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solved 6, with graphics lol

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kirreen 2024-12-08 19:02:07 +01:00
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#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<stdbool.h>
#include<unistd.h>
int main ()
{
int guard[2];
int rot = 0;
int dir[4][2] = {{0, -1}, {1, 0}, {0, 1}, {-1, 0}};
// figure out data dimensions
FILE *input = fopen("./input", "r");
int width = 0;
int height = 1;
while (fgetc(input) != '\n') width++;
for (char c = fgetc(input); c != EOF; c = fgetc(input)) {
if (c == '\n')
height++;
}
rewind(input);
printf("Dimensions: %d x %d\n", width, height);
// make 2d array
char **grid = malloc(width * sizeof(char*));
grid[0] = malloc(width * height);
for (int i = 1; i < width; i++) {
grid[i] = grid[0] + i * height;
}
// put the data in the array
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
grid[j][i] = fgetc(input);
if (grid[j][i] == '^') {
guard[0] = j;
guard[1] = i;
printf("guard coords: %d/%d\n", guard[0], guard[1]);
}
}
// skip newline
fgetc(input);
}
fclose(input);
// sum it
int sum_x = 0;
// step (mark current X, check forward, step or rotate) until oob
while (true) {
// graphics!
/*
printf("\e[1;1H\e[2J");
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
printf("%c", grid[j][i]);
}
printf("\n");
}
usleep(2000);
printf("\e[1;1H\e[2J");
*/
if (grid[guard[0]][guard[1]] != 'X') {
sum_x++;
grid[guard[0]][guard[1]] = 'X';
}
// oob?
if (guard[0] + dir[rot][0] < 0 ||
guard[0] + dir[rot][0] >= height ||
guard[1] + dir[rot][1] < 0 ||
guard[1] + dir[rot][1] >= height)
break;
if (grid[guard[0] + dir[rot][0]][guard[1] + dir[rot][1]] == '#')
rot = (rot + 1) % 4;
// step
guard[0] += dir[rot][0];
guard[1] += dir[rot][1];
}
printf("total Xs: %d\n", sum_x);
}