Day9_z11_2D Arrays.cpp

#include <bits/stdc++.h>

using namespace std;

int main()
{
    vector<vector<int>> arr(6);
    for (int i = 0; i < 6; i++) {
        arr[i].resize(6);

        for (int j = 0; j < 6; j++) {
            cin >> arr[i][j];
        }

        cin.ignore(numeric_limits<streamsize>::max(), '\n');
    }

    int max = 0;
    int sum = 0;
    int i,j;
    for (i = 0; i < 4; i++){
        for (j = 0; j < 4; j++){
            sum = (arr[i][j] + arr[i][j+1] + arr[i][j+2] + arr[i+1][j+1] + 
                   arr[i+2][j] + arr[i+2][j+1] + arr[i+2][j+2]);
            if ((sum > max) || (i == 0 && j == 0)){                        //first saving initial sum value, then checking (sum > max)
                max = sum;
            }       
        }
    }

    cout<<max<<endl;

    return 0;
}