How to iterate over a matrix and compare its elements?

Question

C++ / C#

There is a code

#include <iostream>
using namespace std;
int comparare (int x , int y, int z) {
    int Max ;
    if(x > y && x > z) Max = x;
    if(y > x && y > z) Max = y;
    if(z > x && z > y) Max = z; 
    cout << "\n  - " << "x =  " << x << " y =  " << y << " z = "<< z << endl;
}
int main()
{
    const unsigned int DIM1 = 5;
const unsigned int DIM2 = 5;
int one, two, three, j  , n = 4;

int ary[DIM1][DIM2] = {
    { 1, 0, 0, 0, 0,},
    { 2, 4, 0, 0, 0},
    { 3, 6, 9, 0, 0},
    { 2, 7, 6, 8, 0 },
    { 2, 7, 6, 8, 0 }
};

for (int test = 0 ; test < (n-1) ; test ++) {

    for (int i = test ; i < (n-1) ; ) { 
       one = ary [i][i];       
    for ( j = i ; j < (i+1) ;j++ ) {
        two = ary [j+1][i];
     
    }
     i++;
    three= ary [i][j];
     comp (one,two,tree);
    }   
}           
}

The size of the matrix can be any, as long as it is a square matrix. Elements can also be different because they are entered from the keyboard or random
Next comes such an algorithm
and so it is necessary to compare by 3 all elements of the matrix below the main dianonal.
Why is my code not working?