General
Introductory Problems
- Weird Algorithm162278 / 169746
- Missing Number140074 / 146681
- Repetitions121815 / 126590
- Increasing Array114667 / 118644
- Permutations100719 / 103708
- Number Spiral71259 / 77511
- Two Knights54652 / 56344
- Two Sets59473 / 63857
- Bit Strings68029 / 71731
- Trailing Zeros63123 / 67063
- Coin Piles55964 / 61095
- Palindrome Reorder52063 / 54902
- Gray Code35139 / 39365
- Tower of Hanoi32645 / 33932
- Creating Strings43906 / 45017
- Apple Division44196 / 49812
- Chessboard and Queens26733 / 27206
- Raab Game I5567 / 6323
- Mex Grid Construction5404 / 5712
- Knight Moves Grid5431 / 5551
- Grid Coloring I4540 / 4701
- Digit Queries18839 / 21798
- String Reorder4128 / 4781
- Grid Path Description10459 / 13539
Sorting and Searching
- Distinct Numbers80224 / 86589
- Apartments59883 / 66236
- Ferris Wheel57465 / 61811
- Concert Tickets46104 / 53501
- Restaurant Customers46908 / 50536
- Movie Festival45327 / 47938
- Sum of Two Values52764 / 58923
- Maximum Subarray Sum50737 / 52936
- Stick Lengths45355 / 47401
- Missing Coin Sum34333 / 35568
- Collecting Numbers35204 / 37603
- Collecting Numbers II14941 / 18940
- Playlist35130 / 40012
- Towers35234 / 37707
- Traffic Lights27363 / 30555
- Distinct Values Subarrays7481 / 8674
- Distinct Values Subsequences5720 / 6320
- Josephus Problem I21001 / 23080
- Josephus Problem II11423 / 15702
- Nested Ranges Check12298 / 14061
- Nested Ranges Count8263 / 9726
- Room Allocation20604 / 23581
- Factory Machines29678 / 32236
- Tasks and Deadlines23738 / 24235
- Reading Books19207 / 20569
- Sum of Three Values28054 / 31001
- Sum of Four Values17435 / 19354
- Nearest Smaller Values23407 / 24200
- Subarray Sums I31067 / 33076
- Subarray Sums II28241 / 33391
- Subarray Divisibility25584 / 27824
- Distinct Values Subarrays II15491 / 16964
- Array Division24254 / 25506
- Movie Festival II13010 / 15666
- Maximum Subarray Sum II12090 / 14387
Dynamic Programming
- Dice Combinations83480 / 88230
- Minimizing Coins72184 / 77454
- Coin Combinations I65989 / 71282
- Coin Combinations II55841 / 63005
- Removing Digits62107 / 63341
- Grid Paths I58411 / 60031
- Book Shop52312 / 57396
- Array Description38549 / 42714
- Counting Towers23563 / 24956
- Edit Distance38622 / 40745
- Longest Common Subsequence10801 / 11201
- Rectangle Cutting31854 / 34742
- Minimal Grid Path4757 / 8419
- Money Sums37671 / 39076
- Removal Game22718 / 30096
- Two Sets II29625 / 31825
- Mountain Range3297 / 5968
- Increasing Subsequence30288 / 33976
- Projects20996 / 23424
- Elevator Rides13479 / 16883
- Counting Tilings7910 / 8603
- Counting Numbers11233 / 12597
- Increasing Subsequence II4903 / 5708
Graph Algorithms
- Counting Rooms57665 / 60520
- Labyrinth40168 / 47846
- Building Roads50237 / 52039
- Message Route43305 / 45000
- Building Teams40898 / 43064
- Round Trip32360 / 35183
- Monsters22412 / 26267
- Shortest Routes I35602 / 39147
- Shortest Routes II28818 / 32236
- High Score17761 / 24733
- Flight Discount22917 / 26706
- Cycle Finding16212 / 19756
- Flight Routes15726 / 17531
- Round Trip II17806 / 19950
- Course Schedule23629 / 24912
- Longest Flight Route16848 / 20699
- Game Routes18688 / 19962
- Investigation13867 / 14876
