diff options
author | Thomas Voss <thomasvoss@live.com> | 2021-12-02 14:34:48 +0100 |
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committer | Thomas Voss <thomasvoss@live.com> | 2021-12-02 14:34:48 +0100 |
commit | feca43e796fbe8bde441f017f4c94642392bc40f (patch) | |
tree | 3642a3ceec6375a8275c29de8db22e9f5c88fa44 /2015/23 | |
parent | 3ac99f409ae6545e2f4fece4d9397d28d35b279b (diff) |
Add day 23 solutions
Diffstat (limited to '2015/23')
-rw-r--r-- | 2015/23/Makefile | 9 | ||||
-rw-r--r-- | 2015/23/input | 48 | ||||
-rw-r--r-- | 2015/23/puzzles.l | 103 |
3 files changed, 160 insertions, 0 deletions
diff --git a/2015/23/Makefile b/2015/23/Makefile new file mode 100644 index 0000000..8779ec0 --- /dev/null +++ b/2015/23/Makefile @@ -0,0 +1,9 @@ +all: + flex -f -DYY_NO_INPUT --nounput puzzles.l + ${CC} ${CFLAGS} -lfl -DPROGLEN=`wc -l <input` -o puzzle-1 lex.yy.c + ${CC} ${CFLAGS} -lfl -DPROGLEN=`wc -l <input` -DPART2 -o puzzle-2 lex.yy.c + rm lex.yy.c + +.PHONY: clean +clean: + rm -f puzzle-[12] diff --git a/2015/23/input b/2015/23/input new file mode 100644 index 0000000..cad5dc2 --- /dev/null +++ b/2015/23/input @@ -0,0 +1,48 @@ +jio a, +22 +inc a +tpl a +tpl a +tpl a +inc a +tpl a +inc a +tpl a +inc a +inc a +tpl a +inc a +inc a +tpl a +inc a +inc a +tpl a +inc a +inc a +tpl a +jmp +19 +tpl a +tpl a +tpl a +tpl a +inc a +inc a +tpl a +inc a +tpl a +inc a +inc a +tpl a +inc a +inc a +tpl a +inc a +tpl a +tpl a +jio a, +8 +inc b +jie a, +4 +tpl a +inc a +jmp +2 +hlf a +jmp -7 diff --git a/2015/23/puzzles.l b/2015/23/puzzles.l new file mode 100644 index 0000000..7d654e1 --- /dev/null +++ b/2015/23/puzzles.l @@ -0,0 +1,103 @@ +%{ +#define _POSIX_C_SOURCE +#include <err.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> + +/* Shut up the compiler */ +int fileno(FILE *); + +struct Instr { + enum { + HLF, + INC, + JIE, + JIO, + JMP, + TPL + } type; + enum { + A, + B + } reg; + int imm; +}; + +int i = 0; +struct Instr *program; + +#ifdef PART2 +unsigned long long registers[2] = {1, 0}; +#else +unsigned long long registers[2]; +#endif +%} + +%x ARGS + +%% + +hlf { program[i].type = HLF; BEGIN(ARGS); } +inc { program[i].type = INC; BEGIN(ARGS); } +jie { program[i].type = JIE; BEGIN(ARGS); } +jio { program[i].type = JIO; BEGIN(ARGS); } +jmp { program[i].type = JMP; BEGIN(ARGS); } +tpl { program[i].type = TPL; BEGIN(ARGS); } + +<ARGS>[ab] { program[i].reg = *yytext - 'a'; } +<ARGS>[+\-][0-9]+ { program[i].imm = atoi(yytext); } +<ARGS>[ ,]+ { ; } +<ARGS>\n { i++; BEGIN(INITIAL); } + +%% + +static unsigned long long +execute(void) +{ + for (i = 0; i < PROGLEN; i++) { + switch (program[i].type) { + case HLF: + registers[program[i].reg] /= 2; + break; + case INC: + registers[program[i].reg]++; + break; + case JIE: + if (!(registers[program[i].reg] & 1)) + i += program[i].imm - 1; + break; + case JIO: + if (registers[program[i].reg] == 1) + i += program[i].imm - 1; + break; + case JMP: + i += program[i].imm - 1; + break; + case TPL: + registers[program[i].reg] *= 3; + break; + } + } + + return registers[B]; +} + +int +main(void) +{ + FILE *fp; + + if (!(program = calloc(PROGLEN, sizeof(struct Instr)))) + err(EXIT_FAILURE, "calloc"); + + if (!(fp = fopen("input", "r"))) + err(EXIT_FAILURE, "fopen"); + + yyrestart(fp); + yylex(); + fclose(fp); + + printf("%llu\n", execute()); + return EXIT_SUCCESS; +} |