제출 #701994

#제출 시각아이디문제언어결과실행 시간메모리
701994PCTprobability친구 (IOI14_friend)C++17
0 / 100
4 ms5204 KiB
#include <bits/stdc++.h> #include "friend.h" using namespace std; using ll = long long; #define pb push_back vector<int> g[100000]; int dp[100000][2]; int pro[100000]; void dfs(int a,int b){ for(auto e:g[a]){ if(e==b) continue; dfs(e,a); dp[a][0]+=max(dp[e][0],dp[e][1]); dp[a][1]+=dp[e][0]; } dp[a][1]+=pro[a]; } int findSample(int n, int confidence[], int host[], int protocol[]){ for(int i=0;i<n;i++) pro[i]=protocol[i]; bool allzero=true; for(int i=1;i<n;i++){ if(protocol[i]!=0) allzero=false; } if(allzero){ for(int i=1;i<n;i++){ g[host[i]].pb(i); g[i].pb(host[i]); } dfs(0,-1); return max(dp[0][0],dp[0][1]); } assert(n<=10); vector<vector<int>> a(n,vector<int>(n)); for(int i=1;i<n;i++){ if(protocol[i]==0){ a[i][host[i]]=a[host[i]][i]=1; } if(protocol[i]==1){ for(int j=0;j<n;j++){ if(a[host[i]][j]){ a[i][j]=a[j][i]=1; } } } if(protocol[i]==2){ for(int j=0;j<n;j++){ if(a[host[i]][j]){ a[i][j]=a[j][i]=1; } } a[i][host[i]]=a[host[i]][i]=1; } } int ans=0; for(int i=0;i<(1<<n);i++){ int sum=0,ok=1; for(int j=0;j<n;j++){ if((i>>j)&1){ sum+=confidence[j]; for(int k=j+1;k<n;k++){ if((i>>k)&1){ if(a[j][k]) ok=0; } } } } ans=max(ans,sum*ok); } return ans; }
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