Submission #1232338

#	Time	Username	Problem	Language	Result	Execution time	Memory
1232338		bangan	Tree (IOI24_tree)	C++20	10 / 100	2095 ms	24992 KiB

tree

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

#define pb push_back
#define ll long long

const int N = 2e5 + 4;

int n;
vector<int> p, w;
vector<int> adj[N];

ll ans;
ll dfs(int v, ll l, ll r) {
    if (adj[v].empty()) {
        ans += l * w[v];
        return l;
    }
    ll sum = 0;
    for (int u : adj[v]) sum += dfs(u, l, r);
    if (v==0 || w[p[v]] <= w[v]) {
        ll t = max(0ll, sum - r);
        ans += t * w[v];
        sum -= t;
        return sum;
    }
    else {
        ll t = sum - l;
        ans += t * w[v];
        sum -= t;
        return sum;
    }
}

void init(std::vector<int> P, std::vector<int> W) {
    n = P.size();
    p = P;
    w = W;
    for (int i=1; i<n; i++) adj[p[i]].pb(i);
}   

long long query(int L, int R) {
    ans = 0;
    dfs(0, L, R);
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 10 / 10
• Subtask 2: 0 / 13
• Subtask 3: 0 / 18
• Subtask 4: 0 / 7
• Subtask 5: 0 / 11
• Subtask 6: 0 / 22
• Subtask 7: 0 / 19