This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define fi first
#define se second
#define ll long long
using namespace std ;
const int N = 5e5 ;
bool flag1 ;
int n, ans = 1 ;
pair<int, int> p[N + 1] ;
signed main()
{
    ios_base::sync_with_stdio( 0 ) ;
    cin.tie( 0 ) ;
    cout.tie( 0 ) ;
    cin >> n ;
    for(int i = 1 ; i <= n ; i++)
    {
        cin >> p[i].fi >> p[i].se ;
        if(p[i].se != p[1].se)flag1 = 1 ;
    }
    sort(p + 1, p + n + 1) ;
    if(!flag1)
    {
        for(int i = 1 ; i < n ; i++)
            ans += (p[i].fi != p[i + 1].fi) ;
        cout << ans ;
        return 0 ;
    }
    return 0 ;
}
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