APIO 2014 - Beads and Wires
Author: Andi Qu
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Implementation
#include <bits/stdc++.h>typedef long long ll;using namespace std;int n, a, b;ll w, pw[200001], dp[200001][2][2];vector<pair<int, ll>> graph[200001];void dfs(int node, int par) {if (graph[node].size() == 1 && par != -1) return;
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