From 5b5fa6ebff4fa4ad64963ad7432f7ebf8a18cab5 Mon Sep 17 00:00:00 2001 From: Mohammad S Anwar Date: Mon, 9 Oct 2023 02:42:23 +0100 Subject: - Added template for week 238. --- challenge-238/0rir/README | 2 + challenge-238/2colours/README | 1 + challenge-238/3ter/README | 1 + challenge-238/LoneWolfiNTj/README | 1 + challenge-238/aaron-rowe/README | 1 + challenge-238/aaron-sherman/README | 1 + challenge-238/aaronreidsmith/README | 1 + challenge-238/abigail/README.md | 51 +++++ challenge-238/adam-russell/README | 1 + challenge-238/adherzog/README | 1 + challenge-238/adriaandens/README | 1 + challenge-238/aecepoglu/README | 3 + challenge-238/ailbhe-tweedie/README | 1 + challenge-238/alex-daniel/README | 1 + challenge-238/alexander-karelas/README | 1 + challenge-238/alexander-pankoff/README | 1 + challenge-238/alicia-bielsa/README | 1 + challenge-238/andinus/README | 69 ++++++ challenge-238/andreas-voegele/README | 1 + challenge-238/andrezgz/README | 1 + challenge-238/anton-fedotov/README | 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100644 index 0000000000..6894fbec08 --- /dev/null +++ b/challenge-238/2colours/README @@ -0,0 +1 @@ +Solution By Márton Polgár. diff --git a/challenge-238/3ter/README b/challenge-238/3ter/README new file mode 100644 index 0000000000..8c594431f3 --- /dev/null +++ b/challenge-238/3ter/README @@ -0,0 +1 @@ +Solutions by 3ter. diff --git a/challenge-238/LoneWolfiNTj/README b/challenge-238/LoneWolfiNTj/README new file mode 100755 index 0000000000..bf42ad2482 --- /dev/null +++ b/challenge-238/LoneWolfiNTj/README @@ -0,0 +1 @@ +Solution by Robbie Hatley (github user "LoneWolfiNTj"). \ No newline at end of file diff --git a/challenge-238/aaron-rowe/README b/challenge-238/aaron-rowe/README new file mode 100644 index 0000000000..e14e0782fb --- /dev/null +++ b/challenge-238/aaron-rowe/README @@ -0,0 +1 @@ +Solutions by Aaron Rowe. diff --git a/challenge-238/aaron-sherman/README b/challenge-238/aaron-sherman/README new file mode 100644 index 0000000000..14ec31f570 --- /dev/null +++ b/challenge-238/aaron-sherman/README @@ -0,0 +1 @@ +Solutions by Aaron Sherman. diff --git a/challenge-238/aaronreidsmith/README b/challenge-238/aaronreidsmith/README new file mode 100644 index 0000000000..2fcfe1fdcc --- /dev/null +++ b/challenge-238/aaronreidsmith/README @@ -0,0 +1 @@ +Solution by Aaron Smith diff --git a/challenge-238/abigail/README.md b/challenge-238/abigail/README.md new file mode 100644 index 0000000000..d9831f0606 --- /dev/null +++ b/challenge-238/abigail/README.md @@ -0,0 +1,51 @@ +# Solutions by Abigail + +## Part 1 + +* [AWK](awk/ch-1.awk) +* [Bash](bash/ch-1.sh) +* [C](c/ch-1.c) +* [Go](go/ch-1.go) +* [Java](java/ch-1.java) +* [Lua](lua/ch-1.lua) +* [Node.js](node/ch-1.js) +* [Pascal](pascal/ch-1.p) +* [Perl](perl/ch-1.pl) +* [Python](python/ch-1.py) +* [R](r/ch-1.r) +* [Ruby](ruby/ch-1.rb) +* [Tcl](tcl/ch-1.tcl) + + +## Part 2 + +* [AWK](awk/ch-2.awk) +* [Bash](bash/ch-2.sh) +* [Basic](basic/ch-2.bas) +* [bc](bc/ch-2.bc) +* [Befunge-93](befunge-93/ch-2.bf93) +* [C](c/ch-2.c) +* [Cobol](cobol/ch-2.cb) +* [Csh](csh/ch-2.csh) +* [Erlang](erlang/ch-2.erl) +* [Forth](forth/ch-2.fs) +* [Fortran](fortran/ch-2.f90) +* [Go](go/ch-2.go) +* [Java](java/ch-2.java) +* [Lua](lua/ch-2.lua) +* [M4](m4/ch-2.m4) +* [MMIX](mmix/ch-2.mms) +* [Node.js](node/ch-2.js) +* [OCaml](ocaml/ch-2.ml) +* [Pascal](pascal/ch-2.p) +* [Perl](perl/ch-2.pl) +* [PHP](php/ch-2.php) +* [PostScript](postscript/ch-2.ps) +* [Python](python/ch-2.py) +* [R](r/ch-2.r) +* [Rexx](rexx/ch-2.rexx) +* [Ruby](ruby/ch-2.rb) +* [Scheme](scheme/ch-2.scm) +* [sed](sed/ch-2.sed) +* [sql](sql/ch-2.sql) +* [Tcl](tcl/ch-2.tcl) diff --git a/challenge-238/adam-russell/README b/challenge-238/adam-russell/README new file mode 100644 index 0000000000..1d2e2957c5 --- /dev/null +++ b/challenge-238/adam-russell/README @@ -0,0 +1 @@ +Solution by Adam Russell diff --git a/challenge-238/adherzog/README b/challenge-238/adherzog/README new file mode 100644 index 0000000000..b59913be6c --- /dev/null +++ b/challenge-238/adherzog/README @@ -0,0 +1 @@ +Solutions by Adam Herzog. diff --git a/challenge-238/adriaandens/README b/challenge-238/adriaandens/README new file mode 100644 index 0000000000..60d4ec3943 --- /dev/null +++ b/challenge-238/adriaandens/README @@ -0,0 +1 @@ +Solutions by Adriaan Dens. diff --git a/challenge-238/aecepoglu/README b/challenge-238/aecepoglu/README new file mode 100644 index 0000000000..9e57c3a464 --- /dev/null +++ b/challenge-238/aecepoglu/README @@ -0,0 +1,3 @@ +Solution by AhmetEmre + +Solved live on twitch.tv/slippygoat diff --git a/challenge-238/ailbhe-tweedie/README b/challenge-238/ailbhe-tweedie/README new file mode 100644 index 0000000000..36d4034b70 --- /dev/null +++ b/challenge-238/ailbhe-tweedie/README @@ -0,0 +1 @@ +Solution by Ailbhe Tweedie diff --git a/challenge-238/alex-daniel/README b/challenge-238/alex-daniel/README new file mode 100644 index 0000000000..65550789bd --- /dev/null +++ b/challenge-238/alex-daniel/README @@ -0,0 +1 @@ +Solution by Alex Daniel. diff --git a/challenge-238/alexander-karelas/README b/challenge-238/alexander-karelas/README new file mode 100644 index 0000000000..3de9fce8d9 --- /dev/null +++ b/challenge-238/alexander-karelas/README @@ -0,0 +1 @@ +Solution by Alexander Karelas diff --git a/challenge-238/alexander-pankoff/README b/challenge-238/alexander-pankoff/README new file mode 100644 index 0000000000..41f67807ac --- /dev/null +++ b/challenge-238/alexander-pankoff/README @@ -0,0 +1 @@ +Solution by Alexander Pankoff diff --git a/challenge-238/alicia-bielsa/README b/challenge-238/alicia-bielsa/README new file mode 100644 index 0000000000..c5187874c3 --- /dev/null +++ b/challenge-238/alicia-bielsa/README @@ -0,0 +1 @@ +Solution by Alicia Beilsa. diff --git a/challenge-238/andinus/README b/challenge-238/andinus/README new file mode 100644 index 0000000000..ad1a4a32fa --- /dev/null +++ b/challenge-238/andinus/README @@ -0,0 +1,69 @@ + ━━━━━━━━━━━━━━━ + CHALLENGE 188 + + Andinus + ━━━━━━━━━━━━━━━ + + + 2022-10-27 + + + + + +1 Task 1 - Divisible Pairs +══════════════════════════ + + You are given list of integers @list of size $n and divisor $k. + + Write a script to find out count of pairs in the given list that + satisfies the following rules. + + The pair (i, j) is eligible if and only if a) 0 <= i < j < len(list) + b) list[i] + list[j] is divisible by k + + + ┌──── + │ Example 1 + │ Input: @list = (4, 5, 1, 6), $k = 2 + │ Output: 2 + │ + │ Example 2 + │ Input: @list = (1, 2, 3, 4), $k = 2 + │ Output: 2 + │ + │ Example 3 + │ Input: @list = (1, 3, 4, 5), $k = 3 + │ Output: 2 + │ + │ Example 4 + │ Input: @list = (5, 1, 2, 3), $k = 4 + │ Output: 2 + │ + │ Example 5 + │ Input: @list = (7, 2, 4, 5), $k = 4 + │ Output: 1 + └──── + + +1.1 Raku +──────── + + Go over all combinations of elements as per rules and check if their + sum is divisible by divisor. + + ┌──── + │ unit sub MAIN( + │ Int $divisor, *@list is copy where *.elems > 0 + │ ); + │ @list = @list>>.Int; + │ + │ my Int $pairs; + │ for 0 ... @list.end -> $i { + │ for $i ... @list.end -> $j { + │ next if $i == $j; + │ $pairs++ if (@list[$i] + @list[$j]) %% $divisor; + │ } + │ } + │ put $pairs; + └──── diff --git a/challenge-238/andreas-voegele/README b/challenge-238/andreas-voegele/README new file mode 100644 index 0000000000..da9f91b22a --- /dev/null +++ b/challenge-238/andreas-voegele/README @@ -0,0 +1 @@ +Solutions by Andreas Vögele. diff --git a/challenge-238/andrezgz/README b/challenge-238/andrezgz/README new file mode 100644 index 0000000000..f4fd0da88e --- /dev/null +++ b/challenge-238/andrezgz/README @@ -0,0 +1 @@ +Solution by Andrezgz diff --git a/challenge-238/anton-fedotov/README b/challenge-238/anton-fedotov/README new file mode 100644 index 0000000000..f7c4f6deed --- /dev/null +++ b/challenge-238/anton-fedotov/README @@ -0,0 +1 @@ +Solutions by Anton Fedotov. diff --git a/challenge-238/antonio-gamiz/README b/challenge-238/antonio-gamiz/README new file mode 100644 index 0000000000..1f5ed5871a --- /dev/null +++ b/challenge-238/antonio-gamiz/README @@ -0,0 +1 @@ +Solution by Antonio Gamiz diff --git a/challenge-238/ap29600/README b/challenge-238/ap29600/README new file mode 100644 index 0000000000..003f354c89 --- /dev/null +++ b/challenge-238/ap29600/README @@ -0,0 +1 @@ +Solutions by Andrea Piseri diff --git a/challenge-238/arne-sommer/README b/challenge-238/arne-sommer/README new file mode 100644 index 0000000000..b5d88e4df4 --- /dev/null +++ b/challenge-238/arne-sommer/README @@ -0,0 +1 @@ +Solution by Arne Sommer. diff --git a/challenge-238/arpad-toth/README b/challenge-238/arpad-toth/README new file mode 100644 index 0000000000..6661dd82c1 --- /dev/null +++ b/challenge-238/arpad-toth/README @@ -0,0 +1 @@ +Solution by Arpad Toth diff --git a/challenge-238/ash/README b/challenge-238/ash/README new file mode 100644 index 0000000000..318b1bfb41 --- /dev/null +++ b/challenge-238/ash/README @@ -0,0 +1 @@ +Solutions by Andrew Shitov diff --git a/challenge-238/asherbhs/README b/challenge-238/asherbhs/README new file mode 100644 index 0000000000..5c37138bd7 --- /dev/null +++ b/challenge-238/asherbhs/README @@ -0,0 +1 @@ +Solutions by Asher Harvey-Smith diff --git a/challenge-238/athanasius/README b/challenge-238/athanasius/README new file mode 100644 index 0000000000..cc357fda4a --- /dev/null +++ b/challenge-238/athanasius/README @@ -0,0 +1 @@ +Solution by Athanasius diff --git a/challenge-238/aubrey-quarcoo/README b/challenge-238/aubrey-quarcoo/README new file mode 100644 index 0000000000..8e63a2c1f5 --- /dev/null +++ b/challenge-238/aubrey-quarcoo/README @@ -0,0 +1 @@ +Solution by Aubrey Quarcoo diff --git a/challenge-238/aut0exec/README b/challenge-238/aut0exec/README new file mode 100644 index 0000000000..eaad94dcc6 --- /dev/null +++ b/challenge-238/aut0exec/README @@ -0,0 +1 @@ +Solution by Aut0exec diff --git a/challenge-238/avery-adams/README