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 int long long
using namespace std;
const int MAXN = 405, MAXK = 5, INF = 1e18;
int n, k, cnt, dep[MAXN], mn[MAXN], mx[MAXN], dp[1<<MAXK];
vector<int> adj[MAXN];
void dfs(int x, int p, int d) {
dep[x] = d;
if(d==k){
cnt++;
mn[x] = mx[x] = cnt;
return;
}
for(int y : adj[x]) {
if(y==p) continue;
dfs(y, x, d + 1);
mn[x] = min(mn[x], mn[y]);
mx[x] = max(mx[x], mx[y]);
}
}
signed main() {
cin.tie(NULL)->sync_with_stdio(0);
cin>>n>>k;
if(k>20) {
cout << "DA\n";
return 0;
}
for(int i = 1; i < n; i++) {
int x, y;
cin>>x>>y;
adj[x].push_back(y);
adj[y].push_back(x);
}
for(int i = 1; i <= n; i++) {
mn[i] = INF;
}
dfs(1, 0, 0);
for(int i= 0; i < (1<<(k+1)) - 1;i++) {
for(int j = 0;j < k; j++) {
if((i>>j)&1) {
int pr = dp[i^(1<<j)];
for(int i= 1; i <= n; i++) {
if(dep[i]!=j+1)continue;
int cmn = mn[i], cmx = mx[i];
if(cmn <= pr + 1) {
dp[i] = max(dp[i], cmx);
}
}
}
}
}
for(int i = 1; i < (1<<(k+1)) - 1; i++) {
if(dp[i] >= cnt) {
int counter = 0;
for(int j = 0; j < k; j++) {
if((i>>j)&1) counter++;
}
if(counter<=k) {
cout << "DA\n";
return 0;
}
}
}
cout << "NE\n";
}
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