mat_simetrica

#include <iostream>
using namespace std;

int main() {
int a[100][100],n,i,j,ok=1;
float m1=0.0,m2=0.0;
cout<<"n=";cin>>n;
for (i=0;i<n;i++)
for (j=0;j<n;j++)
    cin>>a[i][j];

for (i=0;i<n;i++)
    for (j=0;j<n;j++)
    if (a[i][j]!=a[j][i]&&i!=j)
    ok=0;
  if (ok)
  cout<<"DA";
  else
    cout<<"NU";
  return 0;
}