Submission #952005

#TimeUsernameProblemLanguageResultExecution timeMemory
952005vjudge1Museum (CEOI17_museum)C++17
0 / 100
46 ms265524 KiB
#include<bits/stdc++.h> using namespace std; #define N 10005 #define son v.first #define len v.second inline int read(){ int re=0,f=1; char ch=getchar(); while(!isdigit(ch)){ if(ch=='-'){ f=-1; } ch=getchar(); } while(isdigit(ch)){ re=re*10+ch-'0'; ch=getchar(); } return re*f; } int dp[N][N][2]; int n,p,Son[N],rt; vector<pair<int,int>> G[N]; inline void dfs(int now,int fa){ dp[now][1][1]=dp[now][1][0]=0; Son[now]=1; for(auto&v:G[now]){ if(son!=fa){ dfs(son,now); for(int i=min(p,Son[now]);i>0;i--){ if(i-1<=Son[son]){ dp[now][i][1]=min(dp[now][i][1],dp[son][i-1][1]+len); dp[now][i][0]=min(dp[now][i][0],dp[son][i-1][0]+2*len); } for(int j=min({p,Son[son],i});j>=0;j--){ dp[now][i][0]=min(dp[now][i][0],dp[now][i-j][0]+dp[son][j][0]+2*len); dp[now][i][1]=min(dp[now][i][1],dp[now][i-j][0]+dp[son][j][1]+len); dp[now][i][1]=min(dp[now][i][1],dp[now][i-j][1]+dp[son][j][0]+2*len); } } Son[now]+=Son[son]; } } } signed main(){ n=read();p=read();rt=read(); for(int i=1,x,y,z;i<n;i++){ x=read();y=read();z=read(); G[x].push_back(make_pair(y,z)); G[y].push_back(make_pair(x,z)); } for(int i=0;i<=n;i++){ for(int j=0;j<=p;j++){ dp[i][j][1]=dp[i][j][0]=1e9; } } dfs(rt,0); // for(int i=1;i<=n;i++){ // for(int j=1;j<=p;j++){ // cout<<i<<" visit "<<j<<" :"<<dp[i][j][0]<<" "<<dp[i][j][1]<<endl; // } // } printf("%d",min(dp[rt][p][1],dp[rt][p][0])); }
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...