diff --git a/Makefile b/Makefile index ebcda30..f30a7f9 100644 --- a/Makefile +++ b/Makefile @@ -17,6 +17,9 @@ day2: day2/p1.c day2/p2.c ${CC} ${CFLAGS} $@/p1.c -o bin/$@p1 ${CC} ${CFLAGS} $@/p2.c -o bin/$@p2 +day3: day3/p1.c day3/p2.c + ${CC} ${CFLAGS} $@/p1.c -o bin/$@p1 +# ${CC} ${CFLAGS} $@/p2.c -o bin/$@p2 clean: rm -f bin/day*p* \ No newline at end of file diff --git a/day3/in.my b/day3/in.my new file mode 100644 index 0000000..14a7579 --- /dev/null +++ b/day3/in.my @@ -0,0 +1,140 @@ +...................305.124................................432..............................................576..313.....514................. +.............113...-......&....................&...819...........654..../..........................&901................*....869.257......... +...377..&783../.................................9...........855*......940..463................-.........................844.*....@......679. 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+....................834.....994.......*........266.....*......*............................................/.....941.434...812.......*..211. +.............133......*......*.....613...85..........871.......497..346...737....88.....176.....192$........128.*.......&......./163.26..... +....734..543....*.....656....461........*......531..................*........../...*..&................$971.....931......................... +................606....................506............................779.......30...211.....243..........................153...504......... diff --git a/day3/in.test b/day3/in.test new file mode 100644 index 0000000..b20187f --- /dev/null +++ b/day3/in.test @@ -0,0 +1,10 @@ +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598.. diff --git a/day3/p1.c b/day3/p1.c new file mode 100644 index 0000000..8823abc --- /dev/null +++ b/day3/p1.c @@ -0,0 +1,79 @@ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include + +int main(int argc, char **argv) { + FILE *input; + char *line = NULL; + size_t line_length = 0; + + if (argc == 1 || argv[1][0] == '-') + input = stdin; + else if ((input = fopen(argv[1], "r")) == NULL) { + printf("Cannot open file %s\n", argv[1]); + return -1; + } + + char **engine = NULL; + ssize_t engine_line_size = 0; + ssize_t engine_lines = 0; + + while (getline(&line, &line_length, input) != -1) { + ssize_t len = strlen(line)-1; + if (engine == NULL) { + engine = (char **) calloc(len, sizeof(char*)); + engine_line_size = len; + } + + engine[engine_lines] = (char*) calloc(len, sizeof(char)); + memcpy(engine[engine_lines], line, len); + ++engine_lines; + + memset(line, 0, line_length); + } + + int32_t part_number = 0; + + int32_t n = 0; + int32_t multiplier = 1; + bool adjacent = false; + + for (ssize_t i = engine_lines-1; i >= 0; --i) { + for (ssize_t j = engine_line_size-1; j >= 0; --j) { + if (isdigit(engine[i][j])) { + n += (engine[i][j]&0xf) * multiplier; + multiplier *= 10; + + if (adjacent == false && ((j+1 <= engine_line_size-1 && !isdigit(engine[i][j+1]) && engine[i][j+1] != '.') || + (j-1 >=0 && !isdigit(engine[i][j-1]) && engine[i][j-1] != '.') || + (i+1 <= engine_lines-1 && !isdigit(engine[i+1][j]) && engine[i+1][j] != '.') || + (i-1 >= 0 && !isdigit(engine[i-1][j]) && engine[i-1][j] != '.') || + ((i+1 <= engine_lines-1 && j+1 <= engine_line_size-1) && !isdigit(engine[i+1][j+1]) && engine[i+1][j+1] != '.') || + ((i+1 <= engine_lines-1 && j-1 >= 0) && !isdigit(engine[i+1][j-1]) && engine[i+1][j-1] != '.') || + ((i-1 >= 0 && j+1 <= engine_line_size-1) && !isdigit(engine[i-1][j+1]) && engine[i-1][j+1] != '.') || + ((i-1 >= 0 && j-1 >= 0) && !isdigit(engine[i-1][j-1]) && engine[i-1][j-1] != '.'))) { + adjacent = true; + } + } + if ((!isdigit(engine[i][j]) || j == 0) && n != 0) { + if (adjacent) + part_number += n; + n = 0; + multiplier = 1; + adjacent = false; + } + } + } + + for (ssize_t i = 0; i < engine_lines; ++i) + free(engine[i]); + free(engine); + + printf("%d\n", part_number); + + return 0; +} \ No newline at end of file