General
Introductory Problems
- Weird Algorithm11821 / 12309
- Missing Number9712 / 10403
- Repetitions8554 / 9078
- Increasing Array7892 / 8248
- Permutations6974 / 7213
- Number Spiral4843 / 5288
- Two Knights3599 / 3746
- Two Sets3789 / 4111
- Bit Strings4565 / 4816
- Trailing Zeros4287 / 4574
- Coin Piles3715 / 4129
- Palindrome Reorder3263 / 3521
- Creating Strings I3159 / 3240
- Apple Division2685 / 3149
- Chessboard and Queens1609 / 1641
- Grid Paths676 / 911
Sorting and Searching
- Distinct Numbers4558 / 4711
- Apartments3005 / 3556
- Ferris Wheel2903 / 3261
- Concert Tickets2168 / 2770
- Restaurant Customers2222 / 2433
- Movie Festival2118 / 2244
- Sum of Two Values2501 / 2744
- Maximum Subarray Sum2510 / 2615
- Stick Lengths2330 / 2451
- Playlist2026 / 2398
- Towers1958 / 2141
- Traffic Lights1415 / 1618
- Room Allocation1192 / 1443
- Factory Machines1326 / 1466
- Tasks and Deadlines1304 / 1321
- Reading Books1180 / 1276
- Sum of Three Values1455 / 1601
- Sum of Four Values1108 / 1211
- Nearest Smaller Values1313 / 1389
- Subarray Sums I1506 / 1587
- Subarray Sums II1263 / 1443
- Subarray Divisibility1261 / 1331
- Array Division1084 / 1158
- Sliding Median906 / 1063
- Sliding Cost657 / 743
- Movie Festival II600 / 752
- Maximum Subarray Sum II660 / 795
Dynamic Programming
- Dice Combinations3561 / 3765
- Minimizing Coins3142 / 3339
- Coin Combinations I2858 / 3048
- Coin Combinations II2291 / 2657
- Removing Digits2710 / 2764
- Grid Paths2441 / 2529
- Book Shop2221 / 2440
- Array Description1470 / 1628
- Edit Distance1657 / 1758
- Rectangle Cutting1464 / 1612
- Money Sums1684 / 1745
- Removal Game1303 / 1406
- Two Sets II1364 / 1503
- Increasing Subsequence1486 / 1700
- Projects931 / 1070
Graph Algorithms
- Counting Rooms2330 / 2484
- Labyrinth1401 / 1778
- Building Roads1741 / 1809
- Message Route1525 / 1606
- Building Teams1457 / 1532
- Round Trip1108 / 1258
- Monsters613 / 830
- Shortest Routes I1091 / 1278
- Shortest Routes II1027 / 1109
- High Score551 / 802
- Flight Discount667 / 815
- Cycle Finding541 / 676
- Flight Routes471 / 520
- Round Trip II519 / 592
- Course Schedule688 / 725
- Longest Flight Route514 / 622
- Game Routes543 / 579
- Investigation394 / 430
- Planets Queries I432 / 467
- Planets Queries II231 / 273
- Planets Cycles268 / 295
- Road Reparation452 / 467
- Road Construction428 / 434
- Flight Routes Check350 / 372
- Planets and Kingdoms369 / 381
- Giant Pizza222 / 240
- Coin Collector259 / 286
- Mail Delivery219 / 263
- De Bruijn Sequence187 / 195
- Teleporters Path184 / 221
- Hamiltonian Flights199 / 243
- Knight's Tour185 / 209
- Download Speed201 / 212
- Police Chase186 / 196
- School Dance210 / 219
- Distinct Routes156 / 197
Range Queries
- Range Sum Queries I1701 / 1773
- Range Minimum Queries I1336 / 1420
- Range Sum Queries II1315 / 1379
- Range Minimum Queries II1165 / 1197
- Range Xor Queries1220 / 1240
- Range Update Queries938 / 1009
- Forest Queries769 / 786
- Hotel Queries743 / 822
- List Removals587 / 625
- Salary Queries496 / 589
- Subarray Sum Queries397 / 495
- Distinct Values Queries405 / 509
- Forest Queries II337 / 356
- Range Updates and Sums283 / 350
- Polynomial Queries240 / 279
- Range Queries and Copies164 / 172
Tree Algorithms
- Subordinates1118 / 1172
- Tree Matching627 / 761
- Tree Diameter941 / 981
- Tree Distances I650 / 726
- Tree Distances II568 / 587
- Company Queries I560 / 590
- Company Queries II534 / 556
- Distance Queries561 / 594
- Counting Paths384 / 408
- Subtree Queries452 / 468
- Path Queries362 / 381
- Distinct Colors390 / 438
Mathematics
- Exponentiation1631 / 1814
- Exponentiation II1056 / 1380
- Counting Divisors1136 / 1332
- Common Divisors769 / 915
- Sum of Divisors470 / 771
- Binomial Coefficients655 / 763
- Creating Strings II534 / 593
- Distributing Apples504 / 540
- Christmas Party447 / 490
- Fibonacci Numbers577 / 739
- Throwing Dice363 / 399
- Graph Paths I303 / 332
- Graph Paths II240 / 250
- Dice Probability290 / 314
- Moving Robots167 / 178
- Candy Lottery223 / 230
- Inversion Probability207 / 212
- Stick Game289 / 296
- Nim Game I379 / 394
- Nim Game II320 / 328
- Stair Game197 / 241
String Algorithms
- Word Combinations215 / 373
- String Matching438 / 608
- Finding Borders334 / 381
- Finding Periods214 / 257
- Minimal Rotation207 / 284
- Longest Palindrome248 / 318
- Required Substring127 / 222
Additional Problems
- Shortest Subsequence366 / 465
- Counting Bits395 / 487
- Swap Game135 / 181
- Meet in the Middle222 / 279
- Prüfer Code167 / 175
- Edge Directions192 / 206
- Advertisement289 / 307
- Elevator Rides131 / 173
- Maximum Xor Subarray175 / 186
- Movie Festival Queries85 / 100
- Chess Tournament105 / 125
- Tree Traversals107 / 109
- Network Renovation76 / 118
- Graph Girth111 / 121
- Intersection Points101 / 107
- String Reorder76 / 85
- Pyramid Array71 / 91
- Increasing Subsequence II147 / 155
- String Removals132 / 137
- Bit Inversions151 / 162
- Writing Numbers134 / 146
- String Transform74 / 94
- Maximum Building I164 / 168
- Sorting Methods115 / 122
- Cyclic Array73 / 107
- Food Division66 / 80
- Bit Problem80 / 88
- Swap Round Sorting47 / 63
- Tree Isomorphism I88 / 111
- Critical Cities38 / 68
- School Excursion92 / 100
- Coin Grid55 / 71
- Robot Path34 / 68
- Course Schedule II66 / 115
- Empty String83 / 108
- Grid Paths101 / 118
- Book Shop II108 / 122
- Network Breakdown89 / 93
- Visiting Cities90 / 125
- Number Grid141 / 172
- Maximum Building II56 / 67
- Stick Divisions147 / 168
- Coding Company63 / 77
- Flight Route Requests65 / 69
- Tree Isomorphism II69 / 87
- Forbidden Cities56 / 68
- Area of Rectangles75 / 89
- Creating Offices40 / 56
- Permutations II120 / 132
- New Flight Routes32 / 79