Submission #1072157

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072157		hasan2006	Stations (IOI20_stations)	C++17	100 / 100	666 ms	1408 KiB

stations

#include <bits/stdc++.h>
#include "stations.h"
#include <vector>
 
using namespace std;
 
const int maxn = 1e3+10;
 
static int st[maxn], en[maxn], nivel[maxn], tt;
 
vector<int> grafo[maxn];
 
void dfs(int u, int p){
	st[u] = ++tt;
	for (auto v: grafo[u]){
		if (v == p) continue;
		nivel[v] = nivel[u]+1; 
		dfs(v, u);
	}
	en[u] = ++tt;
}
 
vector<int> label(int n, int k, vector<int> u, vector<int> v){
	tt = -1;
	for (int i = 0; i < n; i++)
		grafo[i].clear();
	for (int i = 0; i < n-1; i++){
		grafo[u[i]].push_back(v[i]);
		grafo[v[i]].push_back(u[i]);
	}
	dfs(0, -1);
	vector<int> num;
	for (int i = 0; i < n; i++){
		if (nivel[i]%2 == 0) num.push_back(st[i]);
		else num.push_back(en[i]);
	}
	map<int, int> mp;
	for (auto x: num)
		mp[x] = 0;
	int aux = 0;
	for (auto &x: mp)
		x.second = ++aux;
	for (auto &x: num)
		x = mp[x];
	return num;
}
 
int find_next_station(int u, int v, vector<int> c){
	if (c.size() == 1) return c[0];
	bool flag = 0;
	for (auto x: c)
		if (u < x)
			flag = 1;
	if (!flag){
		for (int i = 1; i < c.size()-1; i++){
			st[i] = c[i];
			en[i] = c[i+1]-1;
		}
 
		st[c.size()-1] = c[c.size()-1];
		en[c.size()-1] = u;
 
		for (int i = 1; i < c.size(); i++)
			if (v >= st[i] && v <= en[i])
				return c[i];
 
		return c[0];
	}else{
		st[0] = u+1;
		en[0] = c[0];
		for (int i = 1; i < c.size()-1; i++){
            en[i] = c[i];
			st[i] = en[i-1]+1;
		}
 
		for (int i = 0; i < c.size()-1; i++)
			if (v >= st[i] && v <= en[i])
				return c[i];
 
		return c[c.size()-1];
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:55:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |   for (int i = 1; i < c.size()-1; i++){
      |                   ~~^~~~~~~~~~~~
stations.cpp:63:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |   for (int i = 1; i < c.size(); i++)
      |                   ~~^~~~~~~~~~
stations.cpp:71:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |   for (int i = 1; i < c.size()-1; i++){
      |                   ~~^~~~~~~~~~~~
stations.cpp:76:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |   for (int i = 0; i < c.size()-1; i++)
      |                   ~~^~~~~~~~~~~~

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