제출 #1133674

#제출 시각아이디문제언어결과실행 시간메모리
1133674MunkhturErdenebat별들과 삼각형 (IZhO11_triangle)C++20
100 / 100
405 ms9228 KiB
#include<bits/stdc++.h> #include<string.h> #include <algorithm> #include <stdlib.h> #define fr first #define sc second #define ll long long using namespace std; ll a,b,c,d,e,f,m,i,j,n,h,g,l,r,ka,p,q,k[500005],t[500005]; map<ll,ll> maa,mii,mee; vector<ll> vis,vo,vi; int main(){ cin>>a; for(i=0 ; i<a ; i++){ cin>>k[i]>>t[i]; maa[k[i]]++; mee[t[i]]++; } h=0; for(i=0 ; i<a ; i++){ h+=(maa[k[i]]-1)*(mee[t[i]]-1); } cout<<h<<endl; }
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