Submission #795885

#	Time	Username	Problem	Language	Result	Execution time	Memory
795885		BT21tata	Stations (IOI20_stations)	C++17	100 / 100	780 ms	848 KiB

stations

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

int cur;
vector<int> g[1005], labels;

void dfs(int v, int p, int x)
{
	if(!x) labels[v]=cur++;
	for(int u : g[v])
	{
		if(u==p) continue;
		dfs(u, v, x^1);
	}
	if(x) labels[v]=cur++;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v)
{
	labels.resize(n, 0);
	for(int i=0; i<n; i++)
		g[i].clear();
	cur=0;
	for(int i=0; i<u.size(); i++)
	{
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	dfs(0, -1, 0);
	/*for(int u :labels)
		cout<<u<<' ';
	cout<<flush;*/
	return labels;
}

int find_next_station(int s, int t, vector<int> c)
{
	sort(c.begin(), c.end());
	if(s<c[0])
	{
		int fs=s;
		for(int i=0; i<c.size()-1; i++)
		{
			if(fs<=t and t<=c[i]) return c[i];
			fs=c[i]+1;
		}
		return c.back();
	}
	else
	{
		int last=s;
		for(int i=c.size()-1; i>0; i--)
		{
			if(c[i]<=t and t<=last) return c[i];
			last=c[i]-1;
		}
		return c[0];
	}
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:25:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |  for(int i=0; i<u.size(); i++)
      |               ~^~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:43:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |   for(int i=0; i<c.size()-1; i++)
      |                ~^~~~~~~~~~~

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