Submission #698579

#	Time	Username	Problem	Language	Result	Execution time	Memory
698579		bogdanvladmihai	Cat in a tree (BOI17_catinatree)	C++14	100 / 100	102 ms	20416 KiB

catinatree

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

int N, K;
vector<vector<int>> G, children;

pair<int, int> dfs(int u, int D) {
    if (children[u].empty()) {
        return make_pair(1, 1);
    }
    pair<int, int> answer = dfs(children[u][0], D);
    answer = (answer.second == D ? make_pair(answer.first + 1, 0) : answer);
    for (int i = 1; i < (int)children[u].size(); i++) {
        auto child = dfs(children[u][i], D);
        answer.first += child.first;
        if (answer.second + child.second >= D) {
            answer.second = min(answer.second, child.second);
        } else {
            answer.first--;
            answer.second = max(answer.second, child.second);
        }
    }
    answer.second++;
    return answer;
}

int main() {
    cin >> N >> K;
    G.resize(N);
    children.resize(N);
    for (int i = 1; i < N; i++) {
        int v; cin >> v;
        children[v].push_back(i);
    }
    cout << dfs(0, K).first << "\n";
    return 0;
}

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