Submission #70051

#	Time	Username	Problem	Language	Result	Execution time	Memory
70051		bnahmad15	Toy Train (IOI17_train)	C++17	0 / 100	11 ms	1184 KiB

train

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

const int N = 5001;
int n,is[N],vis[N],own[N];
vector <int> g[N],S;

int dfs(int u){
	vis[u] = 1;
	S.push_back(u);
	int ret = 0;
	if(own[u] == 0)
		ret = 1;
	for(int i = 0;i < g[u].size();i++){
		int v = g[u][i];
		if(vis[v] == 1){
			bool flag = true;
			for(int j = S.size()-1;j>=0;j--){
				if(is[S[j]] == 1){
					flag = false;
					if(own[u] == 1)
						return 1;
					break;
				}
				if(S[j] == v)
					break;
			}
			if(flag && own[u] == 0)
				return 0;
			continue;
		}else{
			if(own[u] == 1)
				ret = max(ret,dfs(v));
			else
				ret = min(ret,dfs(v));
		}
	}
	vis[u] = 0;
	S.pop_back();
	return ret;
}
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++){
		is[i] = 0;
	}
	for(int i = 0;i<u.size();i++){
		g[u[i]].push_back(v[i]);
	}
	for(int i = 0;i<n;i++)
		is[i] = r[i];
	for(int i = 0;i<n;i++)
		own[i] = a[i];
	if(n <= 15){
		int cnt = 0;
		for(int i = 0;i<n;i++){
			for(int j = 0;j<n;j++){
				vis[j] = 0;
			}
			cnt++;
			res.push_back(dfs(i));
		}
		assert(cnt == n);
	}
	return res;
}

Compilation message (stderr)

train.cpp: In function 'int dfs(int)':
train.cpp:15:18: 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:50:17: 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