- Planets Queries I12064 / 14102
- Planets Queries II4382 / 5525
- Planets Cycles7368 / 8207
- Road Reparation18307 / 19077
- Road Construction20092 / 20735
- Flight Routes Check15994 / 17306
- Planets and Kingdoms12848 / 13361
- Giant Pizza5376 / 5904
- Coin Collector8438 / 9307
- Mail Delivery6932 / 7573
- De Bruijn Sequence3669 / 3837
- Teleporters Path5314 / 6048
- Hamiltonian Flights8037 / 9142
- Knight's Tour3044 / 3676
- Download Speed5323 / 7078
- Police Chase4259 / 4766
- School Dance4672 / 4934
- Distinct Routes3299 / 4294
Range Queries
- Static Range Sum Queries40290 / 42069
- Static Range Minimum Queries27992 / 29966
- Dynamic Range Sum Queries29057 / 30332
- Dynamic Range Minimum Queries26303 / 26931
- Range Xor Queries27053 / 27408
- Range Update Queries21590 / 23125
- Forest Queries22139 / 22933
- Hotel Queries15686 / 16611
- List Removals13003 / 13653
- Salary Queries9843 / 12353
- Prefix Sum Queries8379 / 9045
- Pizzeria Queries6739 / 6981
- Visible Buildings Queries1744 / 1905
- Range Interval Queries1353 / 1817
- Subarray Sum Queries7886 / 8537
- Subarray Sum Queries II1940 / 2006
- Distinct Values Queries7404 / 9073
- Distinct Values Queries II1134 / 1289
- Increasing Array Queries2844 / 3251
- Movie Festival Queries1501 / 1665
- Forest Queries II4698 / 5047
- Range Updates and Sums6426 / 7595
- Polynomial Queries4754 / 5585
- Range Queries and Copies3370 / 3599
- Missing Coin Sum Queries778 / 1014
Tree Algorithms
- Subordinates32974 / 35280
- Tree Matching18782 / 21775
- Tree Diameter26867 / 28460
- Tree Distances I20630 / 22151
- Tree Distances II16834 / 17613
- Company Queries I18776 / 19757
- Company Queries II17579 / 18505
- Distance Queries15898 / 17058
- Counting Paths10004 / 10588
- Subtree Queries11995 / 12771
- Path Queries9646 / 10211
- Path Queries II4017 / 5980
- Distinct Colors9268 / 10197
- Finding a Centroid7488 / 7789
- Fixed-Length Paths I3675 / 4690
- Fixed-Length Paths II1744 / 3132
Mathematics
- Josephus Queries5193 / 6542
- Exponentiation26159 / 27896
- Exponentiation II18322 / 21855
- Counting Divisors23859 / 26908
- Common Divisors15425 / 17847
- Sum of Divisors8672 / 12875
- Divisor Analysis5948 / 7936
- Prime Multiples6891 / 8024
- Counting Coprime Pairs4560 / 5276
- Next Prime2104 / 2413
- Binomial Coefficients11097 / 12285
- Creating Strings II9273 / 9778
- Distributing Apples8841 / 9498
- Christmas Party7264 / 7772
- Permutation Order1009 / 1031
- Permutation Rounds1388 / 1547
- Bracket Sequences I4926 / 5360
- Bracket Sequences II2605 / 2974
- Counting Necklaces2380 / 2574
- Counting Grids1979 / 2103
- Fibonacci Numbers7424 / 9288
- Throwing Dice3879 / 4214
- Graph Paths I3738 / 3999
- Graph Paths II3124 / 3271
- System of Linear Equations507 / 554
- Sum of Four Squares737 / 866
- Triangle Number Sums632 / 767
- Dice Probability3326 / 3582
- Moving Robots1730 / 1827
- Candy Lottery1652 / 3265
- Inversion Probability462 / 2427
- Stick Game3782 / 3873
- Nim Game I5024 / 5207
- Nim Game II3974 / 4131
- Stair Game2712 / 2942
- Grundy's Game1890 / 2474
- Another Game2126 / 2288
String Algorithms
- Word Combinations6383 / 9173
- String Matching12325 / 16424
- Finding Borders9040 / 9872
