General
Introductory Problems
- Weird Algorithm24659 / 25664
- Missing Number20602 / 21910
- Repetitions18155 / 19194
- Increasing Array16787 / 17548
- Permutations14904 / 15468
- Number Spiral10336 / 11288
- Two Knights7737 / 8024
- Two Sets8199 / 8936
- Bit Strings9903 / 10475
- Trailing Zeros9342 / 9949
- Coin Piles8123 / 9015
- Palindrome Reorder7143 / 7701
- Gray Code1481 / 1717
- Tower of Hanoi1274 / 1340
- Creating Strings6770 / 6970
- Apple Division5947 / 6951
- Chessboard and Queens3529 / 3604
- Digit Queries728 / 914
- Grid Paths1461 / 1928
Sorting and Searching
- Distinct Numbers10110 / 10480
- Apartments6804 / 7957
- Ferris Wheel6512 / 7265
- Concert Tickets5014 / 6308
- Restaurant Customers5232 / 5759
- Movie Festival4973 / 5311
- Sum of Two Values5876 / 6469
- Maximum Subarray Sum5844 / 6100
- Stick Lengths5330 / 5566
- Missing Coin Sum1114 / 1176
- Collecting Numbers1097 / 1253
- Collecting Numbers II420 / 554
- Playlist4357 / 5119
- Towers4385 / 4761
- Traffic Lights3209 / 3691
- Josephus Problem I575 / 692
- Josephus Problem II310 / 442
- Nested Ranges Check263 / 326
- Nested Ranges Count231 / 255
- Room Allocation2612 / 3180
- Factory Machines2990 / 3266
- Tasks and Deadlines2937 / 3006
- Reading Books2579 / 2762
- Sum of Three Values3144 / 3577
- Sum of Four Values2308 / 2614
- Nearest Smaller Values2839 / 3004
- Subarray Sums I3442 / 3606
- Subarray Sums II2923 / 3298
- Subarray Divisibility2782 / 2978
- Subarray Distinct Values427 / 466
- Array Division2369 / 2497
- Sliding Median1856 / 2230
- Sliding Cost1319 / 1524
- Movie Festival II1403 / 1761
- Maximum Subarray Sum II1425 / 1713
Dynamic Programming
- Dice Combinations8766 / 9327
- Minimizing Coins7606 / 8131
- Coin Combinations I7038 / 7560
- Coin Combinations II5731 / 6585
- Removing Digits6560 / 6685
- Grid Paths5993 / 6221
- Book Shop5403 / 6005
- Array Description3699 / 4130
- Counting Towers544 / 596
- Edit Distance4076 / 4327
- Rectangle Cutting3564 / 3884
- Money Sums4101 / 4256
- Removal Game2915 / 3262
- Two Sets II3243 / 3531
- Increasing Subsequence3397 / 3908
- Projects2189 / 2500
- Elevator Rides520 / 743
- Counting Tilings205 / 230
- Counting Numbers279 / 312
Graph Algorithms
- Counting Rooms5844 / 6217
- Labyrinth3579 / 4467
- Building Roads4591 / 4807
- Message Route3985 / 4174
- Building Teams3889 / 4085
- Round Trip3070 / 3394
- Monsters1683 / 2188
- Shortest Routes I3047 / 3433
- Shortest Routes II2705 / 2930
- High Score1485 / 2152
- Flight Discount1823 / 2181
- Cycle Finding1504 / 1787
- Flight Routes1262 / 1404
- Round Trip II1505 / 1745
- Course Schedule1997 / 2087
- Longest Flight Route1349 / 1769
- Game Routes1566 / 1655
- Investigation1068 / 1174
- Planets Queries I1082 / 1161
- Planets Queries II500 / 606
- Planets Cycles657 / 739
- Road Reparation1264 / 1301
- Road Construction1207 / 1246
- Flight Routes Check1120 / 1242
- Planets and Kingdoms1007 / 1045
- Giant Pizza549 / 595
- Coin Collector705 / 783
- Mail Delivery617 / 706
- De Bruijn Sequence434 / 454
- Teleporters Path448 / 567
- Hamiltonian Flights506 / 600
- Knight's Tour403 / 462
- Download Speed554 / 629
- Police Chase456 / 492
- School Dance467 / 485
- Distinct Routes310 / 453
Range Queries
- Static Range Sum Queries3826 / 3998
- Static Range Minimum Queries2963 / 3168
- Dynamic Range Sum Queries2938 / 3076
- Dynamic Range Minimum Queries2644 / 2710
- Range Xor Queries2774 / 2826
- Range Update Queries2100 / 2257
- Forest Queries1942 / 2007
- Hotel Queries1580 / 1709
- List Removals1373 / 1462
- Salary Queries1069 / 1269
- Prefix Sum Queries257 / 281
- Pizzeria Queries201 / 212
- Subarray Sum Queries936 / 1038
- Distinct Values Queries891 / 1054
- Increasing Array Queries115 / 139
- Forest Queries II709 / 750
- Range Updates and Sums662 / 799
- Polynomial Queries557 / 649
- Range Queries and Copies377 / 395
Tree Algorithms
- Subordinates2839 / 3072
- Tree Matching1581 / 1931
- Tree Diameter2389 / 2525
- Tree Distances I1660 / 1837
- Tree Distances II1368 / 1428
- Company Queries I1440 / 1530
- Company Queries II1395 / 1465
- Distance Queries1366 / 1451
- Counting Paths875 / 929
- Subtree Queries1027 / 1092
- Path Queries861 / 906
- Path Queries II115 / 138
- Distinct Colors728 / 933
- Finding a Centroid228 / 233
- Fixed-Length Paths I101 / 114
- Fixed-Length Paths II82 / 90
Mathematics
- Josephus Queries99 / 144
