Submission #1224378

#	Time	Username	Problem	Language	Result	Execution time	Memory
1224378		Malix	Toy Train (IOI17_train)	C++20	11 / 100	6 ms	1864 KiB

train

#include "train.h"
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> ti;
typedef vector<ll> li;
typedef vector<li> lii;
 
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define LSOne(s) ((s)&(-s))
#define all(x) (x).begin(),(x).end()
 
ll INF=1000000000000000010;
int inf=1e9+10;
ll M=1e9+7;

int n;
vii a,rev;
vi ans,arr,b,c,vis,vs;
set<int> st;

void dfs(int x){
	vis[x]=1;
	for(auto u:a[x])if(!vis[u])dfs(u);
	arr.PB(x);
}

bool dfs2(int x){
	vs[x]=1;
	st.insert(x);
	bool flag=0;
	for(auto u:a[x])if(c[u]==0){
		if(vs[u]==0)flag|=dfs2(u);
		else if(st.count(u))return 1;
	}
	st.erase(x);
	return flag;
}

std::vector<int> who_wins(std::vector<int> B, std::vector<int> R, std::vector<int> U, std::vector<int> V) {
	n=B.size();
	b=B;
	c=R;
	a.resize(n);rev.resize(n);
	ans.resize(n,-1);
	vs.resize(n,1);
	REP(i,0,U.size()){
		if(U[i]==V[i]&&R[U[i]]==0)ans[U[i]]=0;
		if(U[i]!=V[i]){
			rev[U[i]].PB(V[i]);     
			a[V[i]].PB(U[i]); 
		}     
	}
	vis.resize(n,0);
	REP(i,0,n)if(!vis[i])dfs(i);
	reverse(all(arr));
	vis.clear();vis.resize(n,0);
	a=rev;
	REP(i,0,n)if(!vis[arr[i]]){
		queue<int> q;
		vis[arr[i]]=1;
		q.push(arr[i]);
		vi brr;
		while(!q.empty()){
			int x=q.front();
			brr.PB(x);
			q.pop();
			for(auto u:a[x])if(!vis[u]){
				q.push(u);
				vis[u]=1;
			}
		}
		int f=1;
		for(auto u:brr){
			if(ans[u]==0)f=0;
			for(auto v:a[u])if(ans[v]==0)f=0;
			vs[u]=0;
		}
		REP(j,0,brr.size())if(c[brr[j]]==0&&vs[brr[j]]==0){
			st.clear();
			if(dfs2(brr[j]))f=0;
		}
		for(auto u:brr)ans[u]=f;
	}
	return ans;
}

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