Symmetric Matrix

ACCEPTED...Among the simplest i have seen.
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Question: Symmetric Matrix
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#include "iostream.h"
#include "math.h"
int main()
{
int t;
cin >>t;
for(int i = 1; i <= t; i++) {
    cin.ignore(4);
    int n, sym = 1;
    cin >> n;
    long long int mat[n][n];
    for(int j = 0; j < k =" 0;">> mat[j][k];
    for(int j = 0; j <= ceil(n/2); j++) for(int k = 0; k < n; k++) if(mat[j][k] < 0 || mat[j][k] != mat[n - j - 1][n - k - 1]) sym = 0;
    cout << "Test #" << i << ": ";
    if(sym) cout << "Symmetric.\n";
    else cout << "Non-symmetric.\n";
}
return 0;
}
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