- Finding Periods6411 / 7255
- Minimal Rotation3117 / 4697
- Longest Palindrome4692 / 6176
- All Palindromes682 / 775
- Required Substring1802 / 2716
- Palindrome Queries2204 / 2570
- Finding Patterns2070 / 2915
- Counting Patterns1958 / 2420
- Pattern Positions1651 / 2004
- Distinct Substrings1861 / 2216
- Distinct Subsequences1164 / 1238
- Repeating Substring2007 / 2327
- String Functions1757 / 1843
- Inverse Suffix Array255 / 301
- String Transform572 / 692
- Substring Order I1265 / 1409
- Substring Order II837 / 1088
- Substring Distribution1174 / 1274
Geometry
- Point Location Test7904 / 8800
- Line Segment Intersection4688 / 5865
- Polygon Area5407 / 5714
- Point in Polygon2977 / 3784
- Polygon Lattice Points2509 / 2592
- Minimum Euclidean Distance2155 / 3056
- Convex Hull3634 / 4333
- Maximum Manhattan Distances644 / 667
- All Manhattan Distances635 / 693
- Intersection Points2126 / 2290
- Line Segments Trace I344 / 358
- Line Segments Trace II284 / 301
- Lines and Queries I398 / 416
- Lines and Queries II342 / 354
- Area of Rectangles1226 / 1371
- Robot Path330 / 611
Advanced Techniques
- Meet in the Middle7174 / 9871
- Hamming Distance3406 / 3724
- Corner Subgrid Check357 / 549
- Corner Subgrid Count2348 / 2636
- Reachable Nodes2422 / 2602
- Reachability Queries1619 / 1904
- Cut and Paste1645 / 1823
- Substring Reversals1432 / 1553
- Reversals and Sums1454 / 1559
- Necessary Roads2111 / 2168
- Necessary Cities1949 / 2039
- Eulerian Subgraphs852 / 896
- Monster Game I1236 / 1374
- Monster Game II1095 / 1172
- Subarray Squares1545 / 1809
- Houses and Schools827 / 989
- Knuth Division1014 / 1144
- Apples and Bananas1157 / 1254
- One Bit Positions904 / 985
- Signal Processing866 / 927
- New Roads Queries2357 / 2846
- Dynamic Connectivity1079 / 1216
- Parcel Delivery828 / 912
- Task Assignment960 / 1034
- Distinct Routes II625 / 712
Sliding Window Problems
- Sliding Window Sum5935 / 6152
- Sliding Window Minimum4436 / 5073
- Sliding Window Xor4336 / 4395
- Sliding Window Or1914 / 3278
- Sliding Window Distinct Values2958 / 3619
- Sliding Window Mode2402 / 2552
- Sliding Window Mex2216 / 2339
- Sliding Window Median14282 / 16300
- Sliding Window Cost9355 / 10785
- Sliding Window Inversions1240 / 1316
- Sliding Window Advertisement235 / 376
Interactive Problems
- Hidden Integer2339 / 2434
- Hidden Permutation997 / 1166
- K-th Highest Score437 / 530
- Permuted Binary Strings547 / 561
- Colored Chairs494 / 521
- Inversion Sorting284 / 317
Bitwise Operations
- Counting Bits5323 / 6878
- Maximum Xor Subarray3171 / 3618
- Maximum Xor Subset1047 / 1142
- Number of Subset Xors928 / 947
- K Subset Xors465 / 552
- All Subarray Xors283 / 467
- Xor Pyramid Peak2151 / 2603
- Xor Pyramid Diagonal331 / 370
- Xor Pyramid Row282 / 333
- SOS Bit Problem2258 / 2399
- And Subset Count444 / 462
Construction Problems
- Inverse Inversions1759 / 1873
- Monotone Subsequences1059 / 1250
- Third Permutation424 / 513
- Permutation Prime Sums429 / 464
- Chess Tournament1254 / 1450
- Distinct Sums Grid135 / 211
- Filling Trominos244 / 440
- Grid Path Construction123 / 440
Advanced Graph Problems
- Nearest Shops731 / 945
- Prüfer Code1592 / 1710
- Tree Traversals1291 / 1422
