Magija

#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define F first
#define S second
using pi=pair<int,int>;
using ii=long long;
int main()
{
    int n, m;
    cin >> n >> m;
    vector<string>v(n);
    for (int i = 0; i < n; ++i) {
        cin >> v[i];
    }
    vector<string>res(n*2);
    for (int i = 0; i < n; ++i) {
        res[i] = v[i];
    }
    for (int i = 0; i < n; ++i) {
        res[n * 2 - i - 1] = v[i];
    }
    for (int i = 0; i < n * 2; ++i) {
        string b = res[i];
        reverse(all(b));
        res[i] += b;
    }
    int x, y;
    cin >> y>> x;
    y--;
    --x;
    res[y][x]=res[y][x]=='#'?'.':'#';
    for (int i = 0; i < n * 2; ++i) {
        cout << res[i] << "\n";
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED