General
Introductory Problems
- Weird Algorithm5845 / 6079
- Missing Number4500 / 4874
- Repetitions3905 / 4168
- Increasing Array3573 / 3752
- Permutations3125 / 3249
- Number Spiral2170 / 2354
- Two Knights1560 / 1643
- Two Sets1665 / 1790
- Bit Strings1949 / 2062
- Trailing Zeros1813 / 1934
- Coin Piles1515 / 1706
- Palindrome Reorder1354 / 1457
- Creating Strings I1302 / 1338
- Apple Division1124 / 1312
- Chessboard and Queens690 / 707
- Grid Paths325 / 431
Sorting and Searching
- Distinct Numbers1979 / 2038
- Apartments1371 / 1600
- Ferris Wheel1320 / 1469
- Concert Tickets999 / 1226
- Restaurant Customers969 / 1049
- Movie Festival922 / 972
- Sum of Two Values1060 / 1148
- Maximum Subarray Sum1106 / 1142
- Stick Lengths1055 / 1109
- Playlist922 / 1133
- Towers919 / 993
- Traffic Lights598 / 681
- Room Allocation542 / 633
- Factory Machines554 / 645
- Tasks and Deadlines557 / 565
- Reading Books491 / 535
- Sum of Three Values612 / 686
- Sum of Four Values492 / 526
- Nearest Smaller Values533 / 588
- Subarray Sums I659 / 675
- Subarray Sums II507 / 591
- Subarray Divisibility495 / 531
- Array Division484 / 527
- Sliding Median432 / 497
- Sliding Cost315 / 348
- Movie Festival II275 / 355
- Maximum Subarray Sum II311 / 355
Dynamic Programming
- Dice Combinations1852 / 1970
- Minimizing Coins1635 / 1742
- Coin Combinations I1496 / 1571
- Coin Combinations II1178 / 1366
- Removing Digits1405 / 1432
- Grid Paths1241 / 1308
- Book Shop1168 / 1289
- Array Description729 / 829
- Edit Distance812 / 865
- Rectangle Cutting737 / 824
- Money Sums835 / 868
- Removal Game701 / 747
- Two Sets II698 / 771
- Increasing Subsequence789 / 905
- Projects499 / 581
Graph Algorithms
- Counting Rooms1138 / 1214
- Labyrinth714 / 874
- Building Roads819 / 859
- Message Route715 / 759
- Building Teams684 / 723
- Round Trip530 / 607
- Monsters313 / 433
- Shortest Routes I511 / 597
- Shortest Routes II507 / 546
- High Score301 / 402
- Flight Discount328 / 415
- Cycle Finding293 / 350
- Flight Routes233 / 260
- Round Trip II227 / 280
- Course Schedule332 / 355
- Longest Flight Route236 / 312
- Game Routes266 / 285
- Investigation207 / 226
- Planets Queries I211 / 228
- Planets Queries II124 / 152
- Planets Cycles132 / 141
- Road Reparation238 / 244
- Road Construction229 / 230
- Flight Routes Check178 / 189
- Planets and Kingdoms207 / 212
- Giant Pizza130 / 140
- Coin Collector135 / 152
- Mail Delivery127 / 137
- De Bruijn Sequence106 / 109
- Teleporters Path114 / 122
- Hamiltonian Flights95 / 128
- Knight's Tour100 / 114
- Download Speed109 / 118
- Police Chase99 / 107
- School Dance121 / 127
- Distinct Routes88 / 115
Range Queries
- Range Sum Queries I913 / 949
- Range Minimum Queries I752 / 794
- Range Sum Queries II747 / 780
- Range Minimum Queries II654 / 666
- Range Xor Queries667 / 675
- Range Update Queries560 / 591
- Forest Queries422 / 432
- Hotel Queries462 / 524
- List Removals340 / 362
- Salary Queries323 / 375
- Subarray Sum Queries283 / 297
- Distinct Values Queries243 / 305
- Forest Queries II198 / 210
- Range Updates and Sums172 / 218
- Polynomial Queries151 / 175
- Range Queries and Copies97 / 102
Tree Algorithms
- Subordinates538 / 561
- Tree Matching322 / 396
- Tree Diameter481 / 500
- Tree Distances I355 / 394
- Tree Distances II309 / 318
- Company Queries I296 / 309
- Company Queries II286 / 296
- Distance Queries309 / 326
- Counting Paths222 / 235
- Subtree Queries273 / 283
- Path Queries219 / 226
- Distinct Colors245 / 272
Mathematics
- Exponentiation862 / 944
- Exponentiation II546 / 710
- Counting Divisors567 / 654
- Common Divisors405 / 471
- Sum of Divisors259 / 391
- Binomial Coefficients352 / 414
- Creating Strings II285 / 321
- Distributing Apples268 / 285
- Christmas Party223 / 250
- Fibonacci Numbers309 / 372
- Throwing Dice206 / 219
- Graph Paths I160 / 179
- Graph Paths II124 / 131
- Dice Probability160 / 175
- Moving Robots91 / 102
- Candy Lottery128 / 135
- Inversion Probability127 / 131
- Stick Game167 / 172
- Nim Game I219 / 228
- Nim Game II196 / 201
- Stair Game121 / 155
String Algorithms
- Word Combinations129 / 221
- String Matching246 / 346
- Finding Borders208 / 240
- Finding Periods133 / 158
- Minimal Rotation144 / 196
- Longest Palindrome162 / 202
- Required Substring83 / 150
Additional Problems
- Shortest Subsequence282 / 346
- Counting Bits272 / 321
- Swap Game80 / 106
- Meet in the Middle155 / 190
- Prüfer Code132 / 139
- Edge Directions122 / 131
- Advertisement225 / 239
- Elevator Rides95 / 127
- Maximum Xor Subarray109 / 115
- Movie Festival Queries50 / 59
- Chess Tournament61 / 72
- Tree Traversals58 / 59
- Network Renovation50 / 80
- Graph Girth67 / 76
- Intersection Points62 / 68
- String Reorder47 / 54
- Pyramid Array39 / 55
- Increasing Subsequence II98 / 102
- String Removals100 / 105
- Bit Inversions116 / 125
- Writing Numbers105 / 117
- String Transform57 / 72
- Maximum Building I119 / 122
- Sorting Methods83 / 88
- Cyclic Array46 / 83
- Food Division51 / 63
- Bit Problem54 / 60
- Swap Round Sorting29 / 43
- Tree Isomorphism I52 / 60
- Critical Cities30 / 50
- School Excursion65 / 69
- Coin Grid36 / 49
- Robot Path19 / 36
- Course Schedule II50 / 79
- Empty String59 / 79
- Grid Paths76 / 87
- Book Shop II82 / 94
- Network Breakdown63 / 65
- Visiting Cities66 / 90
- Number Grid113 / 135
- Maximum Building II41 / 49
- Stick Divisions111 / 128
- Coding Company33 / 47
- Flight Route Requests41 / 44
- Tree Isomorphism II49 / 61
- Forbidden Cities29 / 37
- Area of Rectangles50 / 61
- Creating Offices23 / 36
- Permutations II78 / 87
- New Flight Routes20 / 44