General
Introductory Problems
- Weird Algorithm26906 / 28006
- Missing Number22569 / 23973
- Repetitions19869 / 20996
- Increasing Array18357 / 19194
- Permutations16341 / 16954
- Number Spiral11326 / 12371
- Two Knights8446 / 8760
- Two Sets9019 / 9831
- Bit Strings10877 / 11506
- Trailing Zeros10294 / 10969
- Coin Piles8908 / 9888
- Palindrome Reorder7862 / 8461
- Gray Code2112 / 2436
- Tower of Hanoi1822 / 1909
- Creating Strings7342 / 7561
- Apple Division6518 / 7619
- Chessboard and Queens3852 / 3931
- Digit Queries1035 / 1300
- Grid Paths1579 / 2091
Sorting and Searching
- Distinct Numbers11167 / 11582
- Apartments7566 / 8812
- Ferris Wheel7219 / 8055
- Concert Tickets5584 / 6956
- Restaurant Customers5798 / 6386
- Movie Festival5527 / 5905
- Sum of Two Values6540 / 7217
- Maximum Subarray Sum6499 / 6797
- Stick Lengths5905 / 6149
- Missing Coin Sum1688 / 1777
- Collecting Numbers1681 / 1879
- Collecting Numbers II633 / 833
- Playlist4786 / 5606
- Towers4823 / 5230
- Traffic Lights3546 / 4068
- Josephus Problem I874 / 1055
- Josephus Problem II505 / 694
- Nested Ranges Check403 / 504
- Nested Ranges Count346 / 387
- Room Allocation2856 / 3469
- Factory Machines3293 / 3593
- Tasks and Deadlines3228 / 3304
- Reading Books2817 / 3016
- Sum of Three Values3507 / 3980
- Sum of Four Values2531 / 2858
- Nearest Smaller Values3109 / 3278
- Subarray Sums I3811 / 3983
- Subarray Sums II3248 / 3653
- Subarray Divisibility3075 / 3301
- Subarray Distinct Values652 / 701
- Array Division2574 / 2708
- Sliding Median2022 / 2424
- Sliding Cost1426 / 1639
- Movie Festival II1544 / 1930
- Maximum Subarray Sum II1564 / 1881
Dynamic Programming
- Dice Combinations9700 / 10333
- Minimizing Coins8431 / 9008
- Coin Combinations I7806 / 8386
- Coin Combinations II6409 / 7348
- Removing Digits7303 / 7436
- Grid Paths6682 / 6928
- Book Shop5992 / 6641
- Array Description4144 / 4610
- Counting Towers828 / 907
- Edit Distance4518 / 4790
- Rectangle Cutting3949 / 4304
- Money Sums4541 / 4713
- Removal Game3229 / 3595
- Two Sets II3579 / 3899
- Increasing Subsequence3727 / 4291
- Projects2397 / 2742
- Elevator Rides652 / 918
- Counting Tilings309 / 344
- Counting Numbers415 / 460
Graph Algorithms
- Counting Rooms6527 / 6939
- Labyrinth4013 / 4988
- Building Roads5165 / 5412
- Message Route4433 / 4639
- Building Teams4318 / 4527
- Round Trip3425 / 3772
- Monsters1884 / 2430
- Shortest Routes I3416 / 3835
- Shortest Routes II3022 / 3267
- High Score1697 / 2406
- Flight Discount2031 / 2417
- Cycle Finding1694 / 1994
- Flight Routes1421 / 1577
- Round Trip II1692 / 1941
- Course Schedule2252 / 2358
- Longest Flight Route1531 / 1985
- Game Routes1747 / 1849
- Investigation1190 / 1307
- Planets Queries I1218 / 1310
- Planets Queries II546 / 661
- Planets Cycles722 / 817
- Road Reparation1439 / 1483
- Road Construction1383 / 1430
- Flight Routes Check1295 / 1435
- Planets and Kingdoms1135 / 1182
- Giant Pizza599 / 656
- Coin Collector796 / 880
- Mail Delivery696 / 790
- De Bruijn Sequence473 / 494
- Teleporters Path510 / 639
- Hamiltonian Flights574 / 671
- Knight's Tour434 / 499
- Download Speed623 / 703
- Police Chase501 / 537
- School Dance519 / 538
- Distinct Routes343 / 492
Range Queries
- Static Range Sum Queries4184 / 4368
- Static Range Minimum Queries3231 / 3454
- Dynamic Range Sum Queries3208 / 3366
- Dynamic Range Minimum Queries2882 / 2953
- Range Xor Queries3047 / 3103
- Range Update Queries2300 / 2477
- Forest Queries2171 / 2257
- Hotel Queries1733 / 1871
- List Removals1508 / 1607
- Salary Queries1148 / 1375
- Prefix Sum Queries356 / 390
- Pizzeria Queries283 / 295
- Subarray Sum Queries1019 / 1122
- Distinct Values Queries967 / 1152
- Increasing Array Queries159 / 189
- Forest Queries II765 / 810
- Range Updates and Sums728 / 886
- Polynomial Queries598 / 698
- Range Queries and Copies414 / 433
Tree Algorithms
- Subordinates3189 / 3443
- Tree Matching1758 / 2141
- Tree Diameter2661 / 2807
- Tree Distances I1853 / 2050
- Tree Distances II1534 / 1598
- Company Queries I1630 / 1726
- Company Queries II1575 / 1654
- Distance Queries1534 / 1626
- Counting Paths976 / 1036
- Subtree Queries1157 / 1232
- Path Queries963 / 1014
- Path Queries II186 / 227
- Distinct Colors800 / 1011
- Finding a Centroid324 / 335
- Fixed-Length Paths I161 / 184
- Fixed-Length Paths II128 / 139
Mathematics
- Josephus Queries155 / 218
