Problem solutions of some algorithm problems from online judge platforms.
| platform | problems solved |
|---|---|
| UVa | 568 |
| Codeforces | 419 |
| LeetCode | 20 |
| Hacker Rank | 20(SQL) |
| language | lines of code |
|---|---|
| Java | 70851 |
| C++ | 3214 |
| Python | 1193 |
| SQL | 101 |
This repository contains solutions to various algorithm problems from platforms such as Codeforces, HackerRank, LeetCode, Lintcode, Nowcoder, and UVa. Each solution is organized by problem number and includes the source code, input files, and occasionally, additional documentation.
README.md: This file.codeforces/: Contains solutions to Codeforces problems.hacker_rank/: Contains solutions to HackerRank SQL problems.leetcode/: Contains solutions to LeetCode problems.lintcode/: Contains solutions to Lintcode problems.nowcoder/: Contains solutions to Nowcoder problems.uva/: Contains solutions to UVa problems.
Each subdirectory within the codeforces directory is named after a problem number and includes the following:
1.in: Input file for the problem.src/Main.java: Java source code file containing the solution to the problem.
The hacker_rank directory contains SQL files for various problems. Each file is named after the problem it solves.
The leetcode directory contains Python scripts for different problems. The files are named after the problems they solve, such as two_sum.py or valid_parentheses.py.
Each subdirectory within the lintcode directory is named after a problem number and includes the following:
src/com/lintcode/Main.java: Main class file for the solution.src/com/lintcode/Solution.java: Solution class file for the problem.src/com/lintcode/: Additional class files as required by the problem.
Each subdirectory within the nowcoder directory is named after a problem and includes the following:
Solution.java: Solution class file for the problem.Test.java: Test class file for the problem.TreeNode.java: (If applicable) TreeNode class file for problems involving tree structures.
Solved: 568, Submissions: 1776
| Q1 | Q2 | Q3 |
|---|---|---|
| 100: The 3n + 1 Problem | 101: The Blocks Problem | 102: Ecological Bin Packing |
| 103: Stacking Boxes | 104: Arbitrage | 105: The Skyline Problem |
| 106: Fermat's Last Theorem | 107: The Cat in the Hat | 108: Maximum Sum |
| 110: Meta-Loopless Sorts | 111: History Grading | 112: Tree Summing |
| 113: Power of Cryptography | 116: Unidirectional TSP | 118: Mutant Flatworld Explorers |
| 119: Greedy Gift Givers | 120: Stacks of Flapjacks | 122: Trees on the Level |
| 123: Searching Quickly | 124: Following Orders | 127: "Accordian" Patience |
| 128: Software CRC | 129: Krypton Factor | 131: The Domino Effect |
| 133: The Dole Queue | 136: Ugly Numbers | 138: Street Numbers |
| 140: Bandwidth | 146: ID Codes | 147: Dollars |
| 151: Power Crisis | 152: Tree's a Crowd | 156: Ananagrams |
| 160: Factors and Factorials | 167: The Sultan's Successors | 185: Roman Numerals |
| 190: Circle Through Three Points | 193: Graph Coloring | 195: Anagram |
| 196: Spreadsheet | 197: Orbiting Satellites | 200: Rare Order |
| 201: Squares | 202: Repeating Decimals | 208: Firetruck |
| 210: Determining Periods | 211: The Domino Effect | 213: Message Decoding |
| 216: Getting in Line | 221: Partitioning Polygon | 225: Golomb Rulers |
| 227: Puzzle | 230: Borrowers | 231: Testing the CATCHER |
| 247: Calling Circles | 253: Cube painting | 256: Quirksome Squares |
| 260: Il Gioco dell'X | 264: Count on Cantor | 272: TEX Quotes |
