제출 #1151138

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1151138		Zicrus	트리 (IOI24_tree)	C++20	18 / 100	70 ms	28128 KiB

tree

#include <bits/stdc++.h>
#include "tree.h"
using namespace std;

typedef long long ll;

int n;
vector<int> p, w;
vector<vector<ll>> adj;
map<ll, ll> leaves; // leaf count, tree count
ll zeroCnt = 0;

ll dfs(ll cur) {
    if (w[cur] == 0 && p[cur] >= 0 && w[p[cur]] == 1) zeroCnt++;
    ll leafCnt = 0;
    for (auto &e : adj[cur]) {
        leafCnt += dfs(e);
    }
    if (w[cur] == 1 && (p[cur] == -1 || w[p[cur]] == 0)) {
        leaves[max(1ll, w[cur] ? leafCnt : 1)]++;
    }
    return max(1ll, w[cur] ? leafCnt : 1);
}

void init(vector<int> P, vector<int> W) {
    p = P;
    w = W;
    n = (int)p.size();
    adj = vector<vector<ll>>(n);
    zeroCnt = 0;
    for (int i = 1; i < n; i++) {
        adj[p[i]].push_back(i);
    }
    dfs(0);
}

ll query(int L, int R) {
    ll result = -zeroCnt * L;
    for (auto &[leafCnt, c] : leaves) {
        ll leafStuff = leafCnt * L;
        if (leafStuff > R) {
            result += c * (2 * leafStuff - R);
        }
        else {
            result += c * leafStuff;
        }
    }
    return result;
}

#ifdef TEST
#include "grader.cpp"
#endif

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