General
Introductory Problems
- Weird Algorithm10062 / 10477
- Missing Number8194 / 8792
- Repetitions7183 / 7621
- Increasing Array6583 / 6877
- Permutations5811 / 6018
- Number Spiral3981 / 4344
- Two Knights2917 / 3048
- Two Sets3111 / 3365
- Bit Strings3728 / 3934
- Trailing Zeros3494 / 3733
- Coin Piles2998 / 3343
- Palindrome Reorder2641 / 2856
- Creating Strings I2546 / 2608
- Apple Division2153 / 2536
- Chessboard and Queens1294 / 1324
- Grid Paths535 / 723
Sorting and Searching
- Distinct Numbers3660 / 3781
- Apartments2386 / 2843
- Ferris Wheel2314 / 2624
- Concert Tickets1704 / 2183
- Restaurant Customers1722 / 1890
- Movie Festival1651 / 1746
- Sum of Two Values1943 / 2119
- Maximum Subarray Sum1951 / 2053
- Stick Lengths1838 / 1927
- Playlist1598 / 1914
- Towers1560 / 1692
- Traffic Lights1109 / 1270
- Room Allocation958 / 1136
- Factory Machines1042 / 1159
- Tasks and Deadlines1029 / 1043
- Reading Books915 / 998
- Sum of Three Values1131 / 1245
- Sum of Four Values883 / 968
- Nearest Smaller Values989 / 1060
- Subarray Sums I1160 / 1232
- Subarray Sums II940 / 1099
- Subarray Divisibility944 / 1002
- Array Division838 / 910
- Sliding Median716 / 833
- Sliding Cost521 / 581
- Movie Festival II472 / 590
- Maximum Subarray Sum II502 / 612
Dynamic Programming
- Dice Combinations2837 / 3003
- Minimizing Coins2503 / 2663
- Coin Combinations I2259 / 2397
- Coin Combinations II1780 / 2067
- Removing Digits2135 / 2179
- Grid Paths1900 / 1982
- Book Shop1736 / 1902
- Array Description1130 / 1264
- Edit Distance1258 / 1333
- Rectangle Cutting1121 / 1234
- Money Sums1294 / 1342
- Removal Game1027 / 1105
- Two Sets II1032 / 1146
- Increasing Subsequence1177 / 1345
- Projects750 / 859
Graph Algorithms
- Counting Rooms1821 / 1954
- Labyrinth1100 / 1398
- Building Roads1325 / 1380
- Message Route1169 / 1236
- Building Teams1111 / 1174
- Round Trip860 / 992
- Monsters485 / 663
- Shortest Routes I845 / 966
- Shortest Routes II792 / 856
- High Score420 / 629
- Flight Discount512 / 638
- Cycle Finding450 / 532
- Flight Routes365 / 410
- Round Trip II383 / 448
- Course Schedule507 / 539
- Longest Flight Route384 / 477
- Game Routes410 / 440
- Investigation305 / 332
- Planets Queries I325 / 352
- Planets Queries II183 / 219
- Planets Cycles206 / 221
- Road Reparation356 / 368
- Road Construction337 / 341
- Flight Routes Check267 / 282
- Planets and Kingdoms298 / 307
- Giant Pizza177 / 197
- Coin Collector208 / 232
- Mail Delivery164 / 207
- De Bruijn Sequence153 / 159
- Teleporters Path146 / 180
- Hamiltonian Flights150 / 190
- Knight's Tour147 / 168
- Download Speed159 / 170
- Police Chase146 / 156
- School Dance165 / 174
- Distinct Routes116 / 158
Range Queries
- Range Sum Queries I1368 / 1427
- Range Minimum Queries I1074 / 1142
- Range Sum Queries II1067 / 1116
- Range Minimum Queries II927 / 949
- Range Xor Queries955 / 968
- Range Update Queries773 / 820
- Forest Queries604 / 613
- Hotel Queries612 / 680
- List Removals478 / 512
- Salary Queries427 / 501
- Subarray Sum Queries386 / 406
- Distinct Values Queries336 / 416
- Forest Queries II283 / 302
- Range Updates and Sums238 / 295
- Polynomial Queries210 / 243
- Range Queries and Copies143 / 148
Tree Algorithms
- Subordinates844 / 889
- Tree Matching489 / 587
- Tree Diameter729 / 757
- Tree Distances I496 / 556
- Tree Distances II444 / 461
- Company Queries I436 / 452
- Company Queries II413 / 432
- Distance Queries453 / 479
- Counting Paths317 / 334
- Subtree Queries375 / 386
- Path Queries306 / 318
- Distinct Colors331 / 370
Mathematics
- Exponentiation1344 / 1486
- Exponentiation II848 / 1122
- Counting Divisors912 / 1073
- Common Divisors629 / 747
- Sum of Divisors392 / 632
- Binomial Coefficients549 / 641
- Creating Strings II443 / 495
- Distributing Apples420 / 448
- Christmas Party366 / 403
- Fibonacci Numbers469 / 602
- Throwing Dice293 / 319
- Graph Paths I237 / 263
- Graph Paths II187 / 195
- Dice Probability229 / 249
- Moving Robots135 / 147
- Candy Lottery177 / 185
- Inversion Probability170 / 175
- Stick Game233 / 238
- Nim Game I306 / 320
- Nim Game II261 / 268
- Stair Game160 / 196
String Algorithms
- Word Combinations180 / 302
- String Matching360 / 495
- Finding Borders291 / 330
- Finding Periods185 / 223
- Minimal Rotation182 / 253
- Longest Palindrome216 / 276
- Required Substring104 / 194
Additional Problems
- Shortest Subsequence327 / 415
- Counting Bits343 / 419
- Swap Game102 / 140
- Meet in the Middle205 / 245
- Prüfer Code148 / 157
- Edge Directions156 / 169
- Advertisement255 / 272
- Elevator Rides113 / 150
- Maximum Xor Subarray143 / 152
- Movie Festival Queries69 / 82
- Chess Tournament90 / 105
- Tree Traversals87 / 89
- 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 Transform62 / 80
- Maximum Building I139 / 143
- Sorting Methods99 / 104
- Cyclic Array63 / 99
- Food Division58 / 74
- Bit Problem63 / 71
- Swap Round Sorting38 / 53
- Tree Isomorphism I65 / 74
- Critical Cities28 / 63
- School Excursion79 / 86
- Coin Grid47 / 61
- Robot Path21 / 45
- Course Schedule II56 / 94
- Empty String68 / 93
- Grid Paths90 / 104
- Book Shop II99 / 113
- Network Breakdown79 / 83
- Visiting Cities77 / 106
- Number Grid134 / 161
- Maximum Building II48 / 59
- Stick Divisions129 / 147
- Coding Company43 / 57
- Flight Route Requests50 / 53
- Tree Isomorphism II59 / 74
- Forbidden Cities40 / 49
- Area of Rectangles61 / 74
- Creating Offices29 / 42
- Permutations II94 / 104
- New Flight Routes23 / 59