Submission

Score: 100

User: Seng

Problemset: fireball

Language: cpp

Time: 0.003 second

Submitted On: 2026-06-27 11:02:57

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

int main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int n, m, t;cin >> n >> m >> t;
	int cnt = 0;
	int dy[4] = {0, 1, 0, -1}, dx[4] = {1, 0, -1, 0};
	vector<vector<int>> v(n+1, vector<int>(m+1)), vis(n+1, vector<int>(m+1, false));
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= m; j++){
			cin >> v[i][j];
			if(v[i][j] == 1) cnt++;
		}
	}
	queue<pair<int, int>> q;
	while(t--){
		int a, b;cin >> a >> b;
		q.push({a, b});
		while(!q.empty()){
			auto [y, x] = q.front();
			q.pop();
			if(v[y][x] == 1){
				if(vis[y][x] == true) continue;
				vis[y][x] = true;
				cnt--;
				for(int i = 0; i < 4; i++){
					int xx = x+dx[i];
					int yy = y+dy[i];
					if(yy <= n && yy >= 1 && xx <= m && x >= 1 && v[yy][xx] == 1){
						q.push({yy, xx});
					}
				}
			}
		}
		
		cout << cnt << '\n';
	}
}