Submission #1071331

#TimeUsernameProblemLanguageResultExecution timeMemory
1071331Faisal_SaqibBeech Tree (IOI23_beechtree)C++17
5 / 100
98 ms22940 KiB
#include <bits/stdc++.h>
using namespace std;
const int N1=2e5+100;
int n,m,p[N1],c[N1],cnt[N1];
vector<int> sub[N1],ma[N1];
void dfs(int x)
{
	sub[x].clear();
	for(int&y:ma[x])
	{
		dfs(y);
		for(int&l:sub[y])sub[x].push_back(l);
		sub[x].push_back(y);
	}
}
std::vector<int> beechtree(int N, int M, std::vector<int> P, std::vector<int> C)
{
	n=N,m=M;
	bool subtask=1;
	for(int i=0;i<n;i++)p[i]=P[i],c[i]=C[i],ma[i].clear(),subtask=(subtask&((p[i]==(i-1))));
	// if(subtask)
	// {
		vector<int> b(n);
		map<int,int> cntp;
		for(int i=n-1;i>=0;i--)
		{
			cntp[c[i]]++;
			if(cntp.size()==1)
			{
				b[i]=1;
			}
			else if(cntp.size()==2 and min(cntp[c[i]],n-cntp[c[i]])==1)
			{
				b[i]=1;
			}
			else{
				b[i]=0;
			}
		}
		return b;
	// }
	// else
	// {
	// 	for(int i=1;i<n;i++)ma[p[i]].push_back(i);
	// 	dfs(0);
	// 	vector<int> b(n);
	// 	for(int i=0;i<n;i++)
	// 	{
	// 		int sz=sub[i].size();
	// 		map<int,int> cntp;
	// 		for(int j=0;j<sz;j++)
	// 		{
	// 			int v=sub[i][j];
	// 			cntp[c[v]]++;
	// 		}
	// 		cntp[c[i]]++;
	// 		if(cntp.size()==1)
	// 		{
	// 			b[i]=1;
	// 		}
	// 		else if(cntp.size()==2 and min(cntp[c[i]],n-cntp[c[i]])==1)
	// 		{
	// 			b[i]=1;
	// 		}
	// 		else{
	// 			b[i]=0;
	// 		}
	// 	}
	// 	return b;
	// }
}
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