diff --git a/day2/c/Makefile b/day2/c/Makefile new file mode 100644 index 0000000..5807038 --- /dev/null +++ b/day2/c/Makefile @@ -0,0 +1,9 @@ +CC=gcc +CFLAGS=-std=gnu99 -O2 -g +PROJECT=aoc_day2 + +%.o: %.c + $(CC) -c -o $@ $< $(CFLAGS) + +$(PROJECT): aoc_day2.o + $(CC) -o aoc_day2 aoc_day2.o diff --git a/day2/c/aoc_day2 b/day2/c/aoc_day2 new file mode 100755 index 0000000..d1a3f88 Binary files /dev/null and b/day2/c/aoc_day2 differ diff --git a/day2/c/aoc_day2.c b/day2/c/aoc_day2.c new file mode 100644 index 0000000..8fba3d9 --- /dev/null +++ b/day2/c/aoc_day2.c @@ -0,0 +1,113 @@ +#include +#include +#include + +#define INPUT_FILE ("../input.txt") +#define ARR_LEN (1000) + +typedef enum direction +{ + DIR_FORWARD = 0, + DIR_UP = 1, + DIR_DOWN = 2 +}direction; + +// this is just direction + amount +typedef struct action_t +{ + direction dir; + int amount; +}action_t; + +int main(int argc, char** argv) +{ + int horizontal_pos = 0; + int depth = 0; + int aim = 0; + + FILE* fp = fopen(INPUT_FILE, "r"); + if(fp == NULL) + { + printf("Failed to open file for reading...\n"); + exit(-1); + } + + size_t len = 0; + ssize_t rc = 0; + char* line = NULL; + char action[12]; + + action_t action_bank[ARR_LEN]; + memset(action_bank, 0, sizeof(action_t) * ARR_LEN); + int ct = 0; + while((rc = getline(&line, &len, fp)) > 0) + { + memset(action, '\0', 12); + int amount = 0; + sscanf(line, "%s %d", action, &amount); + action_bank[ct].amount = amount; + if(strcmp(action, "forward") == 0) + { + action_bank[ct].dir = DIR_FORWARD; + horizontal_pos += amount; + } + else if(strcmp(action, "up") == 0) + { + action_bank[ct].dir = DIR_UP; + depth -= amount; + } + else if(strcmp(action, "down") == 0) + { + action_bank[ct].dir = DIR_DOWN; + depth += amount; + } + else + { + printf("action didn't match any known actions -- action: %s\n", action); + exit(-1); + } + ct++; + } + printf("Part 1\n"); + printf("Horizontal Position: %d\n", horizontal_pos); + printf("Depth: %d\n", depth); + printf("calculated course: %d\n", depth * horizontal_pos); + + // part 2 + horizontal_pos = 0; + depth = 0; + for(int ind = 0; ind < ARR_LEN; ind++) + { + /* printf(">>>ACTION: %s\tAMOUNT: %d\n", */ + /* action_bank[ind].dir == DIR_FORWARD ? "FORWARD" : */ + /* action_bank[ind].dir == DIR_UP ? "UP" : */ + /* action_bank[ind].dir == DIR_DOWN ? "DOWN" : "UNKNOWN", */ + /* action_bank[ind].amount); */ + if(action_bank[ind].dir == DIR_FORWARD) + { + horizontal_pos += action_bank[ind].amount; + depth += (aim * action_bank[ind].amount); + } + else if(action_bank[ind].dir == DIR_UP) + { + aim -= action_bank[ind].amount; + } + else if(action_bank[ind].dir == DIR_DOWN) + { + aim += action_bank[ind].amount; + } + else + { + printf("Error, dir unknown\n"); + exit(-1); + } + + } + printf("Part 2\n"); + printf("Horizontal Position: %d\n" + "Depth: %d\n" + "Aim: %d\n", horizontal_pos, depth, aim); + + printf("Final Position: %d\n", horizontal_pos * depth); + return 0; +} diff --git a/day2/c/aoc_day2.o b/day2/c/aoc_day2.o new file mode 100644 index 0000000..4e59d31 Binary files /dev/null and b/day2/c/aoc_day2.o differ diff --git a/day2/input.txt b/day2/input.txt new file mode 100644 index 0000000..83b7ae1 --- /dev/null +++ b/day2/input.txt @@ -0,0 +1,1000 @@ +forward 5 +down 8 +down 6 +down 7 +down 8 +forward 7 +down 3 +up 6 +forward 6 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