Envío 2347

Código

#include<stdio.h>
#include<string.h>

int main(){
    int n;
    scanf(" %d",&n);
    int col[n];
    int row[n];
    memset(col,0,sizeof(col));
    memset(row,0,sizeof(row));
    int diag1, diag2;
    diag1 = diag2 = 0;
    for(int i = 0; i < n;++i){
        for(int j = 0; j < n;++j){
            int val;
            scanf(" %d",&val);
            if(i == j)
                diag1 += val;
            if(i + j == n-1)
                diag2 += val;
            col[j] += val;
            row[i] += val;
        }
    }
    int unique = 1;
    for(int i = 1; i < n && unique;++i)
        unique = (col[i] == col[i-1] && row[i] == row[i-1] && row[i] == col[i]);
    unique = unique & (diag1 == diag2 && diag1 == row[0]);
    if(unique)
        puts("Yes");
    else
        puts("No");
    return 0;
}