| 278: Chess | 280: Vertex | 291: The House Of Santa Claus |
| 294: Divisors | 297: Quadtrees | 299: Train Swapping |
| 301: Transportation | 305: Joseph | 307: Sticks |
| 315: Network | 317: Power Transmission | 324: Factorial Frequencies |
| 327: Evaluating Simple C Expressions | 331: Mapping the Swaps | 336: A Node Too Far |
| 340: Master-Mind Hints | 343: What Base Is This? | 344: Roman Digititis |
| 348: Optimal Array Multiplication Sequence | 350: Pseudo-Random Numbers | 352: The Seasonal War |
| 353: Pesky Palindromes | 357: Let Me Count The Ways | 369: Combinations |
| 371: Ackermann Functions | 374: Big Mod | 375: Inscribed Circles and Isosceles Triangles |
| 378: Intersecting Lines | 382: Perfection | 386: Perfect Cubes |
| 387: Repeated Substitution with Sed | 389: Basically Speaking | 392: Polynomial Showdown |
| 400: Unix ls | 401: Palindromes | 406: Prime Cuts |
| 408: Uniform Generator | 409: Excuses, Excuses! | 412: Pi |
| 414: Machined Surfaces | 417: Word Index | 424: Integer Inquiry |
| 429: Word Transformation | 437: The Tower of Babylon | 438: The Circumference of the Circle |
| 439: Knight Moves | 440: Eeny Meeny Moo | 441: Lotto |
| 442: Matrix Chain Multiplication | 443: Humble Numbers | 444: Encoder and Decoder |
| 445: Marvelous Mazes | 446: Kibbles n' Bits n' Bits `n' Bits |
455: Periodic Strings |
| 457: Linear Cellular Automata | 458: The Decoder | 459: Graph Connectivity |
| 465: Overflow | 469: Wetlands of Florida | 476: Points in Figures: Rectangles |
| 477: Points in Figures: Rectangles and Circles | 478: Points in Figures: Rectangles, Circles, Triangles | 481: What Goes Up |
| 482: Permutation Arrays | 483: Word Scramble | 484: The Department of Redundancy Department |
| 488: Triangle Wave | 489: Hangman Judge | 490: Rotating Sentences |
| 492: Pig-Latin | 494: Kindergarten Counting Game | 495: Fibonacci Freeze |
| 496: Simply Subsets | 497: Strategic Defense Initiative | 499: What's The Frequency, Kenneth? |
| 507: Jill Rides Again | 509: Just the Facts | 512: Taiwan Railway |
| 514: Rails | 524: Prime Ring Problem | 530: Binomial Showdown |
| 531: Compromise | 532: Dungeon Master | 534: Frogger |
| 536: Tree Recovery | 537: Railroads | 539: The Settlers of Catan |
| 540: Team Queue | 541: Error Correction | 543: Goldbach's Conjecture |
| 544: Heavy Cargo | 548: Tree | 550: Multiplying by Rotation |
| 558: Wormholes | 562: Dividing coins | 567: Risk |
| 568: Just the Facts | 572: Oil Deposits | 573: The Snail |
| 574: Sum It Up | 575: Skew Binary | 576: Haiku Review |
| 579: Clock Hands | 583: Prime Factors | 591: Box of Bricks |
| 594: One Little, Two Little, Three Little Endians | 612: DNA Sorting | 621: Secret Research |
| 623: 500! | 624: CD | 637: Booklet Printing |
| 639: Don't Get Rooked | 640: Self Numbers | 644: Immediate Decodability |
| 657: The die is cast | 661: Blowing Fuses | 673: Parentheses Balance |
| 674: Coin Change | 679: Dropping Balls | 686: Goldbach's Conjecture (II) |
| 694: The Collatz Sequence | 696: How Many Knights | 699: The Falling Leaves |
| 705: Slash Maze | 706: LC-Display | 712: S-Trees |
| 713: Adding Reversed Numbers | 714: Copying Books | 725: Division |
| 727: Equation | 729: The Hamming Distance Problem | 748: Exponentiation |
| 750: 8 Queens Chess Problem | 755: 487--3279 | 784: Maze Exploration |
| 793: Network Connections | 796: Critical Links | 815: Flooded! |
| 818: Job Matching | 820: Internet Bandwidth | 821: Page Hopping |
| 834: Continued Fractions | 836: Largest Submatrix | 839: Not so Mobile |
