General
Introductory Problems
- Weird Algorithm10140 / 10560
- Missing Number8256 / 8856
- Repetitions7242 / 7683
- Increasing Array6652 / 6945
- Permutations5871 / 6079
- Number Spiral4019 / 4390
- Two Knights2944 / 3077
- Two Sets3146 / 3403
- Bit Strings3767 / 3973
- Trailing Zeros3538 / 3777
- Coin Piles3036 / 3383
- Palindrome Reorder2671 / 2887
- Creating Strings I2572 / 2633
- Apple Division2180 / 2568
- Chessboard and Queens1310 / 1339
- Grid Paths541 / 731
Sorting and Searching
- Distinct Numbers3688 / 3810
- Apartments2403 / 2862
- Ferris Wheel2335 / 2647
- Concert Tickets1719 / 2198
- Restaurant Customers1731 / 1899
- Movie Festival1661 / 1755
- Sum of Two Values1956 / 2132
- Maximum Subarray Sum1963 / 2066
- Stick Lengths1854 / 1943
- Playlist1609 / 1932
- Towers1570 / 1705
- Traffic Lights1118 / 1278
- Room Allocation961 / 1143
- Factory Machines1047 / 1163
- Tasks and Deadlines1034 / 1048
- Reading Books918 / 1000
- Sum of Three Values1139 / 1253
- Sum of Four Values892 / 978
- Nearest Smaller Values998 / 1071
- Subarray Sums I1171 / 1243
- Subarray Sums II951 / 1111
- Subarray Divisibility960 / 1018
- Array Division845 / 917
- Sliding Median722 / 839
- Sliding Cost524 / 585
- Movie Festival II472 / 592
- Maximum Subarray Sum II509 / 616
Dynamic Programming
- Dice Combinations2872 / 3040
- Minimizing Coins2526 / 2688
- Coin Combinations I2282 / 2422
- Coin Combinations II1800 / 2087
- Removing Digits2155 / 2199
- Grid Paths1917 / 1999
- Book Shop1752 / 1922
- Array Description1146 / 1278
- Edit Distance1270 / 1345
- Rectangle Cutting1130 / 1242
- Money Sums1314 / 1363
- Removal Game1040 / 1119
- Two Sets II1040 / 1158
- Increasing Subsequence1185 / 1353
- Projects757 / 866
Graph Algorithms
- Counting Rooms1838 / 1970
- Labyrinth1112 / 1410
- Building Roads1343 / 1398
- Message Route1181 / 1248
- Building Teams1123 / 1189
- Round Trip868 / 1000
- Monsters494 / 674
- Shortest Routes I854 / 977
- Shortest Routes II799 / 864
- High Score426 / 634
- Flight Discount516 / 642
- Cycle Finding456 / 535
- Flight Routes371 / 416
- Round Trip II388 / 454
- Course Schedule509 / 545
- Longest Flight Route387 / 480
- Game Routes416 / 446
- Investigation307 / 334
- Planets Queries I327 / 354
- Planets Queries II185 / 222
- Planets Cycles208 / 224
- Road Reparation358 / 370
- Road Construction338 / 342
- Flight Routes Check269 / 284
- Planets and Kingdoms300 / 308
- Giant Pizza179 / 199
- Coin Collector211 / 236
- Mail Delivery165 / 209
- De Bruijn Sequence154 / 160
- Teleporters Path147 / 181
- Hamiltonian Flights152 / 191
- Knight's Tour148 / 169
- Download Speed163 / 174
- Police Chase148 / 158
- School Dance167 / 176
- Distinct Routes118 / 159
Range Queries
- Range Sum Queries I1389 / 1452
- Range Minimum Queries I1089 / 1159
- Range Sum Queries II1082 / 1131
- Range Minimum Queries II939 / 961
- Range Xor Queries969 / 984
- Range Update Queries784 / 832
- Forest Queries610 / 620
- Hotel Queries616 / 684
- List Removals480 / 515
- Salary Queries428 / 502
- Subarray Sum Queries295 / 410
- Distinct Values Queries337 / 419
- Forest Queries II283 / 302
- Range Updates and Sums239 / 295
- Polynomial Queries211 / 244
- Range Queries and Copies143 / 148
Tree Algorithms
- Subordinates855 / 899
- Tree Matching492 / 592
- Tree Diameter733 / 763
- Tree Distances I501 / 561
- Tree Distances II451 / 467
- Company Queries I438 / 455
- Company Queries II417 / 436
- Distance Queries456 / 484
- Counting Paths319 / 338
- Subtree Queries377 / 388
- Path Queries307 / 320
- Distinct Colors334 / 374
Mathematics
- Exponentiation1364 / 1506
- Exponentiation II861 / 1138
- Counting Divisors919 / 1082
- Common Divisors632 / 751
- Sum of Divisors394 / 637
- Binomial Coefficients552 / 646
- Creating Strings II444 / 498
- Distributing Apples422 / 449
- Christmas Party368 / 405
- Fibonacci Numbers474 / 607
- Throwing Dice296 / 323
- Graph Paths I239 / 265
- Graph Paths II190 / 198
- Dice Probability232 / 252
- Moving Robots136 / 148
- Candy Lottery180 / 188
- Inversion Probability172 / 177
- Stick Game236 / 241
- Nim Game I310 / 324
- Nim Game II263 / 270
- Stair Game160 / 196
String Algorithms
- Word Combinations181 / 303
- String Matching362 / 499
- Finding Borders293 / 332
- Finding Periods186 / 224
- Minimal Rotation183 / 256
- Longest Palindrome217 / 277
- Required Substring107 / 196
Additional Problems
- Shortest Subsequence328 / 416
- Counting Bits345 / 421
- Swap Game102 / 140
- Meet in the Middle197 / 249
- Prüfer Code149 / 158
- Edge Directions156 / 169
- Advertisement255 / 272
- Elevator Rides113 / 151
- Maximum Xor Subarray143 / 152
- Movie Festival Queries69 / 82
- Chess Tournament90 / 105
- Tree Traversals88 / 90
- Network Renovation62 / 101
- Graph Girth88 / 98
- Intersection Points86 / 92
- String Reorder63 / 71
- Pyramid Array60 / 80
- Increasing Subsequence II121 / 129
- String Removals118 / 123
- Bit Inversions131 / 141
- Writing Numbers124 / 136
- String Transform63 / 81
- Maximum Building I140 / 144
- Sorting Methods100 / 105
- Cyclic Array65 / 100
- Food Division58 / 74
- Bit Problem63 / 71
- Swap Round Sorting38 / 53
- Tree Isomorphism I66 / 76
- Critical Cities28 / 63
- School Excursion80 / 87
- Coin Grid48 / 62
- Robot Path21 / 46
- Course Schedule II57 / 96
- Empty String70 / 95
- Grid Paths92 / 106
- Book Shop II99 / 113
- Network Breakdown79 / 83
- Visiting Cities77 / 106
- Number Grid134 / 161
- Maximum Building II48 / 59
- Stick Divisions129 / 147
- Coding Company51 / 65
- Flight Route Requests55 / 59
- Tree Isomorphism II61 / 74
- Forbidden Cities49 / 58
- Area of Rectangles62 / 75
- Creating Offices31 / 45
- Permutations II101 / 111
- New Flight Routes25 / 64