Submission #680843

#	Time	Username	Problem	Language	Result	Execution time	Memory
680843		aryan12	Stations (IOI20_stations)	C++17	52.32 / 100	929 ms	792 KiB

stations

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

const int N = 1001;
int tin[N], tout[N];
int tim = -1;
vector<int> g[N];

void dfs(int node, int par)
{
	tin[node] = ++tim;
	for(int to: g[node])
	{
		if(to == par) continue;
		dfs(to, node);
	}
	tout[node] = tim;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	tim = -1;
	for(int i = 0; i < N; i++)
	{
		g[i].clear();
	}
	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);
	vector<int> labels;
	// cout << "in label\n";
	for(int i = 0; i < n; i++)
	{
		// cout << tin[i] << " " << tout[i] << "\n";
		// cout << "label assigned: " << tout[i] * 1000 + tin[i] << "\n";
		labels.push_back(tout[i] * 1000 + tin[i]);
	}
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
	// cout << "find_next_station(" << s << ", " << t << ")\n";
	int min_tim_in = 1e9, min_tim_pos = 0;
	int t_out = t / 1000, t_in = t % 1000;
	int s_out = s / 1000, s_in = s % 1000;
	for(int i = 0; i < c.size(); i++)
	{
		int time_out = c[i] / 1000, time_in = c[i] % 1000;
		if(time_in <= t_in && t_out <= time_out && time_in > s_in)
		{
			return c[i];
		}
		if(time_in < min_tim_in)
		{
			min_tim_in = time_in;
			min_tim_pos = i;
		}
	}
	return c[min_tim_pos];
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:28:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |  for(int i = 0; i < u.size(); i++)
      |                 ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:50:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |  for(int i = 0; i < c.size(); i++)
      |                 ~~^~~~~~~~~~
stations.cpp:49:6: warning: unused variable 's_out' [-Wunused-variable]
   49 |  int s_out = s / 1000, s_in = s % 1000;
      |      ^~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.3205 / 61