Submission #72860

#	Time	Username	Problem	Language	Result	Execution time	Memory
72860		Sa1378	Toy Train (IOI17_train)	C++17	11 / 100	21 ms	4908 KiB

train

#include "train.h"
#include <bits/stdc++.h>
using namespace std;
#define N ((int)11*1000)

int n,m,cnt;
bool self[N],ans[N],mark[N],flg;
vector <int> e[N],er[N],tpl;

void dfs(int x)
{
	mark[x]=1;
	for(auto u:e[x])
		if(!mark[u])
			dfs(u);
	tpl.push_back(x);
}

void dfs2(int x,vector <int> &r)
{
	mark[x]=1;
	cnt++;flg|=r[x];
	for(auto u:er[x])
		if(!mark[u])
			dfs2(u,r);
}

void dfs_ans(int x)
{
	ans[x]=1;
	for(auto u:er[x])
		if(!ans[u])
			dfs_ans(u);
}

vector<int> who_wins(vector<int> a,vector<int> r,vector<int> u,vector<int> v)
{
	int n=a.size(),m=u.size();
	for(int i=0;i<m;i++)
	{
		if(u[i]==v[i])self[u[i]]=1;
		else e[u[i]].push_back(v[i]),er[v[i]].push_back(u[i]);
	}
	for(int i=0;i<n;i++)
		if(!mark[i])
			dfs(i);
	reverse(tpl.begin(),tpl.end());
	memset(mark,0,sizeof mark);
	for(auto u:tpl)
		if(!mark[u])
		{
			flg=0;cnt=0;
			dfs2(u,r);
			if(flg && (cnt>1 || self[u]))dfs_ans(u);
		}
	vector <int> res;
	for(int i=0;i<n;i++)res.push_back(ans[i]);
	return res;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 11 / 11
• Subtask 4: 0 / 11
• Subtask 5: 0 / 12
• Subtask 6: 0 / 51