b/challenge-238/avery-adams/README new file mode 100644 index 0000000000..6aaa1f9308 --- /dev/null +++ b/challenge-238/avery-adams/README @@ -0,0 +1 @@ +Solutions by Avery Adams. diff --git a/challenge-238/aviral-goel/README b/challenge-238/aviral-goel/README new file mode 100644 index 0000000000..e64ee14512 --- /dev/null +++ b/challenge-238/aviral-goel/README @@ -0,0 +1 @@ +Solutions by Aviral Goel. diff --git a/challenge-238/barroff/README b/challenge-238/barroff/README new file mode 100644 index 0000000000..03cd0cea2e --- /dev/null +++ b/challenge-238/barroff/README @@ -0,0 +1 @@ +Solution by BarrOff. diff --git a/challenge-238/baryshevs/README b/challenge-238/baryshevs/README new file mode 100644 index 0000000000..61199ce0e4 --- /dev/null +++ b/challenge-238/baryshevs/README @@ -0,0 +1 @@ +Solutions by Baryshev Sergey. diff --git a/challenge-238/bejoy-mathews/README b/challenge-238/bejoy-mathews/README new file mode 100644 index 0000000000..475b1c4fe5 --- /dev/null +++ b/challenge-238/bejoy-mathews/README @@ -0,0 +1 @@ +Solutions by Bejoy Abraham Mathews. diff --git a/challenge-238/belmark-caday/README b/challenge-238/belmark-caday/README new file mode 100644 index 0000000000..6726590965 --- /dev/null +++ b/challenge-238/belmark-caday/README @@ -0,0 +1 @@ +Solutions by Belmark Caday. diff --git a/challenge-238/ben-davies/README.md b/challenge-238/ben-davies/README.md new file mode 100644 index 0000000000..77158344c9 --- /dev/null +++ b/challenge-238/ben-davies/README.md @@ -0,0 +1 @@ +Solution by Ben Davies diff --git a/challenge-238/bhat_gurunandan/README b/challenge-238/bhat_gurunandan/README new file mode 100644 index 0000000000..b5f27d302f --- /dev/null +++ b/challenge-238/bhat_gurunandan/README @@ -0,0 +1 @@ +Solution by Gurunandan Bhat diff --git a/challenge-238/bill-palmer/README b/challenge-238/bill-palmer/README new file mode 100644 index 0000000000..08ec849a41 --- /dev/null +++ b/challenge-238/bill-palmer/README @@ -0,0 +1 @@ +Solution by Bill Palmer. diff --git a/challenge-238/bkb/README b/challenge-238/bkb/README new file mode 100644 index 0000000000..4721993bb3 --- /dev/null +++ b/challenge-238/bkb/README @@ -0,0 +1 @@ +Solution by Ben Bullock. diff --git a/challenge-238/bob-kleemann/README b/challenge-238/bob-kleemann/README new file mode 100644 index 0000000000..78680e4035 --- /dev/null +++ b/challenge-238/bob-kleemann/README @@ -0,0 +1 @@ +Solution by Bob Kleemann diff --git a/challenge-238/bob-lied/README b/challenge-238/bob-lied/README new file mode 100644 index 0000000000..ca9b4d5e22 --- /dev/null +++ b/challenge-238/bob-lied/README @@ -0,0 +1,4 @@ +Solutions to weekly challenge 237 by Bob Lied + +https://perlweeklychallenge.org/blog/perl-weekly-challenge-237/ +https://github.com/boblied/perlweeklychallenge-club/tree/master/challenge-237/bob-lied diff --git a/challenge-238/brtastic/README b/challenge-238/brtastic/README new file mode 100644 index 0000000000..0fbe79fd6f --- /dev/null +++ b/challenge-238/brtastic/README @@ -0,0 +1 @@ +Solutions by Bartosz Jarzyna. diff --git a/challenge-238/brtastic/c/.gitignore b/challenge-238/brtastic/c/.gitignore new file mode 100644 index 0000000000..01f22977d8 --- /dev/null +++ b/challenge-238/brtastic/c/.gitignore @@ -0,0 +1,2 @@ +ch-1 + diff --git a/challenge-238/brtastic/pascal/.gitignore