제출 #936857

#제출 시각아이디문제언어결과실행 시간메모리
936857amirhoseinfar1385Burza (COCI16_burza)C++17
160 / 160
5 ms2652 KiB
#pragma GCC optimize ("O3") #pragma GCC target ("sse4") #include<bits/stdc++.h> using namespace std; const int maxn=405,sq=20; int n,k; vector<int>adj[maxn],dp[maxn]; int cnt[(1<<sq)],nag[maxn],high[maxn],sz,par[maxn]; vector<pair<int,int>>updy[maxn],unnow; pair<int,int>stf[maxn]; set<pair<int,int>>st; void vorod(){ cin>>n>>k; for(int i=0;i<n-1;i++){ int u,v; cin>>u>>v; adj[u].push_back(v); adj[v].push_back(u); } if(k>=20){ cout<<"DA\n"; exit(0); } } void del(int u,int x,int len){ if(u==0||x==0){ return ; } sort(adj[u].begin(),adj[u].end()); adj[u].erase(lower_bound(adj[u].begin(),adj[u].end(),x)); if((int)adj[u].size()==0){ st.insert(make_pair(len,u)); } } void dfs(int u,int len=0,int para=0){ del(u,para,len); if(len==k){ adj[u].clear(); } for(auto x:adj[u]){ par[x]=u; dfs(x,len+1,u); } if((int)adj[u].size()==0){ st.insert(make_pair(len,u)); } } void dfs2(int u=1,int len=0){ if(adj[u].size()==0){ sz++; nag[sz]=u; stf[u].first=stf[u].second=sz; return ; } stf[u].first=sz+1; for(auto x:adj[u]){ dfs2(x,len+1); } stf[u].second=sz; } void pre(){ dfs(1); //cout<<"wtf"<<endl; while((int)st.size()>0&&((*st.begin()).first<k)){ int u=(*st.begin()).second,v=(*st.begin()).first; st.erase(*st.begin()); del(par[u],u,v-1); } //cout<<"salam"<<endl; if((int)st.size()==0){ cout<<"DA\n"; exit(0); } dfs2(); } void add(int i,int val){ if(val>=(1<<sq)){ exit(0); } //cout<<i<<" "<<val<<" "<<sz<<endl; if(cnt[val]==0){ cnt[val]++; dp[i].push_back(val); } } void cl(int i){ for(auto x:dp[i]){ cnt[x]=0; } } void solve(){ for(int i=1;i<=sz;i++){ int u=nag[i]; for(int j=k;j>=1;j--){ //cout<<i<<" "<<u<<" "<<stf[u].first<<" "<<stf[u].second<<endl; if(stf[u].second==i){ // cout<<"salam: "<<i<<" "<<j<<endl; updy[i].push_back(make_pair(stf[u].first-1,j)); } u=par[u]; } for(auto x:updy[i]){ // cout<<"chy: "<<i<<" "<<x.first<<" "<<x.second<<endl; if(x.first==0){ add(i,(1<<x.second)); continue; } int ind=x.first,z=x.second; for(auto y:dp[ind]){ if(((y>>z)&1)==0){ add(i,(1<<z)^y); } } } cl(i); } } void khor(){ if((int)dp[sz].size()==0){ cout<<"NE\n"; }else{ cout<<"DA\n"; } } int main(){ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); // freopen("inp.txt","r",stdin); vorod(); pre(); //cout<<"salam"<<endl; solve(); khor(); }
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