Submission #780765

#	Time	Username	Problem	Language	Result	Execution time	Memory
780765		Josia	Stations (IOI20_stations)	C++17	0 / 100	800 ms	672 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>

using namespace std;




vector<int> pre;
vector<vector<int>> graph;

int tim;
void dfs(int v) {
	if (pre[v] != -1) return;
	pre[v] = tim++;
	for (int i: graph[v]) {
		dfs(i);
	}
}


vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	tim = 0;
	vector<int> labels(n);
	pre.assign(n, -1);
	graph.clear(); graph.resize(n);

	for (int i = 0; i<n-1; i++) {
		graph[u[i]].push_back(v[i]);
		graph[v[i]].push_back(u[i]);
	}

	dfs(0);

	// for (int i: pre) cerr << i << " ";
	// cerr << "\n";

	return pre;
}

int find_next_station(int s, int t, vector<int> c) {

	sort(c.begin(), c.end());

	if (t < s) return c[0];

	reverse(c.begin(), c.end());

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

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:49:19: 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 = 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