제출 #313520

#제출 시각아이디문제언어결과실행 시간메모리
313520juggernaut친구 (IOI14_friend)C++14
46 / 100
39 ms4352 KiB
#include"friend.h" //#include"grader.cpp" #include<bits/stdc++.h> using namespace std; vector<int>g[1005]; bool can[15][15]; int dp[1005][2],conf[1005],c1,c2; bool vis[1005]; void add(int x,int y){ g[x].push_back(y); g[y].push_back(x); } void dfs(int v,int p){ dp[v][0]=dp[v][1]=0; dp[v][1]+=conf[v]; for(int to:g[v]) if(to!=p){ dfs(to,v); dp[v][0]+=max(dp[to][0],dp[to][1]); dp[v][1]+=dp[to][0]; } } int findSample(int n,int C[],int host[],int protocol[]){ copy(C,C+n,conf); for(int i=1;i<n;i++){ if(protocol[i]==0){ add(host[i],i); }else if(protocol[i]==1){ for(int to:g[host[i]])add(i,to); }else if(protocol[i]==2){ for(int to:g[host[i]])add(i,to); add(host[i],i); } } if(n<11){ for(int i=0;i<n;i++)for(int to:g[i])can[i][to]=1,can[to][i]=1; int mx=0,sum; for(int mask=0;mask<(1<<n);mask++){ sum=0; for(int i=0;i<n;i++) if(mask>>i&1){ sum+=conf[i]; for(int j=0;j<n;j++)if((mask>>j&1)&&can[i][j])sum=-2e9; } mx=max(mx,sum); } return mx; }else{ int i,cnt[3]={0,0,0}; for(i=1;i<n;i++) cnt[protocol[i]]++; if(cnt[0]==n-1){ dfs(0,0); return max(dp[0][0],dp[0][1]); }else if(cnt[1]==n-1){ int sum=0; for(int i=0;i<n;i++)sum+=conf[i]; return sum; }else if(cnt[2]==n-1){ int sum=0; for(int i=0;i<n;i++)sum=max(sum,conf[i]); return sum; }else{ int i,res=0; for(i=0;i<n;i++){ if(vis[i])continue; res++; vis[i]=1; for(int to:g[i])vis[to]=1; } return res; } } }
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