C :

#include<stdio.h>
int main( )
{
    double m[12][12],s;
    int i,j; 
    char z;
    scanf(" %c",&z);
    for(i=0;i<12;i++)
    {
        for(j=0;j<12;j++)
        {
            scanf("%lf",&m[i][j]);
        }
     }
    s=0;
    for(i=0;i<12;i++)
    {
        for(j=i+1;j<12;j++)
        {
            s+=m[i][j];
        }
    }
    if(z=='S')
    {
        printf("%.1lf",s);
    }
    if(z=='M')
    {
        printf("%.1lf",s/66.0);
    }

    return 0;
}

C++ :

#include <iostream>

using namespace std;

int main()
{
    double M[100][100], sum = 0;
    char A;
    cin >> A;
    for(int i = 0; i < 12; i ++)
    {
        for (int j = 0; j < 12; j ++)
        {   
            cin >> M[i][j];
            if(j > i)
                sum = sum + M[i][j];
        }
    }
    if(A =='S') printf("%.1lf",sum);
    else printf("%.1lf",sum/66.0);

    return 0;
}

Java :

import java.util.Scanner;
class Main{
    public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    float[][] M=new float[13][13];
    String a=sc.next();
    double sum=0.0,avaerage=0.0;
    for(int i=0;i<12;++i){
        for (int j=0;j<12;++j){
            M[i][j]=sc.nextFloat();
        }
    }
    
        for(int i=0;i<12;++i){
            for(int j=i+1;j<12;++j){
                sum=M[i][j]+sum;
            }
        }
        
        for(int i=0;i<12;++i){
            for(int j=i+1;j<12;++j){
                avaerage=sum/66;
            }
        }
        
        if(a.equals("S")){System.out.printf("%.1f",sum);}
        if(a.equals("M")){System.out.printf("%.1f",avaerage);}
        
        
    }
}