General
Introductory Problems
- Weird Algorithm2639 / 2752
- Missing Number2013 / 2200
- Repetitions1782 / 1906
- Increasing Array1689 / 1757
- Permutations1490 / 1545
- Number Spiral1074 / 1150
- Two Knights744 / 802
- Two Sets790 / 834
- Bit Strings820 / 854
- Trailing Zeros743 / 789
- Coin Piles662 / 742
- Palindrome Reorder596 / 628
- Creating Strings I575 / 590
- Apple Division505 / 560
- Chessboard and Queens307 / 314
- Grid Paths148 / 197
Sorting and Searching
- Distinct Numbers918 / 950
- Apartments715 / 830
- Ferris Wheel681 / 747
- Concert Tickets528 / 651
- Restaurant Customers448 / 477
- Movie Festival421 / 440
- Sum of Two Values506 / 537
- Maximum Subarray Sum513 / 535
- Stick Lengths568 / 587
- Playlist502 / 642
- Towers502 / 543
- Traffic Lights317 / 350
- Room Allocation291 / 327
- Factory Machines272 / 314
- Tasks and Deadlines262 / 266
- Reading Books233 / 256
- Sum of Three Values316 / 338
- Sum of Four Values254 / 267
- Nearest Smaller Values289 / 297
- Subarray Sums I328 / 336
- Subarray Sums II232 / 294
- Subarray Divisibility244 / 257
- Array Division290 / 315
- Sliding Median266 / 303
- Sliding Cost196 / 218
- Movie Festival II138 / 179
- Maximum Subarray Sum II181 / 197
Dynamic Programming
- Dice Combinations837 / 900
- Minimizing Coins749 / 783
- Coin Combinations I652 / 683
- Coin Combinations II511 / 590
- Removing Digits634 / 647
- Grid Paths550 / 575
- Book Shop564 / 635
- Array Description350 / 390
- Edit Distance367 / 382
- Rectangle Cutting346 / 379
- Money Sums381 / 394
- Removal Game372 / 396
- Two Sets II362 / 402
- Increasing Subsequence430 / 489
- Projects284 / 325
Graph Algorithms
- Counting Rooms572 / 611
- Labyrinth358 / 439
- Building Roads390 / 403
- Message Route342 / 357
- Building Teams323 / 343
- Round Trip265 / 290
- Monsters178 / 219
- Shortest Routes I261 / 272
- Shortest Routes II254 / 273
- High Score143 / 190
- Flight Discount191 / 227
- Cycle Finding174 / 191
- Flight Routes130 / 139
- Round Trip II132 / 140
- Course Schedule173 / 181
- Longest Flight Route126 / 139
- Game Routes128 / 138
- Investigation115 / 126
- Planets Queries I108 / 117
- Planets Queries II76 / 90
- Planets Cycles59 / 64
- Road Reparation120 / 122
- Road Construction112 / 113
- Flight Routes Check90 / 98
- Planets and Kingdoms94 / 97
- Giant Pizza56 / 62
- Coin Collector73 / 80
- Mail Delivery60 / 66
- De Bruijn Sequence50 / 53
- Teleporters Path56 / 64
- Hamiltonian Flights60 / 66
- Knight's Tour51 / 57
- Download Speed64 / 68
- Police Chase59 / 64
- School Dance64 / 68
- Distinct Routes47 / 71
Range Queries
- Range Sum Queries I453 / 474
- Range Minimum Queries I380 / 404
- Range Sum Queries II379 / 396
- Range Minimum Queries II329 / 336
- Range Xor Queries337 / 340
- Range Update Queries284 / 296
- Forest Queries217 / 224
- Hotel Queries291 / 347
- List Removals166 / 180
- Salary Queries184 / 220
- Subarray Sum Queries169 / 174
- Distinct Values Queries132 / 164
- Forest Queries II105 / 113
- Range Updates and Sums83 / 106
- Polynomial Queries79 / 94
- Range Queries and Copies56 / 59
Tree Algorithms
- Subordinates280 / 289
- Tree Matching190 / 229
- Tree Diameter281 / 295
- Tree Distances I204 / 223
- Tree Distances II164 / 171
- Company Queries I136 / 142
- Company Queries II135 / 139
- Distance Queries175 / 186
- Counting Paths124 / 130
- Subtree Queries153 / 159
- Path Queries132 / 135
- Distinct Colors152 / 164
Mathematics
- Exponentiation457 / 504
- Exponentiation II284 / 362
- Counting Divisors278 / 315
- Common Divisors227 / 254
- Sum of Divisors149 / 212
- Binomial Coefficients224 / 244
- Creating Strings II150 / 162
- Distributing Apples135 / 149
- Christmas Party113 / 124
- Fibonacci Numbers152 / 183
- Throwing Dice131 / 139
- Graph Paths I81 / 92
- Graph Paths II60 / 67
- Dice Probability89 / 95
- Moving Robots46 / 54
- Candy Lottery85 / 88
- Inversion Probability81 / 84
- Stick Game98 / 103
- Nim Game I137 / 140
- Nim Game II137 / 145
- Stair Game72 / 99
String Algorithms
- Word Combinations71 / 109
- String Matching154 / 179
- Finding Borders103 / 117
- Finding Periods68 / 83
- Minimal Rotation94 / 135
- Longest Palindrome106 / 130
- Required Substring51 / 95
Additional Problems
- Shortest Subsequence219 / 256
- Counting Bits201 / 230
- Swap Game46 / 58
- Meet in the Middle92 / 114
- Prüfer Code95 / 102
- Edge Directions66 / 73
- Advertisement183 / 197
- Elevator Rides44 / 59
- Maximum Xor Subarray63 / 67
- Movie Festival Queries31 / 39
- Chess Tournament33 / 40
- Tree Traversals37 / 38
- Network Renovation30 / 43
- Graph Girth40 / 42
- Intersection Points38 / 43
- String Reorder26 / 29
- Pyramid Array23 / 32
- Increasing Subsequence II63 / 66
- String Removals78 / 82
- Bit Inversions93 / 99
- Writing Numbers86 / 97
- String Transform39 / 51
- Maximum Building I86 / 90
- Sorting Methods65 / 69
- Cyclic Array57 / 64
- Food Division37 / 45
- Bit Problem33 / 36
- Swap Round Sorting18 / 28
- Tree Isomorphism I30 / 36
- Critical Cities17 / 26
- School Excursion38 / 40
- Coin Grid22 / 32
- Robot Path11 / 20
- Course Schedule II30 / 43
- Empty String46 / 57
- Grid Paths59 / 65
- Book Shop II60 / 71
- Network Breakdown33 / 34
- Visiting Cities44 / 68
- Number Grid89 / 109
- Maximum Building II34 / 40
- Stick Divisions81 / 96
- Coding Company20 / 26
- Flight Route Requests20 / 24
- Tree Isomorphism II27 / 36
- Forbidden Cities16 / 21
- Area of Rectangles28 / 34
- Creating Offices18 / 26
- Permutations II64 / 72
- New Flight Routes15 / 31