Submission #428657

#	Time	Username	Problem	Language	Result	Execution time	Memory
428657		vanic	Toy Train (IOI17_train)	C++14	11 / 100	475 ms	1860 KiB

train

#include "train.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstring>

using namespace std;

const int maxn=5005;

int n, m;
vector < int > ms[maxn];
vector < int > rev[maxn];
int charge[maxn];
int tko[maxn];
bool bio[maxn];
vector < int > sol;
int poc;

int dfs(int x){
	if(bio[x] && x==poc){
		return 1;
	}
	if(bio[x]){
		return 0;
	}
	bio[x]=1;
	for(int i=0; i<(int)ms[x].size(); i++){
		if(dfs(ms[x][i])){
			return 1;
		}
	}
	return 0;
}

void nazad(int x){
	if(sol[x]){
		return;
	}
	sol[x]=1;
	for(int i=0; i<(int)rev[x].size(); i++){
		nazad(rev[x][i]);
	}
}


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<n; i++){
		tko[i]=a[i];
		charge[i]=r[i];
	}
	for(int i=0; i<m; i++){
		ms[u[i]].push_back(v[i]);
		rev[v[i]].push_back(u[i]);
	}
	sol.resize(n, 0);
	for(int i=0; i<n; i++){
		if(charge[i]){
			poc=i;
			if(dfs(i)){
				nazad(i);
			}
			memset(bio, 0, sizeof(bio));
		}
	}
	return sol;
}

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