제출 #569079

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
569079		Waratpp123	철인 이종 경기 (APIO18_duathlon)	C++14	0 / 100	1116 ms	1048576 KiB

count_triplets

#include<bits/stdc++.h>
using namespace std;
vector<long long> g[100010];
long long ans=0,sz[100010],n,gr[100010],cnt=0;
void findsz(long long i,long long p){
    gr[i]=cnt;
    for(auto x: g[i]){
        if(x==p) continue;
        findsz(x,i);
    }
    sz[i]++;
    for(auto x: g[i]){
        if(x==p) continue;
        sz[i]+=sz[x];
    }
}
void findans(long long i,long long p,long long r){
    long long sum=sz[r]-sz[i];
    ans-=((sz[r]-sz[i])*(sz[r]-sz[i]));
    for(auto x : g[i]){
        if(x==p) continue;
        sum+=sz[x];
        ans-=(sz[x]*sz[x]);
    }
    ans+=(sum*sum);
    for(auto x : g[i]){
        if(x==p) continue;
        findans(x,i,r);
    }
}
int main(){
    long long m,u,v,i;
    scanf("%lld %lld",&n,&m);
    for(i=1;i<=m;i++){
        scanf("%lld %lld",&u,&v);
        g[u].push_back(v);
        g[v].push_back(u);
    }
    for(i=1;i<=m;i++){
        if(gr[i]!=0) continue;
        cnt++;
        findsz(i,-1);
        findans(i,-1,i);
    }

    printf("%lld\n",ans);
return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%lld %lld",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
count_triplets.cpp:35:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         scanf("%lld %lld",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~

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