제출 #734680

#제출 시각아이디문제언어결과실행 시간메모리
734680Abrar_Al_Samit구슬과 끈 (APIO14_beads)C++17
28 / 100
1078 ms6740 KiB
#include<bits/stdc++.h> using namespace std; const int nax = 200005; vector<pair<int,int>>g[nax]; int dp[nax][2], n; int solve(int v, int topar, int p = -1) { int &ret = dp[v][(topar>0)]; if(ret!=-1) return ret; ret = 0; int base = 0; for(auto [u, w] : g[v]) if(u!=p) { base += solve(u, w, v); } ret = base; if(topar) { for(auto [u, w] : g[v]) if(u!=p) { int cur = base - solve(u, w, v) + solve(u, 0, v) + topar + w; ret = max(ret, cur); } } return ret; } void PlayGround() { cin>>n; for(int i=1; i<n; ++i) { int u, v, w; cin>>u>>v>>w; g[u].emplace_back(v, w); g[v].emplace_back(u, w); } int ans = 0; for(int i=1; i<=n; ++i) { memset(dp, -1, sizeof dp); ans = max(ans, solve(i, 0)); } cout<<ans<<'\n'; // cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n"; } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); PlayGround(); return 0; }
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