제출 #335616

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
335616		StanCatalin	별들과 삼각형 (IZhO11_triangle)	C++14	100 / 100	537 ms	14956 KiB

triangle

#include <iostream>
#include <algorithm>
#include <fstream>
#include <map>
#include <vector>

using namespace std;

ifstream in("triangles.in");
ofstream out("triangles.out");

const int dim = 3e5 + 5;

int n,lin[dim],col[dim];
pair<int,int> a[dim];
vector<int> linie;
vector<int> coloana;
int cnt_linie,cnt_coloana;
map<int,int> li;
map<int,int> co;

void Normalizare()
{
    sort(linie.begin(), linie.end());
    for (auto y:linie)
    {
        if (li[y] == 0)
        {
            li[y] = cnt_linie++;
        }
    }

    sort(coloana.begin(), coloana.end());
    for (auto y:coloana)
    {
        if (co[y] == 0)
        {
            co[y] = cnt_coloana++;
        }
    }
}

int main()
{
    cin >> n;
    for (int i=1; i<=n; i++)
    {
        cin >> a[i].first >> a[i].second;
        linie.push_back(a[i].first);
        coloana.push_back(a[i].second);
    }

    Normalizare();

    for (int i=1; i<=n; i++)
    {
        a[i].first = li[a[i].first];
        a[i].second = co[a[i].second];
    }

    for (int i=1; i<=n; i++)
    {
        lin[a[i].first]++;
        col[a[i].second]++;
    }

    int ans = 0;
    for (int i=1; i<=n; i++)
    {
        ans += (lin[a[i].first] - 1) * (col[a[i].second] - 1);
    }
    cout << ans;
    return 0;
}

• Subtask 1: 100 / 100