Submission

Score: 100

User: Shirolnwza

Problemset: หุ่นพัง

Language: cpp

Time: 0.003 second

Submitted On: 2026-03-19 14:01:07

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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin>>n;
    vector<string> grid(n);
    for(int i=0;i<n;i++){
        cin>>grid[i];
    }
    int dr[2]={0,-1};
    int dc[2]={-1,0};
    int cnt=1;
    queue<pair<int,int>> q;
    q.push({n-1,n-1});
    while (!q.empty())
    {
        auto [r,c]=q.front();
        q.pop();
        for(int i=0;i<2;i++){
            int rr=r+dr[i];
            int cc=c+dc[i];
            if(rr<0||rr>=n||cc<0||cc>=n||grid[rr][cc]=='X'){continue;}
            grid[rr][cc]='X';
            cnt++;
            q.push({rr,cc});
        }
    }
    cout<<cnt;

    return 0;
}