Submission #64822

#	Time	Username	Problem	Language	Result	Execution time	Memory
64822		mohammad_kilani	Toy Train (IOI17_train)	C++17	11 / 100	2047 ms	3400 KiB

train

#include "train.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 5010;
vector< int > res , a , g[N] , r;
int n , vis[N] , vi = 0 , last;

bool DFS(int node){
	vis[node] = vi;
	if(a[node] == 0 && r[node])
		return false;
	if(node == last)
		return true;
	for(int i=0;i<g[node].size();i++){
		if(vis[g[node][i]] != vi && a[g[node][i]] == a[last]){
			if(DFS(g[node][i]))
				return true;
		}
	}
	return false;
}

bool DFS2(int node){
	vis[node] = vi;
	if(res[node] == a[last])
		return true;
	for(int i=0;i<g[node].size();i++){
		if(vis[g[node][i]] != vi && a[g[node][i]] == a[last]){
			if(DFS2(g[node][i]))
				return true;
		}
	}
	return false;
}

bool DFS3(int node){
	vis[node] = vi;
	if(res[node] != -1)
		return false;
	if(a[node] != a[last])
		return true;
	for(int i=0;i<g[node].size();i++){
		if(vis[g[node][i]] != vi)
			if(DFS3(g[node][i]))
				return true;
	}
	return false;
}

std::vector<int> who_wins(std::vector<int> A, std::vector<int> R, std::vector<int> u, std::vector<int> v) {
	a = A;
	n = (int)a.size();
	r = R;
	res.resize(n , -1);
	for(int i = 0;i<(int)u.size();i++){
		g[u[i]].push_back(v[i]);
	}
	for(int i=0;i<n;i++){
		last = i;
		vi++;
		if(a[i] == 0 || r[i]){
			for(int j = 0;j<g[i].size();j++){
				if(a[g[i][j]] == a[i] && vis[g[i][j]] != vi && DFS(g[i][j])){
					res[i] = a[i];
					break;
				}
			}
		}
	}
	for(int i=0;i<n;i++){
		if(res[i] != -1) continue;
		last = i;
		vi++;
		if(DFS2(i))
			res[i] = a[i];
	}
	for(int i=0;i<n;i++){
		if(res[i] == -1){
			vi++;
			last = i;
			if(!DFS3(i))
				res[i] = a[i] ^ 1;
		}
	}
	return res;
}

Compilation message (stderr)

train.cpp: In function 'bool DFS(int)':
train.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[node].size();i++){
              ~^~~~~~~~~~~~~~~
train.cpp: In function 'bool DFS2(int)':
train.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[node].size();i++){
              ~^~~~~~~~~~~~~~~
train.cpp: In function 'bool DFS3(int)':
train.cpp:42:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[node].size();i++){
              ~^~~~~~~~~~~~~~~
train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:62:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j = 0;j<g[i].size();j++){
                  ~^~~~~~~~~~~~

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