The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Topological Sort in all languages in bytes. 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 Bytes Time Submitted 241st jatloe 554 162 15ms 1 Sep 2025 242nd olleicua 🇺🇸 552 104 59ms 5 Aug 2025 243rd Shanethegamer 🇺🇸 551 102 20ms 9 Aug 2025 243rd albanian-laundromat 551 102 2,136ms 24 Sep 2025 245th shelerr 551 163 1,535ms 21 Aug 2025 246th albanian-laundromat 548 183 133ms 30 Oct 2025 247th jared-hughes 544 151 14ms 13 Oct 2025 248th AlephSquirrel 540 199 629ms 2 Aug 2025 249th albanian-laundromat 539 569 56ms 16 days ago 250th moustave 531 169 29ms 19 Aug 2025 251st tailorspy 530 282 3,035ms 12 Aug 2025 252nd CaedenHarper 🇨🇦 529 387 319ms 17 Nov 2025 253rd KatieLG 🇬🇧 527 149 624ms 22 Sep 2025 254th snoozingnewt 🇨🇦 523 337 283ms 23 Nov 2025 255th blaztoma 🇱🇹 522 264 155ms 23 days ago 256th Lv0Sys 🇵🇱 519 173 14ms 9 days ago 257th yjgnaw 516 174 16ms 24 Jul 2025 258th DanielVenable 515 221 199ms 3 Aug 2025 259th qpwoeirut 513 175 38ms 2 Aug 2025 260th Yax42 🇫🇷 510 161 261ms 6 Sep 2025 261st jacekwladzinski 493 182 25ms 7 Oct 2025 262nd RaBa21 🇭🇺 488 184 20ms 3 Aug 2025 262nd Mikey-Beep 🇬🇧 488 184 26ms 6 Aug 2025 264th albanian-laundromat 487 209 102ms 29 Sep 2025 265th targrik 486 206 10ms 18 Aug 2025 266th Artemis21 🇬🇧 480 187 72ms 14 days ago 267th Ripick 478 161 1,009ms 6 Aug 2025 268th voytxt 🇨🇿 478 519 604ms 25 Jul 2025 269th albanian-laundromat 469 319 1,230ms 29 Oct 2025 270th Mikey-Beep 🇬🇧 465 264 22ms 12 Aug 2025 271st OllieBoyne 🇬🇧 449 200 15ms 9 days ago 272nd guilhem-roy 🇫🇷 442 203 18ms 22 Nov 2025 273rd MeWhenI 🇻🇦 439 92 47ms 22 days ago 274th h3ra993huskp 🇯🇵 439 341 819ms 21 days ago 275th iczelia 🇩🇪 433 263 220ms 19 Oct 2025 276th Bulmenisaurus 432 208 126ms 26 Oct 2025 277th retrohun 430 94 1,096ms 1 Aug 2025 278th MeWhenI 🇻🇦 428 170 1,009ms 15 Sep 2025 279th LukeBridges 🇬🇧 428 192 12ms 19 Aug 2025 280th RobertBurs 423 212 19ms 24 Sep 2025 280th klixel 🇨🇦 423 212 103ms 25 Oct 2025 282nd DialFrost 🇸🇬 417 359 472ms 19 Nov 2025 283rd tatzyr 🇯🇵 416 138 52ms 12 Aug 2025 284th madex 🇩🇪 413 427 252ms 2 Aug 2025 285th CatsAreFluffy 410 219 21ms 30 Oct 2025 286th helbling 🇨🇭 405 203 13ms 8 Aug 2025 287th SB-945 404 222 20ms 1 Aug 2025 288th Lv0Sys 🇵🇱 396 145 58ms 9 days ago 289th alemelis 395 195 1,133ms 5 Aug 2025 290th FlorianCassayre 🇫🇷 379 237 15ms 5 Aug 2025 290th mbittner20 379 237 15ms 18 Aug 2025 292nd emgordon154 377 152 62ms 18 Nov 2025 293rd KatieLG 🇬🇧 375 153 131ms 18 Aug 2025 294th HumanoidCPU 374 240 21ms 26 Jul 2025 295th scpchicken 🇵🇼 369 243 18ms 14 Aug 2025 296th DialFrost 🇸🇬 366 240 416ms 11 hours ago 297th DialFrost 🇸🇬 362 248 15ms 10 Jul 2025 298th Shotokhan 359 250 18ms 24 Sep 2025 299th CaedenHarper 🇨🇦 358 203 1,156ms 27 Sep 2025 300th H3XDaemon 358 251 15ms 19 Aug 2025 301st Babafaba 351 256 21ms 3 Nov 2025 302nd MeWhenI 🇻🇦 343 193 946ms 26 days ago 303rd gigaprofisi 🇺🇸 342 240 12ms 6 Aug 2025 304th HumanoidCPU 340 231 708ms 26 Jul 2025 305th Upload-and-View 🇺🇦 340 264 19ms 16 Aug 2025 305th dokutan 340 264 14ms 18 Aug 2025 307th jameswmccarty 336 267 19ms 10 Aug 2025 308th madeforlosers 331 248 12ms 25 Aug 2025 309th madex 🇩🇪 330 272 15ms 2 Aug 2025 310th tomh1012 319 366 453ms 11 Aug 2025 311th Babafaba 318 247 839ms 29 Oct 2025 312th dokutan 311 253 653ms 28 Aug 2025 313th Jacob385 300 500 661ms 1 Sep 2025 314th KatieLG 🇬🇧 299 586 153ms 2 Aug 2025 315th msbranicky 290 309 18ms 12 Aug 2025 316th luuumine 🇫🇷 289 311 16ms 11 days ago 317th CaedenHarper 🇨🇦 285 288 14ms 29 Aug 2025 318th robin-scragg 274 327 16ms 13 Nov 2025 319th jediroberthatch 272 330 17ms 1 Aug 2025 320th nstearns96 🇬🇧 262 343 17ms 8 Aug 2025 First Prev 241–320 of 345 Next Last