General
Introductory Problems
- Weird Algorithm14387 / 14979
- Missing Number11943 / 12761
- Repetitions10562 / 11196
- Increasing Array9785 / 10235
- Permutations8682 / 8983
- Number Spiral6021 / 6584
- Two Knights4462 / 4643
- Two Sets4759 / 5161
- Bit Strings5711 / 6031
- Trailing Zeros5383 / 5737
- Coin Piles4667 / 5171
- Palindrome Reorder4118 / 4441
- Creating Strings I3960 / 4066
- Apple Division3425 / 4014
- Chessboard and Queens1998 / 2036
- Grid Paths864 / 1142
Sorting and Searching
- Distinct Numbers5689 / 5885
- Apartments3802 / 4457
- Ferris Wheel3661 / 4102
- Concert Tickets2766 / 3513
- Restaurant Customers2845 / 3136
- Movie Festival2697 / 2875
- Sum of Two Values3200 / 3501
- Maximum Subarray Sum3231 / 3363
- Stick Lengths2941 / 3092
- Playlist2546 / 2994
- Towers2470 / 2697
- Traffic Lights1803 / 2066
- Room Allocation1517 / 1847
- Factory Machines1697 / 1876
- Tasks and Deadlines1676 / 1704
- Reading Books1514 / 1643
- Sum of Three Values1791 / 2036
- Sum of Four Values1409 / 1530
- Nearest Smaller Values1666 / 1759
- Subarray Sums I1959 / 2054
- Subarray Sums II1643 / 1863
- Subarray Divisibility1601 / 1700
- Array Division1381 / 1468
- Sliding Median1125 / 1334
- Sliding Cost803 / 921
- Movie Festival II766 / 959
- Maximum Subarray Sum II820 / 1002
Dynamic Programming
- Dice Combinations4699 / 4966
- Minimizing Coins4116 / 4381
- Coin Combinations I3751 / 4005
- Coin Combinations II3032 / 3519
- Removing Digits3581 / 3651
- Grid Paths3204 / 3363
- Book Shop2906 / 3223
- Array Description1905 / 2152
- Edit Distance2190 / 2321
- Rectangle Cutting1926 / 2127
- Money Sums2200 / 2280
- Removal Game1707 / 1833
- Two Sets II1759 / 1931
- Increasing Subsequence1921 / 2193
- Projects1199 / 1395
Graph Algorithms
- Counting Rooms3107 / 3298
- Labyrinth1856 / 2365
- Building Roads2357 / 2446
- Message Route2053 / 2153
- Building Teams1985 / 2081
- Round Trip1541 / 1722
- Monsters861 / 1125
- Shortest Routes I1529 / 1763
- Shortest Routes II1400 / 1520
- High Score735 / 1104
- Flight Discount928 / 1126
- Cycle Finding740 / 925
- Flight Routes629 / 697
- Round Trip II743 / 833
- Course Schedule937 / 987
- Longest Flight Route712 / 841
- Game Routes749 / 795
- Investigation515 / 570
- Planets Queries I563 / 605
- Planets Queries II284 / 344
- Planets Cycles336 / 372
- Road Reparation617 / 637
- Road Construction570 / 582
- Flight Routes Check485 / 544
- Planets and Kingdoms507 / 523
- Giant Pizza311 / 330
- Coin Collector355 / 396
- Mail Delivery305 / 359
- De Bruijn Sequence235 / 247
- Teleporters Path255 / 295
- Hamiltonian Flights255 / 312
- Knight's Tour237 / 267
- Download Speed261 / 276
- Police Chase234 / 247
- School Dance256 / 269
- Distinct Routes194 / 248
Range Queries
- Range Sum Queries I2185 / 2278
- Range Minimum Queries I1697 / 1812
- Range Sum Queries II1680 / 1756
- Range Minimum Queries II1489 / 1526
- Range Xor Queries1553 / 1576
- Range Update Queries1170 / 1263
- Forest Queries994 / 1017
- Hotel Queries920 / 1008
- List Removals758 / 808
- Salary Queries630 / 745
- Subarray Sum Queries532 / 631
- Distinct Values Queries528 / 645
- Forest Queries II430 / 457
- Range Updates and Sums372 / 453
- Polynomial Queries322 / 370
- Range Queries and Copies203 / 215
Tree Algorithms
- Subordinates1562 / 1636
- Tree Matching822 / 1010
- Tree Diameter1297 / 1363
- Tree Distances I902 / 994
- Tree Distances II730 / 760
- Company Queries I755 / 795
- Company Queries II718 / 747
- Distance Queries739 / 781
- Counting Paths515 / 548
- Subtree Queries590 / 620
- Path Queries478 / 505
- Distinct Colors489 / 557
Mathematics
- Exponentiation2099 / 2337
- Exponentiation II1399 / 1805
- Counting Divisors1468 / 1744
- Common Divisors1017 / 1200
- Sum of Divisors591 / 978
- Binomial Coefficients832 / 972
- Creating Strings II699 / 773
- Distributing Apples665 / 719
- Christmas Party578 / 630
- Fibonacci Numbers715 / 910
- Throwing Dice456 / 505
- Graph Paths I379 / 413
- Graph Paths II298 / 313
- Dice Probability364 / 392
- Moving Robots201 / 218
- Candy Lottery275 / 283
- Inversion Probability258 / 263
- Stick Game364 / 373
- Nim Game I467 / 485
- Nim Game II386 / 401
- Stair Game237 / 288
String Algorithms
- Word Combinations282 / 482
- String Matching575 / 785
- Finding Borders416 / 486
- Finding Periods271 / 329
- Minimal Rotation246 / 350
- Longest Palindrome294 / 386
- Required Substring149 / 265
Additional Problems
- Shortest Subsequence427 / 565
- Counting Bits460 / 572
- Swap Game153 / 212
- Meet in the Middle272 / 346
- Prüfer Code186 / 195
- Edge Directions241 / 256
- Advertisement325 / 346
- Elevator Rides154 / 211
- Maximum Xor Subarray205 / 224
- Movie Festival Queries98 / 116
- Chess Tournament123 / 145
- Tree Traversals125 / 128
- Network Renovation95 / 150
- Graph Girth137 / 154
- Intersection Points122 / 130
- String Reorder86 / 95
- Pyramid Array79 / 100
- Increasing Subsequence II170 / 183
- String Removals149 / 155
- Bit Inversions178 / 194
- Writing Numbers147 / 162
- String Transform80 / 104
- Maximum Building I188 / 194
- Sorting Methods127 / 137
- Cyclic Array80 / 114
- Food Division74 / 91
- Bit Problem92 / 101
- Swap Round Sorting51 / 69
- Tree Isomorphism I102 / 131
- Critical Cities44 / 76
- School Excursion104 / 116
- Coin Grid61 / 78
- Robot Path36 / 75
- Course Schedule II79 / 135
- Empty String98 / 133
- Grid Paths109 / 137
- Book Shop II115 / 132
- Network Breakdown98 / 102
- Visiting Cities96 / 133
- Number Grid150 / 183
- Maximum Building II58 / 71
- Stick Divisions165 / 198
- Coding Company66 / 82
- Flight Route Requests68 / 73
- Tree Isomorphism II79 / 98
- Forbidden Cities60 / 77
- Area of Rectangles88 / 104
- Creating Offices43 / 62
- Permutations II135 / 148
- New Flight Routes35 / 90