256. 지뢰 주변 칸 세기와 경계 검사

1#include <stdio.h>
2 
3int main() {
4    int mine[3][3] = {{1, 0, 0}, {0, 0, 1}, {0, 0, 0}};
5    int cnt[3][3] = {0};
6    int r, c, dr, dc;
7    for (r = 0; r < 3; r++) {
8        for (c = 0; c < 3; c++) {
9            if (mine[r][c] == 0) continue;
10            for (dr = -1; dr <= 1; dr++) {
11                for (dc = -1; dc <= 1; dc++) {
12                    int nr = r + dr, nc = c + dc;
13                    if (nr >= 0 && nr < 3 && nc >= 0 && nc < 3)
14                        cnt[nr][nc]++;
15                }
16            }
17        }
18    }
19    for (r = 0; r < 3; r++) {
20        for (c = 0; c < 3; c++)
21            printf("%d", cnt[r][c]);
22        printf("\n");
23    }
24    return 0;
25}