37 lines
910 B
C
37 lines
910 B
C
#include <stdio.h>
|
|
|
|
int main(void) {
|
|
FILE *fp = fopen("input.txt", "r");
|
|
unsigned char map[1000][1000] = {0};
|
|
unsigned x0, x1, y0, y1;
|
|
unsigned intersections = 0;
|
|
|
|
while (fscanf(fp, "%u,%u -> %u,%u", &x0, &y0, &x1, &y1) == 4) {
|
|
char inc = 1;
|
|
if (x0 == x1) {
|
|
if (y0 > y1)
|
|
inc = -1;
|
|
for (unsigned y = y0; y != y1; y += inc) {
|
|
map[x0][y]++;
|
|
}
|
|
map[x0][y1]++;
|
|
} else if (y0 == y1) {
|
|
if (x0 > x1)
|
|
inc = -1;
|
|
for (unsigned x = x0; x != x1; x += inc) {
|
|
map[x][y0]++;
|
|
}
|
|
map[x1][y0]++;
|
|
}
|
|
}
|
|
|
|
for (unsigned y = 0; y < 1000; y++) {
|
|
for (unsigned x = 0; x < 1000; x++) {
|
|
if (map[x][y] > 1)
|
|
intersections++;
|
|
}
|
|
}
|
|
|
|
printf("Answer: %d\n", intersections);
|
|
}
|