General
Introductory Problems
- Weird Algorithm16477 / 17173
- Missing Number13762 / 14693
- Repetitions12154 / 12870
- Increasing Array11209 / 11728
- Permutations9965 / 10330
- Number Spiral6902 / 7548
- Two Knights5167 / 5359
- Two Sets5488 / 5940
- Bit Strings6584 / 6948
- Trailing Zeros6237 / 6652
- Coin Piles5425 / 6016
- Palindrome Reorder4745 / 5129
- Creating Strings I4557 / 4685
- Apple Division3961 / 4628
- Chessboard and Queens2335 / 2379
- Grid Paths1010 / 1325
Sorting and Searching
- Distinct Numbers6632 / 6859
- Apartments4441 / 5217
- Ferris Wheel4273 / 4778
- Concert Tickets3271 / 4114
- Restaurant Customers3377 / 3713
- Movie Festival3221 / 3424
- Sum of Two Values3778 / 4130
- Maximum Subarray Sum3783 / 3924
- Stick Lengths3494 / 3662
- Playlist3010 / 3523
- Towers2908 / 3163
- Traffic Lights2141 / 2441
- Room Allocation1816 / 2207
- Factory Machines2011 / 2215
- Tasks and Deadlines1981 / 2018
- Reading Books1794 / 1935
- Sum of Three Values2126 / 2398
- Sum of Four Values1677 / 1817
- Nearest Smaller Values1966 / 2073
- Subarray Sums I2317 / 2418
- Subarray Sums II1961 / 2205
- Subarray Divisibility1888 / 2009
- Array Division1615 / 1712
- Sliding Median1331 / 1576
- Sliding Cost949 / 1085
- Movie Festival II905 / 1125
- Maximum Subarray Sum II975 / 1177
Dynamic Programming
- Dice Combinations5498 / 5822
- Minimizing Coins4801 / 5114
- Coin Combinations I4385 / 4685
- Coin Combinations II3548 / 4099
- Removing Digits4203 / 4280
- Grid Paths3739 / 3906
- Book Shop3422 / 3803
- Array Description2291 / 2559
- Edit Distance2607 / 2764
- Rectangle Cutting2299 / 2526
- Money Sums2611 / 2705
- Removal Game2012 / 2164
- Two Sets II2085 / 2293
- Increasing Subsequence2279 / 2594
- Projects1438 / 1669
Graph Algorithms
- Counting Rooms3753 / 3972
- Labyrinth2273 / 2881
- Building Roads2907 / 3004
- Message Route2530 / 2651
- Building Teams2449 / 2566
- Round Trip1905 / 2122
- Monsters1074 / 1374
- Shortest Routes I1881 / 2157
- Shortest Routes II1706 / 1838
- High Score917 / 1351
- Flight Discount1152 / 1391
- Cycle Finding937 / 1141
- Flight Routes785 / 871
- Round Trip II963 / 1081
- Course Schedule1177 / 1231
- Longest Flight Route898 / 1049
- Game Routes937 / 990
- Investigation649 / 717
- Planets Queries I674 / 728
- Planets Queries II333 / 407
- Planets Cycles403 / 441
- Road Reparation769 / 792
- Road Construction710 / 723
- Flight Routes Check621 / 686
- Planets and Kingdoms616 / 636
- Giant Pizza361 / 380
- Coin Collector421 / 469
- Mail Delivery374 / 429
- De Bruijn Sequence280 / 293
- Teleporters Path316 / 357
- Hamiltonian Flights313 / 373
- Knight's Tour276 / 307
- Download Speed335 / 355
- Police Chase279 / 298
- School Dance303 / 318
- Distinct Routes235 / 300
Range Queries
- Range Sum Queries I2515 / 2626
- Range Minimum Queries I1975 / 2097
- Range Sum Queries II1958 / 2042
- Range Minimum Queries II1737 / 1779
- Range Xor Queries1795 / 1822
- Range Update Queries1373 / 1473
- Forest Queries1159 / 1189
- Hotel Queries1040 / 1139
- List Removals876 / 933
- Salary Queries730 / 860
- Subarray Sum Queries621 / 722
- Distinct Values Queries610 / 733
- Forest Queries II498 / 527
- Range Updates and Sums441 / 536
- Polynomial Queries367 / 423
- Range Queries and Copies236 / 247
Tree Algorithms
- Subordinates1878 / 1964
- Tree Matching1011 / 1230
- Tree Diameter1581 / 1661
- Tree Distances I1090 / 1208
- Tree Distances II888 / 926
- Company Queries I934 / 992
- Company Queries II886 / 927
- Distance Queries892 / 945
- Counting Paths612 / 649
- Subtree Queries699 / 735
- Path Queries570 / 600
- Distinct Colors572 / 644
Mathematics
- Exponentiation2460 / 2739
- Exponentiation II1674 / 2137
- Counting Divisors1759 / 2077
- Common Divisors1253 / 1457
- Sum of Divisors709 / 1181
- Binomial Coefficients1017 / 1172
- Creating Strings II850 / 937
- Distributing Apples796 / 860
- Christmas Party688 / 742
- Fibonacci Numbers864 / 1093
- Throwing Dice559 / 608
- Graph Paths I453 / 491
- Graph Paths II359 / 377
- Dice Probability440 / 472
- Moving Robots236 / 256
- Candy Lottery326 / 335
- Inversion Probability299 / 305
- Stick Game431 / 443
- Nim Game I536 / 558
- Nim Game II441 / 460
- Stair Game280 / 335
String Algorithms
- Word Combinations332 / 572
- String Matching697 / 956
- Finding Borders491 / 582
- Finding Periods315 / 384
- Minimal Rotation279 / 399
- Longest Palindrome340 / 453
- Required Substring173 / 303
Additional Problems
- Shortest Subsequence479 / 644
- Counting Bits522 / 649
- Swap Game172 / 240
- Meet in the Middle318 / 402
- Prüfer Code203 / 214
- Edge Directions273 / 290
- Advertisement344 / 366
- Elevator Rides177 / 240
- Maximum Xor Subarray241 / 262
- Movie Festival Queries116 / 134
- Chess Tournament139 / 164
- Tree Traversals144 / 148
- Network Renovation111 / 170
- Graph Girth163 / 182
- Intersection Points137 / 147
- String Reorder99 / 109
- Pyramid Array89 / 113
- Increasing Subsequence II196 / 210
- String Removals161 / 167
- Bit Inversions198 / 216
- Writing Numbers157 / 172
- String Transform88 / 113
- Maximum Building I204 / 210
- Sorting Methods138 / 148
- Cyclic Array87 / 124
- Food Division82 / 99
- Bit Problem102 / 112
- Swap Round Sorting59 / 77
- Tree Isomorphism I114 / 143
- Critical Cities53 / 81
- School Excursion113 / 125
- Coin Grid71 / 89
- Robot Path43 / 83
- Course Schedule II92 / 152
- Empty String107 / 142
- Grid Paths125 / 153
- Book Shop II124 / 142
- Network Breakdown110 / 113
- Visiting Cities105 / 143
- Number Grid159 / 200
- Maximum Building II68 / 82
- Stick Divisions187 / 228
- Coding Company72 / 89
- Flight Route Requests75 / 80
- Tree Isomorphism II89 / 108
- Forbidden Cities69 / 85
- Area of Rectangles98 / 114
- Creating Offices52 / 73
- Permutations II147 / 162
- New Flight Routes50 / 112