b/challenge-238/brtastic/pascal/.gitignore new file mode 100644 index 0000000000..7c16595d23 --- /dev/null +++ b/challenge-238/brtastic/pascal/.gitignore @@ -0,0 +1,3 @@ +*.o +ch-1 + diff --git a/challenge-238/bruce-gray/README b/challenge-238/bruce-gray/README new file mode 100644 index 0000000000..58a8668633 --- /dev/null +++ b/challenge-238/bruce-gray/README @@ -0,0 +1 @@ +Solutions by Bruce Gray diff --git a/challenge-238/bruno-ramos/README b/challenge-238/bruno-ramos/README new file mode 100644 index 0000000000..9d631dad8f --- /dev/null +++ b/challenge-238/bruno-ramos/README @@ -0,0 +1 @@ +Solutions by Bruno Ramos. diff --git a/challenge-238/brxfork/README b/challenge-238/brxfork/README new file mode 100644 index 0000000000..5eb20c6be7 --- /dev/null +++ b/challenge-238/brxfork/README @@ -0,0 +1 @@ +Solution by Philippe Bricout. diff --git a/challenge-238/burkhard-nickels/README b/challenge-238/burkhard-nickels/README new file mode 100644 index 0000000000..f5e16bb98b --- /dev/null +++ b/challenge-238/burkhard-nickels/README @@ -0,0 +1 @@ +Solutions by Burkhard Nickels. diff --git a/challenge-238/bwva/README b/challenge-238/bwva/README new file mode 100644 index 0000000000..ee6a7d7dc1 --- /dev/null +++ b/challenge-238/bwva/README @@ -0,0 +1 @@ +Solution(s) by bwva (Bruce Van Allen) diff --git a/challenge-238/carlos-oliveira/README b/challenge-238/carlos-oliveira/README new file mode 100644 index 0000000000..f8182f8301 --- /dev/null +++ b/challenge-238/carlos-oliveira/README @@ -0,0 +1 @@ +Solution by Carlos Eduardo de Oliveira. diff --git a/challenge-238/cheok-yin-fung/README b/challenge-238/cheok-yin-fung/README new file mode 100644 index 0000000000..05c1883e53 --- /dev/null +++ b/challenge-238/cheok-yin-fung/README @@ -0,0 +1 @@ + Solutions by Cheok-Yin Fung. diff --git a/challenge-238/chicagoist/README.md b/challenge-238/chicagoist/README.md new file mode 100644 index 0000000000..a94f5853a8 --- /dev/null +++ b/challenge-238/chicagoist/README.md @@ -0,0 +1 @@ +Solution by Chicagoist diff --git a/challenge-238/christian-jaeger/README b/challenge-238/christian-jaeger/README new file mode 100644 index 0000000000..4ef4f11c10 --- /dev/null +++ b/challenge-238/christian-jaeger/README @@ -0,0 +1 @@ +Solution by Christian Jaeger diff --git a/challenge-238/clifton-wood/README b/challenge-238/clifton-wood/README new file mode 100644 index 0000000000..c85ee0de50 --- /dev/null +++ b/challenge-238/clifton-wood/README @@ -0,0 +1 @@ +Solutions by Clifton Wood. diff --git a/challenge-238/cliveholloway/README b/challenge-238/cliveholloway/README new file mode 100644 index 0000000000..b69201296e --- /dev/null +++ b/challenge-238/cliveholloway/README @@ -0,0 +1 @@ +Solution by Clive Holloway diff --git a/challenge-238/colin-crain/README b/challenge-238/colin-crain/README new file mode 100644 index 0000000000..2a5d87e97d --- /dev/null +++ b/challenge-238/colin-crain/README @@ -0,0 +1 @@ +Solutions by Colin Crain. diff --git a/challenge-238/conor-hoekstra/README b/challenge-238/conor-hoekstra/README new file mode 100644 index 0000000000..d04e921681 --- /dev/null +++ b/challenge-238/conor-hoekstra/README @@ -0,0 +1 @@ +Solutions by Conor Hoekstra. diff --git a/challenge-238/craig/README b/challenge-238/craig/README new file mode 100644 index 0000000000..18088481eb --- /dev/null +++ b/challenge-238/craig/README @@ -0,0 +1 @@ +Solutions by Craig. diff --git a/challenge-238/creewick/README b/challenge-238/creewick/README new file mode 100644 index 0000000000..c490e4fb80 --- /dev/null +++ b/challenge-238/creewick/README @@ -0,0 +1 @@ +Solutions by Creewick. diff --git a/challenge-238/cristian-heredia/README b/challenge-238/cristian-heredia/README new file mode 100644 index 0000000000..c53da8a54c --- /dev/null +++ b/challenge-238/cristian-heredia/README @@ -0,0 +1 @@ +Solutions by Cristina Heredia. diff --git a/challenge-238/cybersnyder/README b/challenge-238/cybersnyder/README new file mode 100644 index 0000000000..b5afea93b0 --- /dev/null +++ b/challenge-238/cybersnyder/README @@ -0,0 +1 @@ +Solution by Rich Snyder aka cybersnyder diff --git a/challenge-238/dan-friedman/README b/challenge-238/dan-friedman/README new file mode 100644 index 0000000000..2bba8d4938 --- /dev/null +++ b/challenge-238/dan-friedman/README @@ -0,0 +1 @@ +Solutions by Dan Friedman. diff --git a/challenge-238/daniel-aberger/README b/challenge-238/daniel-aberger/README new file mode 100644 index 0000000000..67c2817654 --- /dev/null +++ b/challenge-238/daniel-aberger/README @@ -0,0 +1,2 @@ +Solutions by Daniel Aberger. + diff --git a/challenge-238/daniel-mantovani/README b/challenge-238/daniel-mantovani/README new file mode 100644 index 0000000000..ed538216f2 --- /dev/null +++ b/challenge-238/daniel-mantovani/README @@ -0,0 +1 @@ +Solution by Daniel Mantovani diff --git a/challenge-238/daniel-mita/README b/challenge-238/daniel-mita/README new file mode 100644 index 0000000000..37339f491f --- /dev/null +++ b/challenge-238/daniel-mita/README @@ -0,0 +1 @@ +Solution by Daniel Mita diff --git a/challenge-238/daniel-pfeiffer/README b/challenge-238/daniel-pfeiffer/README new file mode 100644 index 0000000000..15db6b9242 --- /dev/null +++ b/challenge-238/daniel-pfeiffer/README @@ -0,0 +1 @@ +Solutions by Daniel Pfeiffer. diff --git a/challenge-238/dario-mazzeo/README b/challenge-238/dario-mazzeo/README new file mode 100644 index 0000000000..9ed3e21a7f --- /dev/null +++ b/challenge-238/dario-mazzeo/README @@ -0,0 +1 @@ +Solutions by Dario Mazzeo. diff --git a/challenge-238/darren-bottin/README b/challenge-238/darren-bottin/README new file mode 100644 index 0000000000..6c792afe8e --- /dev/null +++ b/challenge-238/darren-bottin/README @@ -0,0 +1 @@ +Solutions by Darren Bottin. diff --git a/challenge-238/dave-cross/README b/challenge-238/dave-cross/README new file mode 100644 index 0000000000..04b1b0623b --- /dev/null +++ b/challenge-238/dave-cross/README @@ -0,0 +1 @@ +Solution by Dave Cross diff --git a/challenge-238/dave-jacoby/README b/challenge-238/dave-jacoby/README new file mode 100644 index 0000000000..7c06689f16 --- /dev/null +++ b/challenge-238/dave-jacoby/README @@ -0,0 +1 @@ +Solution by Dave Jacoby diff --git a/challenge-238/david-kayal/README b/challenge-238/david-kayal/README new file mode 100644 index 0000000000..66f8615260 --- /dev/null +++ b/challenge-238/david-kayal/README @@ -0,0 +1 @@ +Solution by David Kayal diff --git a/challenge-238/david-santiago/README b/challenge-238/david-santiago/README new file mode 100644 index 0000000000..07584efe1d --- /dev/null +++ b/challenge-238/david-santiago/README @@ -0,0 +1 @@ +Solutions by David Santiago. diff --git a/challenge-238/ddobbelaere/README b/challenge-238/ddobbelaere/README new file mode 100644 index 0000000000..36f8cdcd67 --- /dev/null +++ b/challenge-238/ddobbelaere/README @@ -0,0 +1 @@ +Solution by Dieter Dobbelaere diff --git a/challenge-238/deadmarshal/README b/challenge-238/deadmarshal/README new file mode 100644 index 0000000000..243097dede --- /dev/null +++ b/challenge-238/deadmarshal/README @@ -0,0 +1 @@ +Solution by Ali Moradi \ No newline at end of file diff --git a/challenge-238/demerphq/README b/challenge-238/demerphq/README new file mode 100644 index 0000000000..99efaa8cc6 --- /dev/null +++ b/challenge-238/demerphq/README @@ -0,0 +1 @@ +Solution by Yves Orton. diff --git a/challenge-238/demerphq/README.md b/challenge-238/demerphq/README.md new file mode 100644 index 0000000000..66d2bdc1ca --- /dev/null +++ b/challenge-238/demerphq/README.md @@ -0,0 +1,139 @@ +# Challenge 237 - Seize The Day and Maximise Greatness + +## Seize The Day - Simple Rules The Day + +My solution was based on using Time::Local to compute the epoch for noon +on the first day of the month, and then stepping forward by day until +the required day of week has been found, and then stepping forward by +week until the required repetition of that day has been found, or we ran +off the end of the calender month. Using noon instead of midnight is IMO +a prudent guard against issues related leap seconds, but probably isn't +really necessary but doesn't hurt either. + +## Maximise Greatness - Permutation Misdirection + +Task #2 is more difficult and IMO more interesting. The problem is +stated as the following: "Maximise Greatness: You are given an array of +integers. Write a script to permute the give[n] array such that you get +the maximum possible greatness. To determine greatness, [count pairs +that satisfy] nums[i] < perm[i] where 0 <= i < nums.length", and then +gives the example of + + Input: @nums = (1, 3, 5, 2, 1, 3, 1) + Output: 4 + + One possible permutation: (2, 5, 1, 3, 3, 1, 1) + which returns 4 greatness as below: + nums[0] < perm[0] + nums[1] < perm[1] + nums[3] < perm[3] + nums[4] < perm[4] + +I think this is a fun little problem and a good example of the kind of +problem that gets posed in the perl-weekly challenge. Simple input, +simple output, simple description, but a deeper problem than it might +seem at first blush. + +The reason I say deeper is that way the problem is stated it makes it +seem like we need to compute a permutation, and that the solution to the +problem might be `O(N!)` or `O(N**2)`. But on closer inspection we can +see that we need not compute a permutation at all, and we only need to +do so if we want to visually debug that our answer is correct. It +actually turns out that all we need to do is find the count of the most +frequently occuring number in the array. The maximum greatness will be +the number of elements in the array minus the count of the most +frequently occuring element in the array. + +A complete proof of this is a bit beyond this document. But we can get +the general idea by considering a sorted array. Lets say we have an +array with duplicates, such that `A[0] < A[1] < A[2] ... < A[n-1]`. It +is obvious that the maximum element in the array is the only one that +cannot be paired with something larger than it. We