / 43
- Chess Tournament50 / 58
- Tree Traversals49 / 50
- Network Renovation38 / 61
- Graph Girth57 / 59
- Intersection Points50 / 56
- String Reorder30 / 35
- Pyramid Array29 / 41
- Increasing Subsequence II79 / 82
- String Removals87 / 92
- Bit Inversions107 / 115
- Writing Numbers93 / 105
- String Transform48 / 59
- Maximum Building I101 / 105
- Sorting Methods70 / 75
- Cyclic Array58 / 72
- Food Division41 / 49
- Bit Problem45 / 49
- Swap Round Sorting21 / 34
- Tree Isomorphism I39 / 48
- Critical Cities21 / 36
- School Excursion52 / 54
- Coin Grid28 / 38
- Robot Path14 / 26
- Course Schedule II38 / 60
- Empty String49 / 63
- Grid Paths64 / 73
- Book Shop II69 / 80
- Network Breakdown45 / 46
- Visiting Cities57 / 78
- Number Grid97 / 118
- Maximum Building II34 / 40
- Stick Divisions91 / 106
- Coding Company23 / 31
- Flight Route Requests29 / 32
- Tree Isomorphism II34 / 46
- Forbidden Cities21 / 28
- Area of Rectangles37 / 47
- Creating Offices19 / 31
- Permutations II67 / 77
- New Flight Routes18 / 36