Submission #593038

#	Time	Username	Problem	Language	Result	Execution time	Memory
593038		Morisz10	Stations (IOI20_stations)	C++14	0 / 100	5 ms	804 KiB

stations

#include "stations.h"
#include <vector>
#include <algorithm>
#include <iostream>
#include <cassert>
#include <map>
#include <cstdio>
using namespace std;

const int maxn = 1000;
vector<int> g[maxn];
int l;
vector<int> L, max_L, r_label;
int dfs(int x, int p) {
	max_L[x] = L[x] = l++;
	//cout << x << ' ' << l << '\n';
	r_label[L[x]] = x;
	for (int i : g[x]) {
		if (i != p)max_L[x] = dfs(i, x);
	}
	return max_L[x];
}

vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	L.assign(n, 0);
	for (int i = 0; i < n; i++)g[i] = {};
	max_L.assign(n, 0);
	r_label.assign(n, 0);
	for (int i = 0; i < u.size(); i++) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	l = 0;
	dfs(0, -1);
	return L;
}

int find_next_station(int s, int t, std::vector<int> c) {
	for (int i = 0; i < c.size() - 1; i++) {
		if (t < c[i + 1])return c[i];
	}
	return t > max_L[r_label[c.back()]] ? c[0] : c.back();
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  for (int i = 0; i < u.size(); i++) {
      |                  ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:39:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |  for (int i = 0; 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