General
Introductory Problems
- Weird Algorithm2933 / 3068
- Missing Number2251 / 2445
- Repetitions1994 / 2127
- Increasing Array1888 / 1962
- Permutations1664 / 1730
- Number Spiral1188 / 1269
- Two Knights848 / 909
- Two Sets904 / 957
- Bit Strings961 / 1001
- Trailing Zeros870 / 924
- Coin Piles769 / 859
- Palindrome Reorder697 / 736
- Creating Strings I675 / 691
- Apple Division607 / 678
- Chessboard and Queens362 / 370
- Grid Paths170 / 229
Sorting and Searching
- Distinct Numbers1040 / 1070
- Apartments788 / 917
- Ferris Wheel753 / 831
- Concert Tickets581 / 708
- Restaurant Customers518 / 554
- Movie Festival484 / 503
- Sum of Two Values565 / 605
- Maximum Subarray Sum577 / 600
- Stick Lengths621 / 646
- Playlist554 / 704
- Towers553 / 596
- Traffic Lights356 / 389
- Room Allocation315 / 358
- Factory Machines303 / 350
- Tasks and Deadlines289 / 293
- Reading Books252 / 280
- Sum of Three Values348 / 375
- Sum of Four Values278 / 292
- Nearest Smaller Values274 / 327
- Subarray Sums I363 / 370
- Subarray Sums II261 / 327
- Subarray Divisibility272 / 287
- Array Division321 / 346
- Sliding Median289 / 327
- Sliding Cost215 / 238
- Movie Festival II160 / 206
- Maximum Subarray Sum II202 / 222
Dynamic Programming
- Dice Combinations967 / 1035
- Minimizing Coins865 / 906
- Coin Combinations I765 / 801
- Coin Combinations II600 / 688
- Removing Digits727 / 745
- Grid Paths633 / 659
- Book Shop629 / 708
- Array Description393 / 438
- Edit Distance424 / 443
- Rectangle Cutting387 / 425
- Money Sums441 / 456
- Removal Game405 / 434
- Two Sets II396 / 438
- Increasing Subsequence468 / 537
- Projects310 / 359
Graph Algorithms
- Counting Rooms660 / 709
- Labyrinth414 / 506
- Building Roads461 / 479
- Message Route401 / 418
- Building Teams371 / 393
- Round Trip301 / 338
- Monsters197 / 241
- Shortest Routes I311 / 323
- Shortest Routes II291 / 313
- High Score154 / 210
- Flight Discount209 / 256
- Cycle Finding185 / 207
- Flight Routes147 / 157
- Round Trip II148 / 158
- Course Schedule198 / 206
- Longest Flight Route148 / 167
- Game Routes152 / 165
- Investigation128 / 140
- Planets Queries I117 / 127
- Planets Queries II85 / 100
- Planets Cycles70 / 75
- Road Reparation142 / 146
- Road Construction133 / 134
- Flight Routes Check106 / 114
- Planets and Kingdoms125 / 128
- Giant Pizza80 / 87
- Coin Collector90 / 97
- Mail Delivery74 / 82
- De Bruijn Sequence60 / 63
- Teleporters Path68 / 75
- Hamiltonian Flights55 / 79
- Knight's Tour60 / 67
- Download Speed75 / 80
- Police Chase66 / 71
- School Dance87 / 90
- Distinct Routes55 / 79
Range Queries
- Range Sum Queries I517 / 538
- Range Minimum Queries I424 / 452
- Range Sum Queries II426 / 447
- Range Minimum Queries II370 / 379
- Range Xor Queries376 / 381
- Range Update Queries316 / 332
- Forest Queries235 / 242
- Hotel Queries310 / 366
- List Removals190 / 204
- Salary Queries201 / 237
- Subarray Sum Queries178 / 183
- Distinct Values Queries147 / 186
- Forest Queries II117 / 125
- Range Updates and Sums94 / 121
- Polynomial Queries90 / 106
- Range Queries and Copies64 / 67
Tree Algorithms
- Subordinates330 / 344
- Tree Matching209 / 257
- Tree Diameter314 / 330
- Tree Distances I232 / 252
- Tree Distances II183 / 191
- Company Queries I161 / 167
- Company Queries II155 / 160
- Distance Queries195 / 206
- Counting Paths138 / 147
- Subtree Queries172 / 179
- Path Queries142 / 145
- Distinct Colors163 / 177
Mathematics
- Exponentiation525 / 577
- Exponentiation II322 / 405
- Counting Divisors326 / 372
- Common Divisors257 / 286
- Sum of Divisors165 / 235
- Binomial Coefficients244 / 266
- Creating Strings II173 / 194
- Distributing Apples155 / 169
- Christmas Party127 / 139
- Fibonacci Numbers186 / 225
- Throwing Dice141 / 149
- Graph Paths I93 / 106
- Graph Paths II70 / 77
- Dice Probability102 / 109
- Moving Robots56 / 63
- Candy Lottery95 / 99
- Inversion Probability92 / 95
- Stick Game111 / 116
- Nim Game I152 / 156
- Nim Game II150 / 157
- Stair Game90 / 118
String Algorithms
- Word Combinations80 / 127
- String Matching171 / 201
- Finding Borders121 / 134
- Finding Periods78 / 93
- Minimal Rotation104 / 147
- Longest Palindrome116 / 141
- Required Substring56 / 106
Additional Problems
- Shortest Subsequence235 / 275
- Counting Bits217 / 248
- Swap Game53 / 66
- Meet in the Middle111 / 133
- Prüfer Code100 / 107
- Edge Directions78 / 86
- Advertisement195 / 208
- Elevator Rides49 / 64
- Maximum Xor Subarray71 / 76
- Movie Festival Queries31 / 41
- Chess Tournament39 / 46
- Tree Traversals41 / 42
- Network Renovation32 / 49
- Graph Girth43 / 46
- Intersection Points42 / 47
- String Reorder28 / 32
- Pyramid Array25 / 36
- Increasing Subsequence II68 / 71
- String Removals80 / 85
- Bit Inversions100 / 106
- Writing Numbers88 / 100
- String Transform40 / 51
- Maximum Building I93 / 97
- Sorting Methods67 / 71
- Cyclic Array59 / 66
- Food Division38 / 46
- Bit Problem37 / 41
- Swap Round Sorting18 / 28
- Tree Isomorphism I34 / 41
- Critical Cities19 / 28
- School Excursion42 / 44
- Coin Grid22 / 33
- Robot Path11 / 20
- Course Schedule II32 / 48
- Empty String47 / 58
- Grid Paths60 / 66
- Book Shop II62 / 73
- Network Breakdown38 / 39
- Visiting Cities46 / 68
- Number Grid92 / 113
- Maximum Building II34 / 40
- Stick Divisions86 / 102
- Coding Company20 / 28
- Flight Route Requests23 / 27
- Tree Isomorphism II29 / 39
- Forbidden Cities19 / 23
- Area of Rectangles31 / 37
- Creating Offices18 / 27
- Permutations II66 / 74
- New Flight Routes17 / 33