The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Topological Sort in all languages in chars. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 241st DanielVenable 515 221 199ms 3 Aug 2025 242nd SB-945 511 136 17ms 1 Aug 2025 243rd Yax42 🇫🇷 510 161 261ms 6 Sep 2025 244th annaproxy 507 137 18ms 5 Sep 2025 244th FortuiteMan 🇫🇷 507 137 18ms 23 days ago 246th andrewjc2000 496 140 17ms 2 Aug 2025 246th hiichbindermax 496 140 16ms 4 Aug 2025 248th MeWhenI 🇻🇦 492 128 580ms 16 Nov 2025 249th CaedenHarper 🇨🇦 486 143 17ms 3 Oct 2025 250th targrik 486 206 10ms 18 Aug 2025 251st HumanoidCPU 479 145 22ms 26 Jul 2025 252nd voytxt 🇨🇿 478 519 604ms 25 Jul 2025 253rd InigoK 🇺🇸 476 146 16ms 3 Sep 2025 254th albanian-laundromat 469 319 1,230ms 29 Oct 2025 255th Mikey-Beep 🇬🇧 465 264 22ms 12 Aug 2025 256th YAJUE114514 460 151 15ms 1 Aug 2025 256th vgamula 🇺🇦 460 151 17ms 4 Aug 2025 258th Ripick 458 161 1,009ms 6 Aug 2025 259th CaedenHarper 🇨🇦 453 139 462ms 3 Oct 2025 260th HumanoidCPU 446 141 413ms 26 Jul 2025 261st error256 446 189 186ms 7 Aug 2025 262nd dokutan 443 157 14ms 28 Aug 2025 263rd alemelis 440 158 16ms 2 Aug 2025 263rd dirckvdende 440 158 17ms 4 Aug 2025 263rd cros107 🇦🇺 440 158 17ms 12 Aug 2025 266th MeWhenI 🇻🇦 439 92 47ms 19 days ago 267th h3ra993huskp 🇯🇵 439 341 819ms 18 days ago 268th iczelia 🇩🇪 433 263 220ms 19 Oct 2025 269th retrohun 430 94 1,096ms 1 Aug 2025 270th jatloe 429 162 15ms 1 Sep 2025 271st MeWhenI 🇻🇦 428 170 1,009ms 15 Sep 2025 272nd LukeBridges 🇬🇧 428 192 12ms 19 Aug 2025 273rd shelerr 426 163 1,535ms 21 Aug 2025 274th DialFrost 🇸🇬 417 359 472ms 19 Nov 2025 275th madex 🇩🇪 413 427 252ms 2 Aug 2025 276th moustave 411 169 29ms 19 Aug 2025 277th helbling 🇨🇭 405 203 13ms 8 Aug 2025 278th Lv0Sys 🇵🇱 402 173 14ms 6 days ago 279th dokutan 401 157 404ms 28 Aug 2025 280th JOrE20 🇺🇸 401 205 15ms 16 days ago 281st qpwoeirut 397 175 38ms 2 Aug 2025 282nd dokutan 392 144 59ms 2 Aug 2025 283rd Lv0Sys 🇵🇱 390 145 58ms 6 days ago 284th jacekwladzinski 382 182 25ms 7 Oct 2025 285th luuumine 🇫🇷 380 183 21ms 21 Oct 2025 286th Mikey-Beep 🇬🇧 378 184 26ms 6 Aug 2025 287th alemelis 378 195 1,133ms 5 Aug 2025 288th emgordon154 372 152 62ms 18 Nov 2025 289th Artemis21 🇬🇧 372 187 72ms 11 days ago 290th robin-scragg 368 189 22ms 13 Nov 2025 291st CaedenHarper 🇨🇦 358 203 1,156ms 27 Sep 2025 292nd OllieBoyne 🇬🇧 348 200 15ms 6 days ago 293rd MeWhenI 🇻🇦 343 193 946ms 23 days ago 294th guilhem-roy 🇫🇷 342 203 18ms 25 days ago 295th gigaprofisi 🇺🇸 342 240 12ms 6 Aug 2025 296th Bulmenisaurus 334 208 126ms 26 Oct 2025 297th madeforlosers 331 248 12ms 25 Aug 2025 298th RobertBurs 328 212 19ms 24 Sep 2025 298th klixel 🇨🇦 328 212 103ms 25 Oct 2025 300th tomh1012 319 366 453ms 11 Aug 2025 301st CatsAreFluffy 317 219 21ms 30 Oct 2025 302nd Jacob385 300 500 661ms 1 Sep 2025 303rd KatieLG 🇬🇧 299 586 153ms 2 Aug 2025 304th FlorianCassayre 🇫🇷 293 237 15ms 5 Aug 2025 304th mbittner20 293 237 15ms 18 Aug 2025 306th scpchicken 🇵🇼 286 243 18ms 14 Aug 2025 307th CaedenHarper 🇨🇦 285 288 14ms 29 Aug 2025 308th DialFrost 🇸🇬 280 248 15ms 10 Jul 2025 309th Shotokhan 278 250 18ms 24 Sep 2025 310th H3XDaemon 277 251 15ms 19 Aug 2025 311th Babafaba 272 256 21ms 3 Nov 2025 312th Upload-and-View 🇺🇦 263 264 19ms 16 Aug 2025 313th jameswmccarty 260 267 19ms 10 Aug 2025 314th madex 🇩🇪 256 272 15ms 2 Aug 2025 315th Babafaba 255 247 839ms 29 Oct 2025 316th CaedenHarper 🇨🇦 255 587 666ms 6 Oct 2025 317th didion0 🇺🇸 249 330 19ms 29 Aug 2025 318th iczelia 🇩🇪 239 235 9ms 19 Oct 2025 319th ndren 239 2,498 3,353ms 20 days ago 320th CaedenHarper 🇨🇦 238 490 438ms 16 Oct 2025 First Prev 241–320 of 341 Next Last