| 846: Steps | 847: A Multiplication Game | 900: Brick Wall Patterns |
| 913: Joana and the Odd Numbers | 924: Spreading The News | 929: Number Maze |
| 948: Fibonaccimal Base | 993: Product of digits | 1124: Celebrity jeopardy |
| 1149: Dangerous Dive | 1152: 4 Values whose Sum is 0 | 1203: Argus |
| 1225: Digit Counting | 1230: MODEX | 1237: Expert Enough? |
| 1260: Sales | 1339: Ancient Cipher | 1368: DNA Consensus String |
| 1374: Power Transmission | 1451: Ghostbusters 2 | 1471: Dangerous Dive |
| 1583: Digital Roots | 1584: Mathematics | 1585: Score |
| 1586: Molar Mass | 1587: Box | 1588: War |
| 1589: Partitioning | 1590: Elevator | 1592: Transmission |
| 1593: Pipes | 1594: Diamond | 1595: One Liner |
| 1604: Jumping Champion | 1605: Fibonacci Sum | 1606: Candy |
| 1607: Kaprekar Numbers | 1608: Random Walk | 1609: Look-and-say sequence |
| 10000: Longest Paths | 10003: Cutting Sticks | 10004: Bicoloring |
| 10006: Carmichael Numbers | 10008: What's Cryptanalysis? | 10010: Where's Waldorf? |
| 10012: How Big Is It? | 10013: Super long sums | 10014: Simple Base Conversion |
| 10018: Reverse and Add | 10019: Funny Encryption Method | 10025: The Game of MasterMind |
| 10026: Shoemaker's Problem | 10033: Billiard | 10034: Freckles |
| 10035: Primary Arithmetic | 10036: Divisibility | 10038: Jolly Jumpers |
| 10041: Vito's Family | 10042: Smith Numbers | 10047: The Monocycle |
| 10048: Audiophobia | 10050: Hartals | 10054: The Necklace |
| 10055: Hashmat the Brave Warrior | 10056: What is the Probability? | 10061: How to solve the cryptarithm? |
| 10062: Tell me the frequencies! | 10066: The Twin Towers | 10067: Playing with Wheels |
| 10070: Leap Year or Not Leap Year and ... | 10071: Back to High School Physics | 10074: Take the Land |
| 10077: The Stern-Brocot Number System | 10079: Pizza Cutting | 10082: WERTYU |
| 10098: Generating Fast | 10099: The Tourist Guide | 10101: Bangla Numbers |
| 10102: The path in the colored field | 10104: Euclid Problem | 10105: Polynomial Coefficients |
| 10106: Product | 10107: What is the Median? | 10110: Light, more light |
| 10112: Myacron Lifetime Achievement Award | 10114: Loansome Car Buyer | 10115: Automatic Editing |
| 10116: Robot Motion | 10123: Snowball Fight! | 10125: Sumsets |
| 10127: On a Diet | 10129: Play on Words | 10130: SuperSale |
| 10131: Is Bigger Smarter? | 10137: The Trip | 10139: Factovisors |
| 10140: Prime Distance | 10141: Request for Proposal | 10152: ShellSort |
| 10160: Servicing Stations | 10161: Ant on a Chessboard | 10167: Birthday Cake |
| 10168: Summation of Four Primes | 10170: The Hotel with Infinite Rooms | 10177: Magic Square Palindromes |
| 10179: Irreducible Basic Fractions | 10183: How many Fibs? | 10189: Minesweeper |
| 10190: Divide, But Not Quite Conquer! | 10191: Longest Nap | 10192: Vacation |
| 10193: All You Need Is Love | 10194: Football (aka Soccer) | 10195: The Knights Of The Round Table |
| 10198: Counting | 10199: Tourist Guide | 10205: Stack 'em Up |
| 10209: Is This Integration? | 10219: Find the ways! | 10220: I Love Big Numbers! |
| 10221: Two-Three Move | 10222: Decode the Message | 10226: Hardwood Species |
| 10229: Modular Fibonacci | 10235: Simply Emirp | 10242: Fourth Point !! |
| 10245: The Closest Pair Problem | 10250: The Other Two Trees | 10252: Common Permutation |
| 10258: Contest Scoreboard | 10260: Soundex | 10267: Graphical Editor |
| 10276: Hanoi Tower Troubles Again! | 10281: Average Speed | 10282: Babelfish |
