Sum of all elemnts of matrix #1

#1

#include
using namespace std;

int main()
{
int n,m;
cin>>n>>m;
int a[100][100]={0};
for(int i=0;i<n;i++)
{
for(int j=0;j<m;j++)
{
cin>>a[i][j];
}
}

int sum=0;
for(int ti=0;ti<n;ti++)
{
    for(int tj=0;tj<n;tj++)
    {
        for(int bi=ti+1;bi<n;bi++)
        {
            for(int bj=tj+1;bj<n;bj++)
            {
                for(int i=ti;i<=bi;i++)
                {
                    for(int j=tj;j<=bj;tj++)
                    {
                        sum+=a[i][j];
                    }
                }
            }
        }
    }
}

cout<<sum;

}

can you check where is the error
in a 2x2 matrix the loop doesnt end
in a 1x! matrix the sum is 0

#2

hi @anasmir24

this should be j++ instead of tj++