判断条件改成i + j <= 10 && i > j更简洁

#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    double a[12][12], s = 0;
    char t;
    cin >> t;
    int c = 0;
    for (int i = 0; i < 12; i ++ )
    {
        for(int j = 0; j < 12; j ++)
        {
            cin >> a[i][j];
            if ( i <= 5 && j <= i - 1 || i > 5 && i + j <= 10)//(i+j)<=10&&i>j
            {
                c ++;
                s += a[i][j];
            }
        }
    }
    printf("%.1lf", t == 'S'? s: s / c);
    return 0;
}