| 10285: Longest Run on a Snowboard | 10286: Trouble with a Pentagon | 10295: Hay Points |
| 10298: Power Strings | 10299: Relatives | 10300: Ecological Premium |
| 10302: Summation of Polynomials | 10305: Ordering Tasks | 10310: Dog and Gopher |
| 10323: Factorial! You Must be Kidding!!! | 10324: Zeros and Ones | 10327: Flip Sort |
| 10334: Ray Through Glasses | 10336: Rank the Languages | 10338: Mischievous Children |
| 10340: All in All | 10341: Solve It | 10344: 23 out of 5 |
| 10346: Peter's Smokes | 10347: Medians | 10361: Automatic Poetry |
| 10369: Arctic Network | 10370: Above Average | 10387: Billiard Balls |
| 10391: Compound Words | 10392: Factoring Large Numbers | 10394: Twin Primes |
| 10397: Connect the Campus | 10405: Longest Common Subsequence | 10409: Die Game |
| 10420: List of Conquests | 10424: Love Calculator | 10432: Warehouse |
| 10450: World Cup Noise | 10452: Marcus | 10465: Homer Simpson |
| 10469: To Carry or not to Carry | 10473: Climbing Trees | 10474: The Candyman Can |
| 10487: Closest Sums | 10494: If We Were a Child Again | 10496: Collecting Beepers |
| 10499: Big Big Real Numbers | 10515: Power Sum | 10523: Very Easy !!! |
| 10530: Guessing Game | 10533: Digit Primes | 10534: Wavio Sequence |
| 10550: Combination Lock | 10557: XYZZY | 10562: Undraw the Trees |
| 10579: Fibonacci Numbers | 10583: Ubiquitous Religions | 10591: Happy Numbers |
| 10596: Deep Down Below | 10600: ACM Contest and Blackout | 10603: The Experimental Library |
| 10608: Friends | 10611: The Playboy Chimp | 10616: Divisible Group Sums |
| 10653: Bombs! NO they are Mines!! | 10656: Maximum Sum (II) | 10664: Luggage |
| 10673: Play with Floor and Ceil | 10679: I Love Strings!! | 10684: The jackpot |
| 10696: f91 | 10699: Count the factors | 10703: Free spots |
| 10719: Quirky Quantifiers | 10763: Foreign Exchange | 10773: Back to Intermediate Math |
| 10783: Odd Sum | 10784: Diagonal | 10785: Speed limit |
| 10789: Primo Words | 10790: How many points of intersection? | 10810: Ultra-QuickSort |
| 10812: Beat the Spread! | 10815: Andy's First Dictionary | 10878: Decode the tape |
| 10879: Maximum Sum (II) | 10905: Children's Game | 10911: Forming Quiz Teams |
| 10916: Factstone Benchmark | 10921: Find the Telephone | 10922: 2520 |
| 10924: Simple Minded Hashing | 10929: You can say 11 | 10931: Parity |
| 10935: Throwing cards away I | 10940: Throwing cards away II | 10943: How do you add? |
| 10945: Mother bear | 10948: The primary problem | 10954: Add All |
| 10963: The Swallowing Ground | 10970: Big Chocolate | 10976: Fractions Again?! |
| 10986: Sending email | 11000: Bee | 11044: Searching for Nessy |
| 11054: Wine trading in Gergovia | 11057: Exact Sum | 11059: Maximum Product |
| 11060: Beverages | 11085: Back to the 8-Queens | 11093: Just Finish it up |
| 11094: Continents | 11111: Generalized Matrioshkas | 11134: Fabled Rooks |
| 11137: Triple Fat Ladies | 11150: Cola | 11151: Longest Palindrome |
| 11152: Colourful Flowers | 11172: Relational Operator | 11185: Ternary |
| 11192: No Problem! | 11205: The broken pedometer | 11212: Editing a Book |
| 11214: Aladdin and the Flying Carpet | 11219: How Old Are You? | 11231: Black and white painting |
| 11234: Expressions | 11235: Frequent Values | 11244: Counting Stars |
| 11286: Conformity | 11292: Dragon of Loowater | 11332: Summing Digits |
| 11340: Newspaper | 11349: Symmetric Matrix | 11362: Phone List |
| 11364: Parking | 11369: Shopaholic | 11388: GCD LCM |
| 11389: The Bus Driver Problem | 11417: GCD | 11428: Cubes |
