Waiting for the dawn

cin >> n >> m; 
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++){
            cin >> str[i][j];
            if (str[i][j] == '*') {
                if (i <= x1) x1 = i; 
                if (j <= x2) x2 = j;
                if (i >= y1) y1 = i;
                if (j >= y2) y2 = j;
            }
        }
    for(int i = x1; i <= y1; i++){
        for (int j = x2; j <= y2; j++)
            cout << str[i][j];
        cout << endl;
    }
    return 0;

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