TRUNGVI C++

#include<bits/stdc++.h>
using namespace std;

int n;
int a[1000][1000];
int b[1000];
int c[1000];
void input()
{
    cin >> n;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++)
        {
            cin >> a[i][j];
        }
}

int main()
{
    freopen("trungvi.inp","r",stdin);
    freopen("trungvi.out","w",stdout);
    input();
    int na = 0;
    for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= n; j++)
        {   
            c[j] = a[i][j];
        }    
        sort(c+1, c+n+1); 
        na++;
        b[na] = c[(n+1)/2];
    }

    sort(b+1,b+n+1);

    cout << b[(na+1)/2];
    return 0;
}