| 11450: Wedding Shopping | 11455: Behold my quadrangle | 11461: Square Numbers |
| 11462: Age Sort | 11479: Is this the easiest problem? | 11494: Queen |
| 11498: Division of Nlogonia | 11503: Virtual Friends | 11504: Dominos |
| 11530: SMS Typing | 11541: Decoding | 11547: Automatic Answer |
| 11559: Event Planning | 11565: Simple Equations | 11572: Unique Snowflakes |
| 11577: Letter Frequency | 11586: Train Tracks | 11608: No Problem! |
| 11614: Etruscan Warriors Never Play Chess | 11624: Fire! | 11631: Dark roads |
| 11636: Hello World! | 11650: Mirror Clock | 11661: Airport |
| 11677: Alarm Clock | 11679: Sub-prime | 11689: Soda Surpler |
| 11713: Abstract Names | 11715: Car | 11716: Digital Fortress |
| 11723: Numbering Roads | 11727: Cost Cutting | 11729: Commando War |
| 11734: Big Number of Teams will Solve This | 11743: Credit Check | 11764: Jumping Mario |
| 11777: Automate the Grades | 11799: Horror Dash | 11805: Bafana Bafana |
| 11809: Floating Point Numbers | 11827: Maximum GCD | 11831: Sticker Collector Robot |
| 11849: CD | 11854: Egypt | 11875: Brick Game |
| 11877: The Coco-Cola Store | 11879: Multiple of 17 | 11900: Boiled Eggs |
| 11933: Splitting Numbers | 11934: Magic Formula | 11936: The Lazy Lumberjacks |
| 11942: Lumberjack Sequencing | 11953: Battleships | 11984: A Change in Thermal Unit |
| 11988: Broken Keyboard (a.k.a. Beiju Text) | 11991: Easy Problem from Rujia Liu? | 11995: I Can Guess the Data Structure! |
| 12015: Google is Feeling Lucky | 12032: The Monkey and the Oiled Bamboo | 12096: The SetStack Computer |
| 12100: Printer Queue | 12107: One-Two-Three | 12108: Extraordinarily Tired Students |
| 12113: Sum of Different Primes | 12149: Feynman | 12157: Tariff Plan |
| 12174: Assemble | 12219: Searching Quickly | 12250: Language Detection |
| 12279: Emoogle Balance | 12289: One-Two-Three | 12325: Exact Change |
| 12333: Where is the Marble? | 12372: Packing for Holiday | 12403: Save Setu |
| 12405: Scarecrow | 12412: A Problem of Miscommunication | 12455: Bars |
| 12468: Zapping | 12478: Hardest Problem Ever (easy) | 12502: Three Families |
| 12503: Robot Instructions | 12504: Updating a Dictionary | 12545: Bits and Pieces |
| 12554: A Child’s Play | 12558: Cycle Finding | 12569: Sale |
| 12577: Hajj-e-Akbar | 12578: 10:6:2 | 12627: Error Correction |
| 12646: Majority Decision | 12657: Boxes in a Line |
| Q1 | Q2 | Q3 |
|---|---|---|
| 1003A: Polycarp's Pockets | 1030A: In Search of an Easy Problem | 1077A: Frog Jumping |
| 1092B: Teams Forming | 1095A: Repeating Cipher | 1097A: Gennady and a Card Game |
| 110A: Nearly Lucky Number | 112A: Petya and Strings | 1154A: Restoring Three Numbers |
| 115A: Party | 116A: Tram | 1183A: Nearest Interesting Number |
| 1186A: Vus the Cossack and a Contest | 118A: String Task | 1196A: Three Piles of Candies |
| 119A: Epic Game | 1206B: Make Product Equal One | 1220A: Cards |
| 122A: Lucky Division | 1234A: Equalize Prices Again | 124A: The Number of Positions |
| 1256A: Payment Without Change | 1283A: Minutes Before the New Year | 1285A: Mezo Playing Zoma |
| 1294A: Collecting Coins | 1294C: Product of Three Numbers | 1296A: Array with Odd Sum |
| 1296B: Food Buying | 1303A: Erasing Zeroes | 1304A: Two Rabbits |
| 1311A: Add Odd or Subtract Even | 1312A: Two Regular Polygons | 131A: cAPS lOCK |
| 1324A: Yet Another Tetris Problem | 1324B: Yet Another Palindrome Problem | 1324C: Frog Jumps |
| 1325A: EhAb AnD gCd | 1325B: CopyCopyCopyCopyCopy | 1326A: Bad Ugly Numbers |
