Submission #964545

#	Time	Username	Problem	Language	Result	Execution time	Memory
964545		UmairAhmadMirza	Friend (IOI14_friend)	C++14	46 / 100	24 ms	4184 KiB

friend

#include <bits/stdc++.h>
using namespace std;
int const N=1005;
vector<int> adj[N];
int dp[N][2];
void dfs(int node,int par){
	for(auto i:adj[node]){
		if(i!=par){
			dfs(i,node);
			dp[node][0]+=max(dp[i][1],dp[i][0]);
			dp[node][1]+=dp[i][0];
		}
	}
}
int findSample(int n,int confidence[],int host[],int protocol[]){
	if(n<=10){
		map<pair<int,int>,bool> mp;
		for (int i = 1; i < n; ++i)
		{
			if(protocol[i]==0  || protocol[i]==2){
				if(mp[{host[i],i}])
					continue;
				// cout<<i<<' '<<host[i]<<endl;
				adj[host[i]].push_back(i);
				adj[i].push_back(host[i]);
				mp[{host[i],i}]=1;
				mp[{i,host[i]}]=1;
			}
			if(protocol[i]==1 || protocol[i]==2){
				for(auto j:adj[host[i]]){
					if(mp[{i,j}] || i==j)
						continue;
					// cout<<i<<' '<<j<<endl;
					adj[i].push_back(j);
					adj[j].push_back(i);
					mp[{i,j}]=1;
					mp[{j,i}]=1;
				}
			}
		}
		int ans=0;
		for (int mask = 1; mask < (1<<n); ++mask)
		{
			bool b=1;
			for (int i = 0; i < n; ++i)
				for (int j = i+1; j < n; ++j)
					if((mask)&(1<<j) && (mask)&(1<<i))
						if(mp[{i,j}])
							b=0;
			if(b==0)
				continue;
			int t=0;
			for (int i = 0; i < n; ++i)
				if(mask&(1<<i))
					t+=confidence[i];
			// cout<<mask<<' '<<t<<endl;
			ans=max(ans,t);
		}
		return ans;
	}
	int ans=0;
	int maxa=0;
	for (int i = 0; i < n; ++i){
		ans+=confidence[i];
		maxa=max(confidence[i],maxa);
		dp[i][1]=confidence[i];
	}
	if(protocol[1]==2)
		return maxa;
	if(protocol[1]==1)
		return ans;
	//solve for tree
	for (int i = 1; i < n; ++i)
	{
		adj[host[i]].push_back(i);
		adj[i].push_back(host[i]);
	}
	dfs(0,-1);
	return max(dp[0][0],dp[0][1]);
}

• Subtask 1: 11 / 11
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 19 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31