can view this as a +rotation of the array: + +``` + | 1, 2, 3 | + | 2, 3, 1 | <- rotate left by 1. + | X X | <- Which columns satisfy the constraint +``` + +In this case it is obvious that the maximum greatness is 1 less than +number of elements in the array, and 1 is the count of the most +frequently occuring element. If we then duplicate one of the elements +and we rotate the array by different numbers of elements we can see +maximum is the same regardless of which element is duplicated, and that +the rotating any more than the number of duplicates causes the number of +pairs that satisify the constraint to reduce. + +``` + | 1, 1, 2, 3 | 1, 2, 2, 3 | 1, 2, 3, 3 | + | 1, 2, 3, 1 | 2, 2, 3, 1 | 2, 3, 3, 1 | <- rotate 1 + | X X | X X | X X | + + | 1, 1, 2, 3 | 1, 2, 2, 3 | 1, 2, 3, 3 | + | 2, 3, 1, 1 | 2, 3, 1, 2 | 3, 3, 1, 2 | <- rotate 2 + | X X | X X | X X | + + | 1, 1, 2, 3 | 1, 2, 2, 3 | 1, 2, 3, 3 | + | 3, 1, 1, 2 | 3, 1, 2, 2 | 3, 1, 2, 3 | <- rotate 3 + | X | X | X | +``` + +The same pattern holds if the array contains two sets of duplicated +numbers, the maximum number of pairs is found when the rotation matches +the count of the most frequently repeated element: + +``` + | 1, 1, 2, 2, 3 | 1, 2, 2, 3, 3 | 1, 1, 2, 3, 3 | + | 1, 2, 2, 3, 1 | 2, 2, 3, 3, 1 | 1, 2, 3, 3, 1 | <- rotate left by 1 + X X | X X | X X | + + | 1, 1, 2, 2, 3 | 1, 2, 2, 3, 3 | 1, 1, 2, 3, 3 | + | 2, 2, 3, 1, 1 | 2, 3, 3, 1, 2 | 2, 3, 3, 1, 1 | <- rotate left by 2 + | X X X | X X X | X X X | + + | 1, 1, 2, 2, 3 | 1, 2, 2, 3, 3 | 1, 1, 2, 3, 3 | + | 2, 3, 1, 1, 2 | 3, 3, 1, 2, 2 | 3, 3, 1, 1, 2 | <- rotate left by 3 + | X X | X X | X X | +``` + +And lastly consider what happens when we have 1 unique element, 1 pair, +and 1 triplicate: + +``` + | 1, 2, 2, 3, 3, 3 | 1, 1, 2, 2, 2, 3 | 1, 1, 1, 2, 3, 3 | + | 2, 2, 3, 3, 3, 1 | 1, 2, 2, 2, 3, 1 | 1, 1, 2, 3, 3, 1 | <- rotate 1 + | X X | X X | X X | + + | 1, 2, 2, 3, 3, 3 | 1, 1, 2, 2, 2, 3 | 1, 1, 1, 2, 3, 3 | + | 2, 3, 3, 3, 1, 2 | 2, 2, 2, 3, 1, 1 | 1, 2, 3, 3, 1, 1 | <- rotate 2 + | X X X | X X X | X X X | + + | 1, 2, 2, 3, 3, 3 | 1, 1, 2, 2, 2, 3 | 1, 1, 1, 2, 3, 3 | + | 3, 3, 3, 1, 2, 2 | 2, 2, 3, 1, 1, 2 | 2, 3, 3, 1, 1, 1 | <- rotate 3 + | X X X | X X X | X X X | + + | 1, 2, 2, 3, 3, 3 | 1, 1, 2, 2, 2, 3 | 1, 1, 1, 2, 3, 3 | + | 3, 3, 1, 2, 2, 3 | 2, 3, 1, 1, 2, 2 | 3, 3, 1, 1, 1, 2 | <- rotate 4 + | X X | X X | X X | +``` + +In each case we can see that the maximum greatness is determined only +by the number of elements in the array and the count of the most +frequent element. Note, that there may actually be two rotations of a +sorted array that produce the maximum greatness, that of the count of +the most frequent element, and that of the count of the second most +frequent element. If the counts differ then there will be two possible +rotations that give the maximum greatness. + +The last point to observe is that if we **must** produce a permutation +that would produce the maximum greatness then we can produce an array +`S` of the indexes of the input array such that `A[S[i]] <= A[S[i+1]]`. +We can then solve for the sorted array by rotating it left by the count +of the most frequent element, and then use `S` to map the solution into +the appropriate order for the actual input array. + +Thus if we are to compute t