| 1326B: Maximums | 1327A: Sum of Odd Integers | 1328A: Divisibility Problem |
| 1328B: K-th Beautiful String | 1328C: Ternary XOR | 1333A: Little Artem |
| 1334B: Middle Class | 1335A: Candies and Two Sisters | 1335B: Fair Division |
| 1335C: Hidden Word | 1335D: Anti-Sudoku | 1337A: Ichihime and Triangle |
| 1337B: Kana and Dragon Quest game | 1339A: Filling Diamonds | 1339B: Sorted Adjacent Differences |
| 133A: HQ9+ | 1341A: Nastya and Rice | 1342A: Road To Zero |
| 1342B: Binary Period | 1343A: Candies | 1343B: Balanced Array |
| 1343C: Alternating Subsequence | 1345A: Hilbert's Hotel | 1345B: Card Constructions |
| 1348A: Phoenix and Balance | 1350A: Orac and Factors | 1352A: Sum of Round Numbers |
| 1352B: Same Parity Summands | 1352C: K-th Not Divisible by n | 1353A: Most Unstable Array |
| 1353B: Number of Apartments | 1353C: Board Moves | 1354A: Alarm Clock |
| 1354B: Ternary String | 1355A: Sequence with Digits | 1355B: Young Explorers |
| 1358A: Park Lighting | 1358B: Maria Breaks the Self-isolation | 1359A: Berland Poker |
| 1359B: New Theatre Square | 1360A: Minimal Square | 1360B: Honest Coach |
| 1360C: Similar Pairs | 1360D: Buying Shovels | 1363A: Odd Selection |
| 1365A: Matrix Game | 1365B: Trouble Sort | 1366A: Shovels and Swords |
| 1367A: Short Substrings | 1367B: Even Array | 1368A: C+= |
| 1369A: FashionabLee | 1369B: AccurateLee | 136A: Presents |
| 1370A: Maximum GCD | 1371A: Magical Sticks | 1372A: Omkar and Password |
| 1372B: Omkar and Last Class of Math | 1373A: Donut Shops | 1373B: Balanced Tunnel |
| 1374A: Required Remainder | 1374B: Multiply by 2, divide by 6 | 1374C: Move Brackets |
| 1382A: Common Subsequence | 1382B: Sequential Nim | 1385A: Three Pairwise Maximums |
| 1385B: Restore the Permutation by Merger | 1385C: Make It Good | 1388A: Captain Flint and Crew Recruitment |
| 1389A: LCM Problem | 1391A: Suborray | 1391B: Fix You |
| 1397A: Juggling Letters | 1398A: Bad Triangle | 1398B: Substrings Sort |
| 1399A: Remove Smallest | 1399B: Gifts Fixing | 1399C: Boats Competition |
| 1400A: String Similarity | 1401A: Distance and Axis | 1409A: Yet Another Two Integers Problem |
| 1409B: Minimum Product | 141A: Amusing Joke | 1426A: Floor Number |
| 1433A: Boring Apartments | 1433B: Yet Another Bookshelf | 1433C: Dominant Piranha |
| 1436A: Reorder | 144A: Arrival of the General | 1451A: Subtract or Divide |
| 1454A: Special Permutation | 1454B: Unique Bid Auction | 1455A: Strange Functions |
| 1462A: Favorite Sequence | 1462B: Last Year's Substring | 1462C: Unique Number |
| 1466A: Bovine Dilemma | 1467A: Wizard of Orz | 1469A: Regular Bracket Sequence |
| 1472A: Cards for Friends | 1472B: Fair Division | 1472C: Long Jumps |
| 1473A: Replacing Elements | 1473B: String LCM | 1474A: Puzzle From the Future |
| 1475A: Odd Divisor | 1475B: New Year's Number | 1476A: K-divisible Sum |
| 1478A: Nezzar and Colorful Balls | 1480A: Yet Another String Game | 1481A: Space Navigation |
| 1486A: Shifting Stacks | 1487A: Arena | 148A: Insomnia cure |
| 1490A: Dense Array | 1490B: Balanced Remainders | 1490C: Sum of Cubes |
| 1497A: Meximization | 149A: Business trip | 1506A: Strange Table |
| 1509A: Average Height | 1512A: Spy Detected! | 1512B: Almost Rectangle |
| 1514A: Perfectly Imperfect Array | 1516A: Tit for Tat | 1517A: Sum of 2050 |
| 1519A: Red and Blue Beans | 1519B: The Cake Is a Lie | 151A: Soft Drinking |
| 1520A: Do Not Be Distracted! | 1520B: Ordinary Numbers | 1520C: Not Adjacent Matrix |
| 1520D: Same Differences | 1521A: Spy Syndrome 2 | 1525A: Potion-making |