- Exponentiation3829 / 4260
- Exponentiation II2645 / 3357
- Counting Divisors2907 / 3383
- Common Divisors2035 / 2400
- Sum of Divisors1166 / 1908
- Divisor Analysis255 / 364
- Prime Multiples284 / 367
- Counting Coprime Pairs176 / 223
- Binomial Coefficients1513 / 1759
- Creating Strings II1266 / 1385
- Distributing Apples1171 / 1266
- Christmas Party1016 / 1099
- Bracket Sequences I248 / 285
- Bracket Sequences II88 / 114
- Counting Necklaces110 / 122
- Counting Grids92 / 96
- Fibonacci Numbers1294 / 1653
- Throwing Dice791 / 869
- Graph Paths I655 / 705
- Graph Paths II546 / 564
- Dice Probability646 / 693
- Moving Robots348 / 369
- Candy Lottery471 / 486
- Inversion Probability418 / 428
- Stick Game637 / 657
- Nim Game I785 / 817
- Nim Game II645 / 674
- Stair Game432 / 492
- Grundy's Game100 / 140
- Another Game101 / 110
String Algorithms
- Word Combinations567 / 925
- String Matching1200 / 1670
- Finding Borders823 / 957
- Finding Periods511 / 609
- Minimal Rotation394 / 616
- Longest Palindrome500 / 670
- Required Substring251 / 443
- Palindrome Queries84 / 106
- Finding Patterns104 / 141
- Counting Patterns91 / 111
- Pattern Positions85 / 102
- Distinct Substrings82 / 97
- Repeating Substring77 / 84
- String Functions70 / 72
- Substring Order I55 / 57
- Substring Order II38 / 45
- Substring Distribution62 / 67
Geometry
- Point Location Test528 / 586
- Line Segment Intersection310 / 394
- Polygon Area342 / 355
- Point in Polygon184 / 241
- Polygon Lattice Points165 / 175
- Minimum Euclidean Distance129 / 185
- Convex Hull231 / 280
Advanced Techniques
- Meet in the Middle601 / 784
- Hamming Distance184 / 207
- Beautiful Subgrids81 / 122
- Reachable Nodes90 / 105
- Reachability Queries63 / 79
- Cut and Paste70 / 78
- Substring Reversals60 / 65
- Reversals and Sums59 / 62
- Necessary Roads79 / 81
- Necessary Cities70 / 73
- Eulerian Subgraphs38 / 39
- Monster Game I52 / 60
- Monster Game II51 / 54
- Subarray Squares57 / 61
- Houses and Schools35 / 39
- Knuth Division43 / 56
- Apples and Bananas52 / 60
- One Bit Positions48 / 56
- Signal Processing49 / 52
- New Roads Queries59 / 68
- Dynamic Connectivity38 / 41
- Parcel Delivery33 / 38
- Task Assignment33 / 35
- Distinct Routes II30 / 35
Additional Problems
- Shortest Subsequence674 / 910
- Counting Bits704 / 899
- Swap Game261 / 360
- Prüfer Code296 / 314
- Acyclic Graph Edges399 / 425
- Strongly Connected Edges65 / 70
- Even Outdegree Edges50 / 61
- Multiplication Table125 / 137
- Advertisement452 / 478
- Special Substrings53 / 56
- Permutation Inversions48 / 55
- Maximum Xor Subarray367 / 398
- Movie Festival Queries181 / 205
- Chess Tournament202 / 238
- Tree Traversals205 / 210
- Network Renovation162 / 238
- Graph Girth328 / 373
- Intersection Points230 / 254
- Inverse Inversions60 / 63
- Monotone Subsequences32 / 40
- String Reorder148 / 163
- Stack Weights27 / 31
- Pyramid Array133 / 167
- Increasing Subsequence II317 / 342
- String Removals178 / 210
- Bit Inversions334 / 367
- Xor Pyramid83 / 112
- Writing Numbers189 / 207
- String Transform117 / 144
- Letter Pair Move Game10 / 12
- Maximum Building I311 / 319
- Sorting Methods188 / 201
- Cyclic Array123 / 169
- List of Sums30 / 38
- Increasing Array II23 / 32
- Food Division103 / 127
- Bit Problem149 / 163
- Swap Round Sorting77 / 104
- Binary Subsequences12 / 16
- Tree Isomorphism I164 / 199
- Counting Sequences38 / 39
- Critical Cities71 / 110
- School Excursion188 / 203
- Coin Grid107 / 134
- Robot Path55 / 109
- Programmers and Artists19 / 26
- Course Schedule II181 / 269
- Removing Digits II9 / 18
- Coin Arrangement10 / 17
- Counting Bishops17 / 19
- Grid Puzzle I35 / 39
- Grid Puzzle II24 / 27
- Empty String156 / 203
- Grid Paths155 / 201
- Bit Substrings24 / 26
- Reversal Sorting21 / 27
- Counting Reorders10 / 14
- Book Shop II168 / 190
- Network Breakdown158 / 165
- Visiting Cities139 / 186
- Missing Coin Sum Queries11 / 23
- Number Grid210 / 261
- Maximum Building II85 / 106
- Filling Trominos14 / 23
- Stick Divisions350 / 415
- Coding Company149 / 194
- Flight Route Requests101 / 110
- Two Stacks Sorting9 / 25
- Tree Isomorphism II131 / 153
- Forbidden Cities106 / 130
- Area of Rectangles145 / 169
- Grid Completion7 / 10
- Creating Offices68 / 98
- Permutations II180 / 203
- Functional Graph Distribution10 / 11
- New Flight Routes74 / 160
- Grid Path Construction8 / 13