Submission #69900

#	Time	Username	Problem	Language	Result	Execution time	Memory
69900		bnahmad15	Toy Train (IOI17_train)	C++17	0 / 100	1189 ms	1760 KiB

train

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

const int N = 5001;
int n,vis[N],tim[N],cnt = 0;
int is[N],no[N],can[N];
vector <int> g[N];

int dfs(int u,int found){
	tim[u] = ++cnt;
	vis[u] = 1;
	no[tim[u]] = 1;
	int res = 0;
	if(is[u] == 1)
		found = tim[u];
//	cout<<u<<" "<<is[u]<<" "<<found<<" "<<cnt<<endl;
	for(int i = 0;i<g[u].size();i++){
		int v = g[u][i];
		if(vis[v] == 2){
//			cout<<res<<" ";
			continue;
		}
		else if(vis[v] == 1){
			res = max(res,no[found] & (found >= tim[v]) ? 1 : 0);
//			cout<<res<<" ";
			continue;
		}else{
			res = max(res,dfs(v,found));
		}
//		cout<<res<<" ";
	}
//	cout<<endl;
	no[tim[u]] = 0;
	vis[u] = 2;
	can[u] |= res;
	return res;
}
std::vector<int> who_wins(std::vector<int> a, std::vector<int> r, std::vector<int> u, std::vector<int> v) {

	std::vector<int> res;
	n = a.size();
	for(int i = 0;i<n;i++){
		can[i] = 0;
		is[i] = 0;
	}
	for(int i = 0;i<r.size();i++){
		if(r[i] == 1)
			is[i] = 1;
	}
	for(int i = 0;i<u.size();i++){
		g[u[i]].push_back(v[i]);
	}
	for(int i = 0;i<n;i++){
		if(can[i] == 1){
			res.push_back(1);
		}else{
			for(int j = 0;j<n;j++){
				vis[j] = 0;
				tim[j] = -1;
				no[j] = 0;
			}
			cnt = 0;
			res.push_back(dfs(i,-1));			
		}
//		cout<<endl;
	}
	return res;
}

Compilation message (stderr)

train.cpp: In function 'int dfs(int, int)':
train.cpp:18:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0;i<g[u].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:47:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0;i<r.size();i++){
                ~^~~~~~~~~
train.cpp:51:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0;i<u.size();i++){
                ~^~~~~~~~~

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