[BOJ] 14504 : 로봇 청소기

#include <stdio.h>
#define r(a,b) a=(a+b)%4

const int dx[] = { -1,0,1,0 };
const int dy[] = { 0,1,0,-1 };
int n, m, x, y, nx, ny, d, ans;

int main() {
	int a[55][55] = { 0 };

	scanf("%d %d %d %d %d", &n, &m, &x, &y, &d);
	for (int i = 0; i < n; i++) for (int j = 0; j < m; j++)
		scanf("%d", &a[i][j]);

	bool flag = 1;
	while (flag) {
		if (!a[x][y]) ans++, a[x][y] = 2;
		for (int i = 0; i < 5; i++) {
			if (i == 4) {
				r(d, 2), nx = x + dx[d], ny = y + dy[d], r(d, 2);
				a[nx][ny] != 1 ? (x = nx, y = ny) : flag = 0;
				break;
			}
			r(d, 3), nx = x + dx[d], ny = y + dy[d];
			if (!a[nx][ny]) {
				x = nx, y = ny;
				break;
			}
		}
	}

	printf("%d", ans);

	return 0;
}