- Exponentiation3554 / 3959
- Exponentiation II2455 / 3123
- Counting Divisors2678 / 3119
- Common Divisors1852 / 2201
- Sum of Divisors1052 / 1733
- Divisor Analysis172 / 249
- Prime Multiples201 / 268
- Counting Coprime Pairs126 / 158
- Binomial Coefficients1427 / 1658
- Creating Strings II1187 / 1305
- Distributing Apples1101 / 1187
- Christmas Party951 / 1031
- Bracket Sequences I169 / 193
- Bracket Sequences II63 / 80
- Counting Necklaces77 / 83
- Counting Grids64 / 68
- Fibonacci Numbers1200 / 1526
- Throwing Dice737 / 812
- Graph Paths I605 / 656
- Graph Paths II505 / 526
- Dice Probability598 / 645
- Moving Robots321 / 341
- Candy Lottery438 / 453
- Inversion Probability396 / 405
- Stick Game585 / 603
- Nim Game I727 / 757
- Nim Game II598 / 627
- Stair Game393 / 453
- Grundy's Game68 / 97
- Another Game75 / 82
String Algorithms
- Word Combinations506 / 829
- String Matching1041 / 1464
- Finding Borders728 / 849
- Finding Periods456 / 544
- Minimal Rotation359 / 565
- Longest Palindrome456 / 614
- Required Substring240 / 415
- Palindrome Queries59 / 65
- Finding Patterns77 / 98
- Counting Patterns65 / 77
- Pattern Positions62 / 67
- Distinct Substrings62 / 70
- Repeating Substring59 / 64
- String Functions52 / 54
- Substring Order I42 / 43
- Substring Order II30 / 35
- Substring Distribution47 / 51
Geometry
- Point Location Test395 / 440
- Line Segment Intersection211 / 272
- Polygon Area240 / 253
- Point in Polygon129 / 161
- Polygon Lattice Points118 / 124
- Minimum Euclidean Distance87 / 138
- Convex Hull159 / 194
Advanced Techniques
- Meet in the Middle530 / 698
- Hamming Distance133 / 151
- Beautiful Subgrids62 / 91
- Reachable Nodes69 / 78
- Reachability Queries51 / 61
- Cut and Paste46 / 53
- Substring Reversals41 / 45
- Reversals and Sums41 / 43
- Necessary Roads55 / 57
- Necessary Cities49 / 53
- Eulerian Subgraphs28 / 30
- Monster Game I37 / 40
- Monster Game II38 / 40
- Subarray Squares44 / 47
- Houses and Schools25 / 28
- Knuth Division32 / 43
- Apples and Bananas42 / 51
- One Bit Positions41 / 48
- Signal Processing38 / 40
- New Roads Queries46 / 53
- Dynamic Connectivity28 / 30
- Parcel Delivery28 / 33
- Task Assignment27 / 29
- Distinct Routes II24 / 27
Additional Problems
- Shortest Subsequence628 / 850
- Counting Bits668 / 850
- Swap Game243 / 337
- Prüfer Code280 / 297
- Acyclic Graph Edges370 / 396
- Strongly Connected Edges43 / 46
- Even Outdegree Edges33 / 38
- Multiplication Table82 / 90
- Advertisement433 / 457
- Special Substrings43 / 44
- Permutation Inversions33 / 39
- Maximum Xor Subarray346 / 376
- Movie Festival Queries171 / 194
- Chess Tournament193 / 228
- Tree Traversals195 / 200
- Network Renovation154 / 225
- Graph Girth300 / 339
- Intersection Points203 / 221
- Inverse Inversions46 / 48
- Monotone Subsequences27 / 35
- String Reorder139 / 154
- Stack Weights20 / 23
- Pyramid Array128 / 158
- Increasing Subsequence II291 / 314
- String Removals166 / 202
- Bit Inversions309 / 340
- Xor Pyramid57 / 77
- Writing Numbers182 / 200
- String Transform115 / 142
- Letter Pair Move Game9 / 11
- Maximum Building I288 / 295
- Sorting Methods178 / 189
- Cyclic Array119 / 164
- List of Sums22 / 26
- Increasing Array II20 / 29
- Food Division102 / 124
- Bit Problem138 / 152
- Swap Round Sorting75 / 102
- Binary Subsequences11 / 15
- Tree Isomorphism I154 / 188
- Counting Sequences28 / 29
- Critical Cities70 / 105
- School Excursion173 / 187
- Coin Grid97 / 123
- Robot Path54 / 106
- Programmers and Artists16 / 22
- Course Schedule II163 / 244
- Removing Digits II9 / 15
- Coin Arrangement10 / 16
- Counting Bishops14 / 16
- Grid Puzzle I28 / 31
- Grid Puzzle II19 / 21
- Empty String141 / 184
- Grid Paths153 / 197
- Bit Substrings21 / 22
- Reversal Sorting19 / 23
- Counting Reorders9 / 12
- Book Shop II160 / 183
- Network Breakdown152 / 159
- Visiting Cities131 / 176
- Missing Coin Sum Queries11 / 20
- Number Grid201 / 250
- Maximum Building II82 / 100
- Filling Trominos13 / 20
- Stick Divisions315 / 375
- Coding Company127 / 167
- Flight Route Requests94 / 103
- Two Stacks Sorting9 / 22
- Tree Isomorphism II122 / 144
- Forbidden Cities95 / 119
- Area of Rectangles137 / 158
- Grid Completion7 / 10
- Creating Offices64 / 92
- Permutations II172 / 194
- Functional Graph Distribution9 / 10
- New Flight Routes69 / 148
- Grid Path Construction7 / 11