Submission #72905

#	Time	Username	Problem	Language	Result	Execution time	Memory
72905		Navick	Toy Train (IOI17_train)	C++17	11 / 100	17 ms	2092 KiB

train

#include <bits/stdc++.h>
#include "train.h"

#define F first
#define S second
#define pii pair<int, int>
#define pb push_back

using namespace std;

typedef long long ll;
typedef long double ld;

const int maxN = 5e3 + 10;

bool t[maxN];
int num[maxN], c[maxN], a[maxN], sz[maxN];

vector <int> adj[maxN], rev[maxN], topol;
bool mark[maxN];

void DFS(int v)
{
	mark[v] = true;
	for (auto u : adj[v])
		if(!mark[u]) DFS(u);
	topol.pb(v);
}

void SFD(int v, int comp)
{
	mark[v] = true;
	sz[comp] ++;
	num[v] = comp;

	for (auto u : rev[v])
		if(!mark[u]) SFD(u, comp);
}

void sfd(int v)
{
	mark[v] = true;
	for (auto u : rev[v])
		if(!mark[u]) sfd(u);
}

std::vector<int> who_wins(std::vector<int> A, std::vector<int> r, std::vector<int> u, std::vector<int> v) {
	int n = A.size(), m = u.size();
	
	for (int i=0; i<n; i++) c[i] = r[i], a[i] = A[i];

	for (int i=0; i<m; i++)
	{
		adj[u[i]].pb(v[i]);
		rev[v[i]].pb(u[i]);
	
		if(u[i] == v[i]) t[u[i]] = true;
	}

	for (int i=0; i<n; i++)
		if(!mark[i]) DFS(i);

	reverse(topol.begin(), topol.end());
	memset(mark, 0, sizeof mark);
	
	int id = 0;
	for (auto v : topol)
		if(!mark[v]){
			SFD(v, id);
			id ++;
		}

	memset(mark, 0, sizeof mark);
	for (int i=0; i<n; i++)
	{
		if(!c[i]) continue ;
		int id = num[i];
		if(sz[id] > 1 || t[i]) sfd(i);
	}

	vector <int> ans;

	for (int i=0; i<n; i++)
		ans.pb(mark[i]);

	return ans;

}

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