Submission #38957

#	Time	Username	Problem	Language	Result	Execution time	Memory
38957		Scayre	Star triangles (IZhO11_triangle)	C++14	100 / 100	1039 ms	8960 KiB

triangle

//
// omae wa mou shindeiru.
//

#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,sse3,sse4,popcnt,abm,mmx")

#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <cassert>
#include <iomanip>
#include <iostream>
#include <algorithm>

#define ll long long
#define ull unsigned ll
#define ioi exit(0);

#define f first
#define s second

#define inf (int)1e9 + 7

#define NFS ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);

#define mp make_pair

#define lb(x) lower_bound(x)
#define ub(x) upper_bound(x)

#define pb push_back
#define ppb pop_back

#define endl "\n"

#define in(x) insert(x)

#define sz(x) (int)x.size()

#define all(x) x.begin(),x.end()

#define pw2(x) (1<<x) //2^x

#define sqr(x) ((x) * 1ll * (x))

using namespace std;

const int N = (int)5e5 + 7, MOD = (int)1e9 + 7;

int n;

pair <int,int> a[N];

ll ans=0;

map <int,int> x,y;

int main(){ 

	#ifdef IOI2019
		freopen ("in.txt", "r", stdin);
	#endif

	//NFS

	cin >> n;
	
	for(int i=1;i<=n;i++){
		cin >> a[i].f >> a[i].s;
		x[a[i].f]++;
		y[a[i].s]++;
	}

	for(int i=1;i<=n;i++){
		int l=x[a[i].f]-1,r=y[a[i].s]-1;
		ans+=l*r;
	}

	cout << ans << endl;

	#ifdef IOI2019
		cout << "\nTime Elapsed : " << clock () * 1.0 / CLOCKS_PER_SEC << endl;
	#endif

	ioi
}

• Subtask 1: 100 / 100