| 1526A: Mean Inequality | 1527A: And Then There Were K | 1529A: In Game Theory |
| 1535A: Fair Playoff | 1535B: Array Reodering | 1537A: Arithmetic Array |
| 1537B: Bad Boy | 1538A: Stone Game | 1538B: Friends and Gifts |
| 1541A: Pretty Permutations | 1542A: Odd Set | 1547A: Shortest Path with Obstacle |
| 1547B: Alphabetical Strings | 1549A: Gregor and the Pawn Game | 1550A: Find The Array |
| 1551A: Polycarp and Coins | 1551B1: Wonderful Coloring - 1 | 1552A: Subsequence Addition |
| 1553A: Digits Sum | 1554A: Cherry | 1555A: PizzaForces |
| 1557A: Ezzat and Two Subsequences | 155A: I_love_%username% | 1560A: Dislike of Threes |
| 1560B: Who's Opposite? | 1560C: Infinity Table | 1562A: The Great Hero |
| 1567A: Domino Disaster | 1569A: The Raising Sand | 1579A: Casimir's String Solitaire |
| 1582A: Luntik and Concerts | 1582B: Luntik and Subsequences | 1582C: Luntik and Subsequences |
| 1585A: Pretty Permutations | 1585B: Find The Array | 1585C: Wonderful Coloring - 1 |
| 158A: Next Round | 158B: Taxi | 1593A: Casimir's String Solitaire |
| 1607A: Dislike of Threes | 1608A: Luntik and Concerts | 1608B: Luntik and Subsequences |
| 1609A: Domino Disaster | 1609B: Infinity Table | 1609C: The Great Hero |
| 160A: Luntik and Subsequences | 1610A: Pretty Permutations | 1610B: Find The Array |
| 1610C: Wonderful Coloring - 1 | 1611A: Next Round | 1612A: Taxi |
| 1612B: Casimir's String Solitaire | 1612C: Dislike of Threes | 1613A: Luntik and Concerts |
| 1613B: Luntik and Subsequences | 1613C: Domino Disaster | 1614A: Infinity Table |
| 1614B: The Great Hero | 1614C: Luntik and Subsequences | 1615A: Pretty Permutations |
| 1615B: Find The Array | 1615C: Wonderful Coloring - 1 | 1616A: Next Round |
| 1616B: Taxi | 1616C: Casimir's String Solitaire | 1617A: Dislike of Threes |
| 1617B: Luntik and Concerts | 1617C: Luntik and Subsequences | 1618A: Domino Disaster |
| 1618B: Infinity Table | 1618C: The Great Hero | 1618D: Luntik and Subsequences |
| 1619A: Pretty Permutations | 1619B: Find The Array | 1619C: Wonderful Coloring - 1 |
| 1620A: Next Round | 1620B: Taxi | 1620C: Casimir's String Solitaire |
| 1621A: Dislike of Threes | 1621B: Luntik and Concerts | 1622A: Luntik and Subsequences |
| 1622B: Domino Disaster | 1622C: Infinity Table | 1623A: The Great Hero |
| 1623B: Luntik and Subsequences | 1623C: Pretty Permutations | 1624A: Find The Array |
| 1627A: Wonderful Coloring - 1 | 1627B: Next Round | 1669A: Taxi |
| 1676A: Casimir's String Solitaire | 1692A: Dislike of Threes | 1703A: Luntik and Concerts |
| 1742A: Luntik and Subsequences | 1763A: Domino Disaster | 189A: Infinity Table |
| 1902A: The Great Hero | 1902B: Luntik and Subsequences | 1902C: Pretty Permutations |
| 1902D: Find The Array | 1902E: Wonderful Coloring - 1 | 1902F: Next Round |
| 1907A: Taxi | 1907B: Casimir's String Solitaire | 1907C: Dislike of Threes |
| 1915A: Luntik and Concerts | 1915B: Luntik and Subsequences | 1915C: Domino Disaster |
| 1915D: Infinity Table | 1915E: The Great Hero | 1915F: Luntik and Subsequences |
| 1916A: Pretty Permutations | 1916B: Find The Array | 1916C: Wonderful Coloring - 1 |
| 1917A: Next Round | 1917B: Taxi | 1917C: Casimir's String Solitaire |
| 1917D: Dislike of Threes | 1A: Theatre Square | 200B: Drinks |
| 208A: Dubstep | 214A: System of Equations | 228A: Is your horseshoe on the other hoof? |
| 230A: Dragons | 230B: T-primes | 231A: Team |
| 233A: Perfect Permutation | 236A: Boy or Girl | 255A: Greg's Workout |
