Submission #790285

#	Time	Username	Problem	Language	Result	Execution time	Memory
790285		Valaki2	Toy Train (IOI17_train)	C++14	0 / 100	300 ms	1432 KiB

train

#include "train.h"
#include <bits/stdc++.h>
using namespace std;

#define pb push_back

const int maxn = 5000;

int n, m;
vector<int> g[1 + maxn], rg[1 + maxn];
int own[1 + maxn], charge[1 + maxn];
bool has_self[1 + maxn];

int charged;
bool good[1 + maxn];
bool good_cycle;

void decide() {
	for(int i = 1; i <= n; i++) {
		if(charge[i]) {
			charged = i;
		}
	}
	good[charged] = true;
	for(int iter = 1; iter <= n; iter++) {
		for(int cur = 1; cur <= n; cur++) {
			bool this_good;
			if(own[cur] == 1) {
				this_good = false;
				for(int nei : rg[cur]) {
					if(good[nei]) {
						this_good = true;
					}
				}
			} else {
				this_good = true;
				for(int nei : rg[cur]) {
					if(!good[nei]) {
						this_good = false;
					}
				}
			}
			if(this_good) {
				good[cur] = true;
				if(cur == charged) {
					good_cycle = true;
				}
			}
		}
	}
}

vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v) {
	n = a.size();
	m = u.size();
	for(int i = 0; i < m; i++) {
		g[u[i] + 1].pb(v[i] + 1);
		rg[v[i] + 1].pb(u[i] + 1);
		if(u[i] == v[i]) {
			has_self[u[i] + 1] = true;
		}
	}
	for(int i = 1; i <= n; i++) {
		own[i] = a[i - 1];
		charge[i] = r[i - 1];
	}
	decide();
	vector<int> res(n);
	if(good_cycle) {
		for(int i = 0; i < n; i++) {
			res[i] = good[i + 1];
		}
	}
	return res;
}

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