2 задача (исправлена)

#include <fstream>
#include <iostream>
using namespace std;
int main()
{
    setlocale(LC_ALL, "RUS");
    int i, j, N, M, k;
    int a[20][20];
    double one1, one2, OneI, OneJ, avg, sum, sum1;
    ifstream infile;
    infile.open("input.txt");
        infile >> N;
        infile >> M;
        infile >> k;

        for (i = 0; i<N; i++)
            for (j = 0; j<M; j++)
                infile >> a[i][j];
        infile.close();
    one1=0;
    one2=0;
        for (j = 0; j < M; j++)
    {
                if(a[0][j]==1)
                {
                    one1=one1+1;
                }
    }
       for (i=0; i<N; i++)
         {
                if(a[i][i]==1)
                {
                    one2=one2+1;
                }
         }
   OneI=0;
   OneJ=0;
        if (one1==one2)
        {
          for(i=N; i>=0;i--)
              for(j=M; j>=0; j--)
              {
                  if(a[i][j]==1)
                  {
                      OneI=i;
                      OneJ=j;
                  }
              }
          cout<<"First 1 IJ "<<OneI+1<<" "<<OneJ+1<<"\n";
        }
        else
        {
            for(i=0; i<N;i++)
                for(j=0; j<M; j++)
                {
                    sum=sum+a[i][j];
                }
            cout<<"Sum "<<sum<<"\n";
            avg=sum/(N*M);
            cout<<"Average of matrix: "<<avg<<"\n";
        }
    system("pause");
    return 0;
}