Submission #1076906

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076906		Gray	Toy Train (IOI17_train)	C++17	0 / 100	7 ms	1980 KiB

train

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

using namespace std;

#define ll int
#define ff first
#define ss second
#define ln "\n"
#define ld long double

vector<ll> are;
vector<ll> isc;
vector<pair<ll, ll>> edge;
vector<vector<ll>> A;
ll n, m;

void dfs(ll u, vector<ll> &vis, vector<ll> &dp, vector<ll> &cnt, ll top){
	cnt[u]=top;
	if (isc[u]) top++;
	vis[u]=1;
	dp[u]=0;
	for (auto i:A[u]){
		ll v = edge[i].ff^edge[i].ss^u;
		if (vis[v]==1) {
			if (cnt[v]==top) dp[u]=1;
			continue;
		}else if (vis[v]==0){
			dfs(v, vis, dp, cnt, top);
		}
		dp[u]|=dp[v];
	}
	vis[u]=2;
}
void order(ll u, vector<ll> &vis, vector<ll> &ord){
	vis[u]=1;
	for (auto i:A[u]){
		ll v = edge[i].ff^edge[i].ss^u;
		if(!vis[v]) order(v, vis, ord);
	}
	ord.push_back(u);
}
vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v) {
	n=a.size(); m=v.size();
	isc=r; are=a;
	A.clear(); A.resize(n);
	edge.clear(); edge.resize(m);
	for (ll i=0; i<m; i++){
		edge[i] = {u[i], v[i]};
		A[u[i]].push_back(i);
	}
	vector<ll> vis(n), dp(n), cnt(n);
	vector<ll> ord;
	for (ll i=0; i<n; i++){
		if (!vis[i]) order(i, vis, ord);
	}
	vis.assign(n, 0);
	reverse(ord.begin(), ord.end());
	for (auto i:ord){
		if (!vis[i]){
			dfs(i, vis, dp, cnt, 0);
		}
	}
	for (ll i=0; i<n; i++) dp[i]=!dp[i];
	return dp;
}

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