제출 #687856

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
687856		2vas	Burza (COCI16_burza)	C++17	0 / 160	1 ms	340 KiB

burza

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

void solve();

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    int t=1; // cin >> t;
    while(t--) {
        solve();
    }
    return 0;
}

int n, k;
const int MXN = 400;
vector<int> edges[MXN];

bool dfs(int i, int parent, int depth) {
    if (depth >= k) return false;

    bool alreadyChildFalse = false;
    for (int v : edges[i]) {
        if (v == parent) continue;
        if (dfs(v, i, depth+1)) continue;

        if (alreadyChildFalse) return false;
        alreadyChildFalse = true;
    }

    return true;
}

void solve() {    
    cin >> n >> k;
    for (int i = 0; i < n - 1; i++) {
        int x, y; cin >> x >> y;
        x--;
        y--;
        edges[x].push_back(y);
        edges[y].push_back(x);
    }

    if (dfs(0, -1, 0)) {
        cout << "DA" << endl;
    } else {
        cout << "NE" << endl;
    }
}

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