advent-of-code/2018/03/day3.c

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#include <stdio.h>
#define SIZE 1000
struct Claim {
int left;
int top;
int width;
int height;
int id;
};
struct Claim parseClaim(char line[25]) {
struct Claim claim;
sscanf(line, "#%d @ %d,%d: %dx%d", &claim.id, &claim.left, &claim.top, &claim.width, &claim.height);
return claim;
}
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void resetFields(int fabric [SIZE][SIZE]) {
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for (int i=0; i<SIZE; i++) {
for (int j=0; j<SIZE; j++) {
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fabric[i][j] = 0;
}
}
}
void setFields(struct Claim claim, int fabric [SIZE][SIZE]) {
for (int i=claim.left; i<claim.left+claim.width; i++) {
for (int j=claim.top; j<claim.top+claim.height; j++) {
fabric[i][j] += 1;
}
}
}
int countDoubles(int fabric [SIZE][SIZE]) {
int sum = 0;
for (int i=0; i<SIZE; i++) {
for (int j=0; j<SIZE; j++) {
if (fabric[i][j] > 1) {
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sum++;
}
}
}
return sum;
}
int main() {
int fabric [SIZE][SIZE];
FILE* input = fopen("input", "r");
char line [25];
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resetFields(fabric);
while (fgets(line, sizeof(line), input)) {
struct Claim claim = parseClaim(line);
setFields(claim, fabric);
}
printf("%d\n", countDoubles(fabric));
return 0;
}