可怜！一个鸭蛋求帮！

#include <bits/stdc++.h>
using namespace std;

int n, m, q, a[103][103], x, y, ans, xx, yy;
bool f, mp[103][103];

int main() {
//	freopen(".in", "r", stdin);
//	freopen(".out", "w", stdout);
	cin >> n >> m >> q;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) cin >> a[i][j];
	}
	while (q--) {
		f = true, ans = 0;
		for (int i = 0; i <= 103; i++) {
			for (int j = 0; j <= 103; j++) mp[i][j] = false;
		}
		cin >> x >> y;
		mp[x][y] = true;
		xx = x, yy = y;
		while (true) {
			if (a[xx][yy] == 1) xx--;
			else if (a[xx][yy] == 2) xx++;
			else if (a[xx][yy] == 3) yy--;
			else if (a[xx][yy] == 4) yy++;
            if (xx == 0 || xx == n + 1 || yy == 0 || yy == m + 1) break;
			if (mp[xx][yy]) {
				f = false;
				break;
			}
			mp[xx][yy] = true;
			ans++;
		}
		if (f) cout << ans << endl;
		else cout << "-1" << endl;
	}
	
	return 0;
}