| 25A: IQ test | 263A: Beautiful Matrix | 265A: Colorful Stones (Simplified Edition) |
| 266A: Stones on the Table | 266B: Queue at the School | 268A: Games |
| 268B: Buttons | 270A: Fancy Fence | 271A: Beautiful Year |
| 279B: Books | 281A: Word Capitalization | 282A: Bit++ |
| 313A: Ilya and Bank Account | 313B: Ilya and Queries | 318A: Even Odds |
| 320A: Magic Numbers | 327A: Flipping Game | 32B: Borze |
| 330A: Cakeminator | 337A: Puzzles | 339A: Helpful Maths |
| 339B: Xenia and Ringroad | 344A: Magnets | 349A: Cinema Line |
| 34B: Sale | 358A: Dima and Continuous Line | 358B: Dima and a Bad X |
| 361A: Levko and Table | 363A: Soroban | 363B: Fence |
| 363C: Pashmak and Garden | 368B: Sereja and Suffixes | 369A: Valera and Plates |
| 369B: Valera and Contest | 379A: New Year Candles | 381A: Sereja and Dima |
| 405A: Gravity Flip | 41A: Translation | 427A: Police Recruits |
| 431A: Black Square | 432A: Choosing Teams | 433B: Kuriyama Mirai's Stones |
| 439A: Devu, the Singer and Churu, the Joker | 43A: Football | 443A: Anton and Letters |
| 448A: Rewards | 451A: Game With Sticks | 451B: Sort the Array |
| 455A: Boredom | 456A: Laptops | 459A: Pashmak and Garden |
| 459B: Pashmak and Flowers | 460A: Vasya and Socks | 466A: Cheap Travel |
| 466C: Number of Ways | 467A: George and Accommodation | 467B: Fedor and New Game |
| 469A: I Wanna Be the Guy | 472A: Design Tutorial: Learn from Math | 474A: Keyboard |
| 474B: Worms | 476A: Dreamoon and Stairs | 476B: Dreamoon and WiFi |
| 478A: Initial Bet | 478B: Random Teams | 479A: Expression |
| 479C: Exams | 486A: Calculating Function | 489B: BerSU Ball |
| 489C: Given Length and Sum of Digits... | 490A: Team Olympiad | 492A: Vanya and Cubes |
| 492B: Vanya and Lanterns | 499B: Lecture | 4A: Watermelon |
| 4C: Registration System | 500A: New Year Transportation | 509A: Maximum in Table |
| 50A: Domino piling | 510A: Fox And Snake | 514A: Chewbaсca and Number |
| 519B: A and B and Compilation Errors | 520A: Pangram | 520B: Two Buttons |
| 540A: Combination Lock | 546A: Soldier and Bananas | 550A: Two Substrings |
| 556A: Case of the Zeros and Ones | 567A: Lineland Mail | 577A: Multiplication Table |
| 579A: Raising Bacteria | 580A: Kefa and First Steps | 580C: Kefa and Park |
| 581A: Vasya the Hipster | 584A: Olesya and Rodion | 58A: Chat room |
| 599A: Patrick and Shopping | 59A: Word | 617A: Elephant |
| 61A: Ultra-Fast Mathematician | 630A: Again Twenty Five! | 677A: Vanya and Fence |
| 686A: Free Ice Cream | 688B: Lovely Palindromes | 69A: Young Physicist |
| 702A: Maximum Increase | 703A: Mishka and Game | 705A: Hulk |
| 706B: Interesting drink | 707A: Brain's Photos | 711A: Bus to Udayland |
| 71A: Way Too Long Words | 723A: The New Year: Meeting Friends | 731A: Night at the Museum |
| 732A: Buy a Shovel | 732B: Cormen — The Best Friend Of a Man | 734A: Anton and Danik |
| 734B: Anton and Digits | 742A: Arpa’s hard exam and Mehrdad’s naive cheat | 749A: Bachgold Problem |
| 750A: New Year and Hurry | 758A: Holiday Of Equality | 766B: Mahmoud and a Triangle |
| 785A: Anton and Polyhedrons | 791A: Bear and Big Brother | 80A: Panoramix's Prediction |
| 822A: I'm bored with life | 82A: Double Cola | 894A: QAQ |
| 935A: Fafa and his Company | 959A: Mahmoud and Ehab and the even-odd game | 96A: Football |
| 977A: Wrong Subtraction | 977B: Two-gram | 978B: File Name |
| 996A: Hit the Lottery | 9A: Die Roll | CF1511A: Odd Divisor |
"If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is." – John von Neumann