General
Introductory Problems
- Weird Algorithm2650 / 2765
- Missing Number2029 / 2216
- Repetitions1797 / 1922
- Increasing Array1704 / 1773
- Permutations1502 / 1557
- Number Spiral1082 / 1158
- Two Knights753 / 811
- Two Sets799 / 843
- Bit Strings833 / 868
- Trailing Zeros753 / 800
- Coin Piles670 / 752
- Palindrome Reorder605 / 638
- Creating Strings I582 / 599
- Apple Division510 / 565
- Chessboard and Queens310 / 317
- Grid Paths150 / 201
Sorting and Searching
- Distinct Numbers930 / 960
- Apartments719 / 836
- Ferris Wheel684 / 752
- Concert Tickets531 / 654
- Restaurant Customers451 / 484
- Movie Festival424 / 444
- Sum of Two Values508 / 540
- Maximum Subarray Sum516 / 538
- Stick Lengths569 / 589
- Playlist504 / 644
- Towers504 / 546
- Traffic Lights318 / 351
- Room Allocation292 / 328
- Factory Machines273 / 315
- Tasks and Deadlines263 / 267
- Reading Books234 / 258
- Sum of Three Values317 / 339
- Sum of Four Values255 / 268
- Nearest Smaller Values289 / 297
- Subarray Sums I328 / 336
- Subarray Sums II233 / 295
- Subarray Divisibility245 / 258
- Array Division290 / 315
- Sliding Median266 / 303
- Sliding Cost196 / 218
- Movie Festival II139 / 181
- Maximum Subarray Sum II183 / 199
Dynamic Programming
- Dice Combinations840 / 902
- Minimizing Coins749 / 783
- Coin Combinations I653 / 685
- Coin Combinations II512 / 592
- Removing Digits636 / 650
- Grid Paths553 / 578
- Book Shop564 / 636
- Array Description351 / 391
- Edit Distance369 / 384
- Rectangle Cutting347 / 380
- Money Sums382 / 395
- Removal Game374 / 399
- Two Sets II365 / 404
- Increasing Subsequence431 / 490
- Projects284 / 325
Graph Algorithms
- Counting Rooms576 / 616
- Labyrinth359 / 440
- Building Roads394 / 407
- Message Route344 / 359
- Building Teams323 / 343
- Round Trip266 / 291
- Monsters179 / 220
- Shortest Routes I264 / 274
- Shortest Routes II256 / 275
- High Score145 / 192
- Flight Discount191 / 227
- Cycle Finding174 / 191
- Flight Routes132 / 140
- Round Trip II133 / 142
- Course Schedule175 / 182
- Longest Flight Route127 / 141
- Game Routes130 / 140
- Investigation116 / 127
- Planets Queries I108 / 117
- Planets Queries II76 / 90
- Planets Cycles60 / 65
- Road Reparation120 / 122
- Road Construction113 / 114
- Flight Routes Check92 / 100
- Planets and Kingdoms97 / 100
- Giant Pizza58 / 63
- Coin Collector76 / 83
- Mail Delivery61 / 67
- De Bruijn Sequence50 / 53
- Teleporters Path57 / 65
- Hamiltonian Flights60 / 68
- Knight's Tour51 / 58
- Download Speed65 / 69
- Police Chase59 / 64
- School Dance64 / 68
- Distinct Routes47 / 71
Range Queries
- Range Sum Queries I454 / 475
- Range Minimum Queries I381 / 405
- Range Sum Queries II380 / 398
- Range Minimum Queries II332 / 339
- Range Xor Queries339 / 343
- Range Update Queries286 / 298
- Forest Queries218 / 225
- Hotel Queries291 / 347
- List Removals167 / 181
- Salary Queries186 / 222
- Subarray Sum Queries170 / 175
- Distinct Values Queries134 / 168
- Forest Queries II106 / 114
- Range Updates and Sums83 / 106
- Polynomial Queries79 / 94
- Range Queries and Copies56 / 59
Tree Algorithms
- Subordinates282 / 291
- Tree Matching192 / 230
- Tree Diameter283 / 297
- Tree Distances I206 / 225
- Tree Distances II166 / 173
- Company Queries I138 / 145
- Company Queries II137 / 141
- Distance Queries177 / 188
- Counting Paths124 / 130
- Subtree Queries155 / 161
- Path Queries132 / 135
- Distinct Colors153 / 165
Mathematics
- Exponentiation461 / 509
- Exponentiation II287 / 366
- Counting Divisors281 / 318
- Common Divisors228 / 255
- Sum of Divisors152 / 215
- Binomial Coefficients226 / 247
- Creating Strings II151 / 163
- Distributing Apples137 / 151
- Christmas Party114 / 126
- Fibonacci Numbers153 / 184
- Throwing Dice131 / 139
- Graph Paths I82 / 93
- Graph Paths II61 / 68
- Dice Probability89 / 95
- Moving Robots46 / 54
- Candy Lottery85 / 88
- Inversion Probability81 / 84
- Stick Game98 / 103
- Nim Game I137 / 141
- Nim Game II137 / 145
- Stair Game73 / 99
String Algorithms
- Word Combinations71 / 109
- String Matching154 / 179
- Finding Borders103 / 117
- Finding Periods68 / 83
- Minimal Rotation94 / 135
- Longest Palindrome107 / 130
- Required Substring51 / 96
Additional Problems
- Shortest Subsequence219 / 256
- Counting Bits201 / 230
- Swap Game46 / 58
- Meet in the Middle93 / 114
- Prüfer Code95 / 102
- Edge Directions66 / 73
- Advertisement183 / 197
- Elevator Rides44 / 59
- Maximum Xor Subarray63 / 67
- Movie Festival Queries31 / 39
- Chess Tournament34 / 41
- Tree Traversals37 / 38
- Network Renovation30 / 45
- 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 I31 / 37
- 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 Cities45 / 68
- Number Grid90 / 110
- 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