Submission #531779

#	Time	Username	Problem	Language	Result	Execution time	Memory
531779		EqualTurtle	Stations (IOI20_stations)	C++14	0 / 100	891 ms	668 KiB

stations

#include "stations.h"
#include <vector>
using namespace std;

constexpr int MAXN = 1e3 + 7;
vector <int> graf[MAXN];

int order;
int depth[MAXN];
vector<int> labels;
void dfs(int w)
{
	for (int i : graf[w])
	{
		if (i == 0 || depth[i] > 0)
			continue;
		depth[i] = depth[w] + 1;
		if (depth[i] % 2 == 0)
			labels[i] = order++;
		dfs(i);
		if (depth[i] % 2 == 1)
			labels[i] = order++;
	}
}

vector<int> label(int n, int k, vector<int> u, vector<int> v){
	vector<int> cl(n);
	swap(cl, labels);
	for (int i = 0; i < n; i++){
		graf[u[i]].push_back(v[i]);
		graf[v[i]].push_back(u[i]);
		depth[i] = 0;
	}
	order = 1;
	dfs(0);
	labels[0] = 0;
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	if (c.size() == 1)
		return c[0];

	if (s > c.back())
	{
		if (t > s)
			return c[0];
		
		for (int i = 1; i < c.size(); i++)
		{
			if (c[i] < t && (i == c.size() - 1 || c[i + 1] > t))
				return c[i];
		}

		return c[0];
	}
	else
	{
		if (t > c[c.size() - 2] || t < s)
			return c.back();
		
		for (int i = 0; i < c.size(); i++)
		{
			if (c[i] > t)
				return c[i];
		}

		return c.back();
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:49:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |   for (int i = 1; i < c.size(); i++)
      |                   ~~^~~~~~~~~~
stations.cpp:51:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |    if (c[i] < t && (i == c.size() - 1 || c[i + 1] > t))
      |                     ~~^~~~~~~~~~~~~~~
stations.cpp:62:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |   for (int i = 0; i < c.size(); i++)
      |                   ~~^~~~~~~~~~

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