Submission #815908

#	Time	Username	Problem	Language	Result	Execution time	Memory
815908		math_rabbit_1028	Stations (IOI20_stations)	C++14	0 / 100	1 ms	336 KiB

stations

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

vector<int> adj[1010];
int ch[1010], ord[2020], lt[2020], rt[2020], dep[2020];

int r = -1;
void DFS(int v) {
	ord[++r] = v;
	lt[v] = r;
	for (int i = 0; i < adj[v].size(); i++) {
		int next = adj[v][i];
		if (ch[next]) continue;
		ch[next] = 1;
		dep[next] = dep[v] + 1;
		DFS(next);
		ord[++r] = v;
	}
	rt[v] = r;
}


vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	for (int i = 0; i < n - 1; i++) {
		adj[u[i]].push_back(v[i]);
		adj[v[i]].push_back(u[i]);
	}

	for (int i = 0; i < n; i++) ch[i] = 0;
	ch[0] = 1; dep[0] = 0;
	DFS(0);

	vector<int> lab(n);
	for (int i = 0; i < n; i++) {
		if (dep[i] % 2 == 0) lab[i] = lt[i];
		else lab[i] = rt[i];
	}

	for (int i = 0; i < n; i++) cout << lab[i] << " ";
	cout << "\n";

	return lab;
}

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

Compilation message (stderr)

stations.cpp: In function 'void DFS(int)':
stations.cpp:12:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |  for (int i = 0; i < adj[v].size(); i++) {
      |                  ~~^~~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:48:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |   for (int i = 0; i < c.size(); i++) {
      |                   ~~^~~~~~~~~~
stations.cpp:56:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |    int l = c[i], r = ((i == c.size() - 1) ? s : c[i + 1]);
      |                        ~~^~~~~~~~~~~~~~~
stations.cpp:61:1: warning: control reaches end of non-void function [-Wreturn-type]
   61 | }
      | ^

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