Submission #424234

#	Time	Username	Problem	Language	Result	Execution time	Memory
424234		cfalas	Toy Train (IOI17_train)	C++14	11 / 100	845 ms	1740 KiB

train

#include "train.h"
#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;

#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto &v : a)
#define len(x) ((int)x.size())

vector<vi> adj;
vector<vi> rev;
vi vis;

vi r;

void dfs(int s){
	vis[s] = 1;
	for(auto v : adj[s]){
		if(!vis[v]) dfs(v);
	}
	vis[s] = 2;
}

vi who_wins(vi a, vi rr, vi u, vi v) {
	r = rr;
	int n = len(a);
	adj.assign(n, vi());
	rev.assign(n, vi());
	vis.assign(n,0);
	vi res(n, 0);

	FOR(i, len(u)){
		adj[u[i]].push_back(v[i]);
		rev[v[i]].push_back(u[i]);
	}
	set<int> loop;
	FOR(i,n){
		if(r[i]==0) continue;
		vis.assign(n,0);
		dfs(i);
		FOA(v,rev[i]) if(vis[v] && r[i]) loop.insert(i);
	}

	queue<int> q;
	vi used(n, 0);
	FOA(v,loop) q.push(v), used[v] = true;
	while(!q.empty()){
		int t = q.front();
		q.pop();
		res[t] = 1;
		FOA(v,rev[t]){
			if(!used[v]){
				used[v] = true;
				q.push(v);
			}
		}
	}

	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