This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<ll, ll> pii;
typedef pair<ld, ld> pld;
ll n, k;
vector<int> g[1009];
ll dfs(ll v, ll p){
if(g[v].size() == 1)
return 0;
vector<int> vec;
for(auto u : g[v]){
if(u == p)
continue;
vec.pb(dfs(u, v));
}
if(vec.size() <= 1)
return 0;
sort(vec.begin(), vec.end());
return 1+vec[vec.size()-2];
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
//freopen("in.txt", "r", stdin);
//freopen("out.txt", "w", stdout);
cin >> n >> k;
for(ll i = 0; i < n-1; ++i){
ll t1, t2;
cin >> t1 >> t2;
g[t1].pb(t2);
g[t2].pb(t1);
}
if(dfs(1, -1) < k){
cout << "DA\n";
}
else
cout << "NE\n";
}
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