제출 #389172

#제출 시각아이디문제언어결과실행 시간메모리
389172mosiashvililuka구슬과 끈 (APIO14_beads)C++14
100 / 100
448 ms44764 KiB
#include<bits/stdc++.h> using namespace std; const long long N=1000000000000000000LL; long long a,b,c,d,e,i,j,ii,jj,zx,xc,pas,dp[200009],dp2[200009]; pair <long long, long long> msh[200009]; vector <pair <long long, long long> > v[200009]; multiset <long long> s[200009]; multiset <long long>::iterator tt; void dfsst(long long q, long long w){ long long qw=-N; for(vector <pair <long long, long long> >::iterator it=v[q].begin(); it!=v[q].end(); it++){ if((*it).first==w) continue; msh[(*it).first]=make_pair(q,(*it).second); dfsst((*it).first,q); dp[q]+=max(dp[(*it).first],dp2[(*it).first]); if(qw<(*it).second+dp[(*it).first]-max(dp[(*it).first],dp2[(*it).first])) qw=(*it).second+dp[(*it).first]-max(dp[(*it).first],dp2[(*it).first]); s[q].insert((*it).second+dp[(*it).first]-max(dp[(*it).first],dp2[(*it).first])); } if(qw!=-N){ dp2[q]=msh[q].second+dp[q]+qw; }else{ dp2[q]=-N; } } void rt(long long q, long long w){ dp[q]-=max(dp[w],dp2[w]); long long qw=msh[w].second+dp[w]-max(dp[w],dp2[w]); s[q].erase(s[q].lower_bound(qw)); msh[q].first=w;msh[q].second=msh[w].second; if(s[q].size()!=0){ tt=s[q].end(); tt--; dp2[q]=msh[q].second+dp[q]+(*tt); }else{ dp2[q]=-N; } s[w].insert(msh[q].second+dp[q]-max(dp[q],dp2[q])); dp[w]+=max(dp[q],dp2[q]); } void dfs(long long q, long long w){ pas=max(pas,dp[q]); for(vector <pair <long long, long long> >::iterator it=v[q].begin(); it!=v[q].end(); it++){ if((*it).first==w) continue; rt(q,(*it).first); dfs((*it).first,q); rt((*it).first,q); } } int main(){ ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0); cin>>a; for(i=1; i<a; i++){ cin>>c>>d>>e; v[c].push_back(make_pair(d,e)); v[d].push_back(make_pair(c,e)); } dfsst(1,0); dfs(1,0); cout<<pas; return 0; }
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