Submission #926801

#	Time	Username	Problem	Language	Result	Execution time	Memory
926801		velislavgarkov	Stations (IOI20_stations)	C++14	100 / 100	523 ms	1480 KiB

stations

#include "stations.h"
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
const int MAXN=1e3+10;
struct Number {
	int x;
	int ind;
	bool friend operator < (Number a, Number b) {
		return a.x<b.x;
	}
};
Number num[MAXN];
vector <int> ver[MAXN];
vector <int> ans;
int in[MAXN], out[MAXN], dep[MAXN];
int br;
void dfs(int x, int par) {
	in[x]=br;
	br++;
	for (auto i:ver[x]) {
		if (i==par) continue;
		dep[i]=dep[x]+1;
		dfs(i,x);
	}
	out[x]=br;
	br++;
	if (dep[x]%2==0) num[x].x=in[x];
	else num[x].x=out[x];
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	for (int i=0;i<n;i++) {
		if (!ver[i].empty()) ver[i].clear();
		num[i].ind=i;
	}
	for (int i=0;i<n-1;i++) {
		ver[u[i]].push_back(v[i]);
		ver[v[i]].push_back(u[i]);
	}
	dep[0]=br=0;
	dfs(0,-1);
	sort(num,num+n);
	ans.resize(n);
	for (int i=0;i<n;i++) ans[num[i].ind]=i;
	return ans;
}

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

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:51:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |   for (int i=0;i<c.size();i++) {
      |                ~^~~~~~~~~
stations.cpp:57:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |   for (int i=0;i<c.size()-1;i++) {
      |                ~^~~~~~~~~~~
stations.cpp:64:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |   for (int i=1;i<c.size();i++) {
      |                ~^~~~~~~~~

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