Submission #311959

#	Time	Username	Problem	Language	Result	Execution time	Memory
311959		tzxydby	Stations (IOI20_stations)	C++14	0 / 100	876 ms	768 KiB

stations

#include"stations.h"
#include<bits/stdc++.h>
using namespace std;
const int N=1005;
vector<int>e[N],a;
int c;
void dfs(int u,int f,int d)
{
	if(d)
		a[u]=c++;
	for(auto v:e[u])
		if(v!=f)
			dfs(v,u,d^1);
	if(!d)
		a[u]=c++;
}
vector<int> label(int n,int k,vector<int>u,vector<int>v)
{
	a.assign(n,0);
	for(int i=0;i<n;i++)
		e[i].clear();
	c=0;
	for(int i=0;i<n-2;i++)
	{
		e[u[i]].push_back(v[i]);
		e[v[i]].push_back(u[i]);
	}
	dfs(0,0,0);
	a[0]=1000;
	return a;
}
int find_next_station(int s,int t,vector<int>c)
{
	if(c.size()==1)
		return c[0];
	if(s==1000)
	{
		for(int i=0;i<c.size()-1;i++)
			if(c[i]<=t&&t<c[i+1])
				return c[i];
		return c.back();
	}
	else if(s>c.back())
	{
		for(int i=1;i<c.size()-1;i++)
			if(c[i]<=t&&t<c[i+1])
				return c[i];
		if(c.back()<=t&&t<s)
			return c.back();
		return c[0];
	}
	else
	{
		if(s<t&&t<=c[0])
			return c[0];
		for(int i=1;i<c.size()-1;i++)
			if(c[i-1]<t&&t<=c[i])
				return c[i];
		return c.back();
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:38:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |   for(int i=0;i<c.size()-1;i++)
      |               ~^~~~~~~~~~~
stations.cpp:45:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |   for(int i=1;i<c.size()-1;i++)
      |               ~^~~~~~~~~~~
stations.cpp:56:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |   for(int i=1;i<c.size()-1;i++)
      |               ~^~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61