제출 #945282

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
945282		TrendBattles	Burza (COCI16_burza)	C++14	0 / 160	1 ms	1628 KiB

burza

//https://oj.uz/problem/view/COCI16_burza

#include <bits/stdc++.h>
using namespace std;
using lli = int64_t;

const int MAX_N = 400 + 5;
int dp[MAX_N][MAX_N][2];
int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int n, k; cin >> n >> k;
    vector <vector <int>> graph(n + 1);
    for (int i = 1; i < n; ++i) {
        int u, v; cin >> u >> v;
        graph[u].push_back(v);
        graph[v].push_back(u);
    }

    vector <int> parent(n + 1);
    auto DFS = [&] (auto DFS, int u) -> void {
        int leaf = true;
        for (int v : graph[u]) {
            if (v == parent[u]) continue;
            parent[v] = u;
            leaf = false;
            DFS(DFS, v);
        }

        if (leaf) {
            for (int i = 1; i <= k; ++i) dp[u][i][1] = true;
            dp[u][0][0] = true;
            return;
        }

        dp[u][0][0] = true;
        for (int plays = 1; plays <= k; ++plays) {
            dp[u][plays][0] = true;
            dp[u][plays][1] = true;
            for (int v : graph[u]) {
                if (v == parent[u]) continue;

                dp[u][plays][1] &= not dp[v][plays - 1][0];

                int current = false;
                for (int t : graph[u]) {
                    if (v == t or t == parent[u]) continue;

                    current |= not dp[t][plays][1];
                }   
                dp[u][plays][0] &= current;
            }
        }

        // cerr << "DEBUG: " << u << '\n';
        // for (int plays = 0; plays <= k; ++plays) cerr << dp[u][plays][0] << ' ' << dp[u][plays][1] << '\n';
    };
    DFS(DFS, 1);

    int ans = dp[1][k][1];
    cout << (ans ? "DA" : "NE");
    return 0;
}

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