Submission #1241846

#TimeUsernameProblemLanguageResultExecution timeMemory
1241846nibert트리 (IOI24_tree)C++20
0 / 100
2097 ms26424 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; const int MAXN = 200005; int N; vector<int> tree[MAXN]; int weight[MAXN]; bool isLeaf[MAXN]; int leafCount[MAXN]; vector<pair<ll, ll>> segments; // {a, b} means a * L + b * R void dfs_mark_leaves_and_count(int u) { isLeaf[u] = true; leafCount[u] = 0; for (int v : tree[u]) { isLeaf[u] = false; dfs_mark_leaves_and_count(v); leafCount[u] += leafCount[v]; } if (isLeaf[u]) leafCount[u] = 1; } // Recursive decomposition void decompose(int u) { int k = leafCount[u]; if (isLeaf[u]) { segments.push_back({1LL * k * weight[u], 0}); // contributes k*L*W[u] return; } // If kL - R > 0, we pay (kL - R) * W[u], which is a = k*W[u], b = -W[u] segments.push_back({1LL * k * weight[u], -1LL * weight[u]}); for (int v : tree[u]) { decompose(v); } } void init(vector<int> P, vector<int> W) { N = P.size(); for (int i = 0; i < N; ++i) { tree[i].clear(); isLeaf[i] = false; } for (int i = 1; i < N; ++i) { tree[P[i]].push_back(i); } for (int i = 0; i < N; ++i) weight[i] = W[i]; dfs_mark_leaves_and_count(0); segments.clear(); decompose(0); } ll query(int L, int R) { ll res = 0; for (auto& seg : segments) { res += seg.first * L + seg.second * R; } return res; }
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