Submission #956091

#TimeUsernameProblemLanguageResultExecution timeMemory
956091Trisanu_DasBurza (COCI16_burza)C++17
160 / 160
385 ms281676 KiB
#include <bits/stdc++.h> using namespace std; const int mxn=405,mxb=20; int n,k,st[mxn],fn[mxn],dis[mxn],par[mxn],cnt=0; vector<int>v[mxn],now,leaf; bool dp[mxn][(1<<mxb)],ans=0; void dfs(int z){ st[z]=++cnt; if(dis[z]<=k-1) now.push_back(z); if(dis[z]==k-1) leaf.push_back(st[z]); for(auto i:v[z]){ if(par[z]!=i){ par[i]=z; dis[i]=dis[z]+1; dfs(i); } } fn[z]=cnt; } int main(){ ios::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin>>n>>k; for(int i=1;i<n;i++){ int x,y; cin>>x>>y; v[x].push_back(y); v[y].push_back(x); } dis[1]=-1; dfs(1); leaf.push_back(n+1); for(auto i:now) dp[leaf.size()-1][0]=1; for(int i=now.size()-1;i>=1;i--){ int d=dis[now[i]],l=st[now[i]],r=fn[now[i]]+1; int L=lower_bound(leaf.begin(),leaf.end(),l)-leaf.begin(); int R=lower_bound(leaf.begin(),leaf.end(),r)-leaf.begin(); for(int w=0;w<(1<<mxb);w++) if(w&(1<<d)) dp[L][w]|=dp[R][w-(1<<d)]; } for(int w=0;w<(1<<mxb);w++) ans|=dp[0][w]; if(ans) cout<<"DA"; else cout<<"NE"; }

Compilation message (stderr)

burza.cpp: In function 'int main()':
burza.cpp:34:11: warning: unused variable 'i' [-Wunused-variable]
   34 |  for(auto i:now)
      |           ^
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