diff options
Diffstat (limited to '2020/18')
| -rw-r--r-- | 2020/18/.gitignore | 1 | ||||
| -rw-r--r-- | 2020/18/Makefile | 7 | ||||
| -rw-r--r-- | 2020/18/input | 379 | ||||
| -rw-r--r-- | 2020/18/puzzles.c | 126 |
4 files changed, 513 insertions, 0 deletions
diff --git a/2020/18/.gitignore b/2020/18/.gitignore new file mode 100644 index 0000000..60d075d --- /dev/null +++ b/2020/18/.gitignore @@ -0,0 +1 @@ +puzzle-[12] diff --git a/2020/18/Makefile b/2020/18/Makefile new file mode 100644 index 0000000..c32dafa --- /dev/null +++ b/2020/18/Makefile @@ -0,0 +1,7 @@ +all: + ${CC} ${CFLAGS} -o puzzle-1 puzzles.c + ${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c + +.PHONY: clean +clean: + rm -f puzzle-[12] diff --git a/2020/18/input b/2020/18/input new file mode 100644 index 0000000..c39b341 --- /dev/null +++ b/2020/18/input @@ -0,0 +1,379 @@ +6 * 7 * 8 * 9 * ((8 * 3 * 9) * 7 + 2 + 4 * 8 + 2) + 5 +3 * 2 * (5 + (8 + 2 * 2 * 8 + 8) * 8) +5 + 7 * 8 * 2 +(8 + 5 * 9 + (8 * 9 + 7 + 8)) * 4 * 3 * (8 * 9) * 3 +(7 + 2 + 2 + 5 * 6 * 3) * 8 + 5 * 9 +(9 + (2 * 9 + 6 + 5 + 2 + 7) + 4) + 5 + (9 + (7 + 8 * 6 + 3 * 8) * (5 + 3 * 2 * 9) + 7 * (4 * 5 + 6 + 9)) + 9 * 7 * 4 +5 * (8 + 2 + 9 * 6) +(4 * 8 + 8 + 5 * (5 * 3 + 7 * 8 + 8 + 2) + 8) * 4 * 2 * 7 + 3 + 8 +6 + 9 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\ No newline at end of file diff --git a/2020/18/puzzles.c b/2020/18/puzzles.c new file mode 100644 index 0000000..5afbe00 --- /dev/null +++ b/2020/18/puzzles.c @@ -0,0 +1,126 @@ +#define _GNU_SOURCE +#include <sys/types.h> + +#include <ctype.h> +#include <err.h> +#include <stdio.h> +#include <stdlib.h> + +static unsigned long long parse_number(void); +static unsigned long long parse_digit(void); +static unsigned long long parse_result(void); + +#ifdef PART2 +static unsigned long long parse_sum(void); +static unsigned long long parse_product(void); +#endif + +char *g_current; + +/* Convert the current number from a string to an int */ +unsigned long long +parse_number(void) +{ + unsigned long long number = 0; + while (isdigit(*g_current)) + number = number * 10 + *g_current++ - '0'; + + return number; +} + +/* Parse the current digit pointed to by `g_current` */ +unsigned long long +parse_digit(void) +{ + if (isdigit(*g_current)) + return parse_number(); + + /* If not a digit, it's a parenthesis */ + g_current++; + unsigned long long result = parse_result(); + g_current++; + return result; +} + +#ifdef PART2 +/* Parse and compute a sum */ +unsigned long long +parse_sum(void) +{ + unsigned long long result = parse_digit(); + + while (*g_current == '+') { + g_current++; + result += parse_digit(); + } + + return result; +} + +/* Parse and compute a product */ +unsigned long long +parse_product(void) +{ + unsigned long long result = parse_sum(); + + while (*g_current == '*') { + g_current++; + result *= parse_sum(); + } + + return result; +} +#endif + +/* Parse and compute a sum */ +unsigned long long +parse_result(void) +{ +#ifdef PART2 + return parse_product(); +#else + unsigned long long result = parse_digit(); + + while (*g_current == '+' || *g_current == '*') { + if (*g_current++ == '+') + result += parse_digit(); + else + result *= parse_digit(); + } + + return result; +#endif +} + +/* Remove the spaces from user input */ +static void +remove_spaces(char *str) +{ + char const *c = str; + do + while (*c == ' ') + c++; + while ((*str++ = *c++)); +} + +int +main(void) +{ + FILE *fp; + char *line = NULL; + size_t len = 0; + ssize_t read; + + if (!(fp = fopen("input", "r"))) + err(EXIT_FAILURE, "fopen"); + + unsigned long long acc = 0; + while ((read = getline(&line, &len, fp)) != -1) { + remove_spaces(line); + g_current = line; + acc += parse_result(); + } + + printf("%llu\n", acc); + return EXIT_SUCCESS; +} |