Untitled

#include <stdio.h>
int main(){
int a[3][3] ={{1, 2, 3},
             {4, 5, 6},
             {7, 8, 9}};
  int trace = 0;
  for(int i = 0; i < 3; i++){
     for(int j = i+1; j < n; j++){
        if(i == j)
        trace += i;
}
}
        printf("%d",trace);
    return 0;
}