/**
* author : Lăng Trọng Đạt
* created: 13-06-2025
**/
#include <bits/stdc++.h>
using namespace std;
#ifndef LANG_DAT
#define db(...) ;
#endif // LANG_DAT
#define int long long
#define f first
#define se second
#define pb push_back
#define all(v) (v).begin(), (v).end()
#define FOR(i, a, b) for (int i = (a); (i) <= (b); (i++))
#define FD(i, lo, up) for (int i = (up); (i) >= (lo); i--)
#define si(x) (int)(x.size())
bool mx(int& a, int b) { if (b > a) {a = b; return true;} return false;}
bool mi(int& a, int b) { if (b < a) {a = b; return true;} return false;}
using pii = pair<int, int>;
const int INF = 1e18 + 5;
const int MOD = 1e9 + 7;
const int N = 1e6 + 5;
int g[N], d[N];
int n, m, k, q, a, b, c;
vector<int> adj[N];
bool ok(int v, int prv) {
if (d[v] == k) return false;
int cnt = 0;
for (int u : adj[v]) {
if (u == prv) continue;
d[u] = d[v] + 1;
if (!ok(u, v)) {
cnt++;
}
}
return cnt <= 1;
}
int32_t main() {
cin.tie(0)->sync_with_stdio(0);
if (fopen("hi.inp", "r")) {
freopen("hi.inp", "r", stdin);
// freopen("hi.out", "w", stdout);
}
cin >> n >> k;
FOR(i, 1, n - 1) {
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
}
// ok(1, -1);
cout << (ok(1, -1) ? "DA" : "NE");
}
Compilation message (stderr)
burza.cpp: In function 'int32_t main()':
burza.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
46 | freopen("hi.inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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