Submission #730396

#	Time	Username	Problem	Language	Result	Execution time	Memory
730396		USER	Cat in a tree (BOI17_catinatree)	C++14	100 / 100	103 ms	21808 KiB

catinatree

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

int n, k;
vector <int> g[200001];

pair <int, int> dfs(int nod = 0) {

    vector <int> v;
    int ret = 1;
    v.push_back(0);

    for (auto &i : g[nod]) {

        pair <int, int> aux = dfs(i);
        v.push_back(aux.first);
        ret += aux.second;
    }

    sort(v.begin(), v.end());

    int i = 0;
    while (v.size() - i > 1 && v[i] + v[i + 1] < k)
        i++, ret--;

    return {v[i] + 1, ret};
}

int main() {

    cin >> n >> k;

    for (int i = 1; i < n; i++) {

        int x;
        cin >> x;

        g[x].push_back(i);
    }

    cout << dfs().second;

    return 0;
}

• Subtask 1: 11 / 11
• Subtask 2: 40 / 40
• Subtask 3: 49 / 49