- Course Schedule II2009 / 2874
- Acyclic Graph Edges2290 / 2427
- Strongly Connected Edges1563 / 1845
- Even Outdegree Edges1424 / 1661
- Graph Girth3560 / 4045
- Fixed Length Walk Queries365 / 406
- Transfer Speeds Sum424 / 438
- MST Edge Check650 / 707
- MST Edge Set Check244 / 277
- MST Edge Cost395 / 412
- Network Breakdown1204 / 1313
- Tree Coin Collecting I347 / 379
- Tree Coin Collecting II188 / 220
- Tree Isomorphism I1131 / 1347
- Tree Isomorphism II929 / 1073
- Flight Route Requests516 / 636
- Critical Cities437 / 674
- Visiting Cities700 / 924
- Graph Coloring231 / 271
- Bus Companies272 / 280
- Split into Two Paths97 / 175
- Network Renovation964 / 1280
- Forbidden Cities873 / 1138
- Creating Offices430 / 561
- New Flight Routes341 / 918
Counting Problems
- Filled Subgrid Count I591 / 664
- Filled Subgrid Count II318 / 390
- All Letter Subgrid Count I174 / 265
- All Letter Subgrid Count II141 / 179
- Border Subgrid Count I93 / 165
- Border Subgrid Count II101 / 118
- Raab Game II107 / 123
- Empty String1730 / 2106
- Permutation Inversions1063 / 1172
- Counting Bishops407 / 454
- Counting Sequences676 / 730
- Grid Paths II782 / 980
- Counting Permutations918 / 1036
- Grid Completion231 / 292
- Counting Reorders250 / 359
- Tournament Graph Distribution107 / 114
- Collecting Numbers Distribution113 / 121
- Functional Graph Distribution252 / 310
Additional Problems I
- Shortest Subsequence3073 / 4048
- Distinct Values Sum673 / 696
- Distinct Values Splits489 / 518
- Swap Game2088 / 2687
- Beautiful Permutation II544 / 828
- Multiplication Table7065 / 7866
- Bubble Sort Rounds I407 / 467
- Bubble Sort Rounds II268 / 304
- Nearest Campsites I181 / 211
- Nearest Campsites II177 / 189
- Advertisement4521 / 4790
- Special Substrings1006 / 1105
- Counting LCM Arrays275 / 301
- Square Subsets224 / 249
- Subarray Sum Constraints401 / 427
- Water Containers Moves173 / 183
- Water Containers Queries209 / 219
- Stack Weights600 / 716
- Maximum Average Subarrays170 / 187
- Subsets with Fixed Average213 / 231
- Two Array Average209 / 234
- Pyramid Array774 / 937
- Permutation Subsequence250 / 258
- Bit Inversions2386 / 2699
- Writing Numbers755 / 815
- Letter Pair Move Game208 / 288
- Maximum Building I2136 / 2228
- Sorting Methods790 / 844
- Cyclic Array1235 / 1405
- List of Sums501 / 650
Additional Problems II
- Bouncing Ball Steps234 / 257
- Bouncing Ball Cycle90 / 128
- Knight Moves Queries119 / 142
- K Subset Sums I189 / 244
- K Subset Sums II107 / 140
- Increasing Array II816 / 932
- Food Division529 / 637
- Swap Round Sorting422 / 520
- Binary Subsequences297 / 432
- School Excursion1415 / 1499
- Coin Grid910 / 1063
- Grid Coloring II138 / 179
- Programmers and Artists514 / 718
- Removing Digits II218 / 475
- Coin Arrangement341 / 454
- Replace with Difference129 / 154
- Grid Puzzle I552 / 607
- Grid Puzzle II528 / 581
- Bit Substrings407 / 493
- Reversal Sorting361 / 437
- Book Shop II1269 / 1445
- GCD Subsets415 / 427
- Minimum Cost Pairs142 / 186
- Same Sum Subsets115 / 218
- Mex Grid Queries867 / 1015
- Maximum Building II457 / 563
- Stick Divisions3901 / 4569
- Stick Difference60 / 253
- Coding Company1542 / 2016
- Two Stacks Sorting182 / 586