Submission #432842

#	Time	Username	Problem	Language	Result	Execution time	Memory
432842		charterla	Stations (IOI20_stations)	C++14	100 / 100	898 ms	796 KiB

stations

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

struct Node{
	vector<int> to;
}point[1005];
vector<int> labels;

int num;
void build(int now,int last,int p){
	if(p%2==0)labels[now]=num++;
	
	for(int i=0;i<point[now].to.size();i++){
		int next=point[now].to[i];
		if(next!=last)build(next,now,p+1);
	}
	
	if(p%2==1)labels[now]=num++;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	num=0;labels.clear();labels.resize(n);
	for(int i=0;i<n;i++){point[i].to.clear();}
	
	for(int i=0;i<n-1;i++){
		point[u[i]].to.push_back(v[i]);
		point[v[i]].to.push_back(u[i]);
	}
	
	build(0,-1,0);
	//for(int i=0;i<n;i++)cout<<i<<":"<<labels[i]<<" ";cout<<endl;
	return labels;
}

int find_next_station(int s, int t, vector<int> c){
	if(c.size()==1)return c[0];
	
	if(s>c[0]){
		if(t<=c[0] || t>s)return c[0];
		else return *--upper_bound(c.begin(),c.end(),t);
	}
	else{
		if(t<s || t>=c.back())return c.back();
		else return *lower_bound(c.begin(),c.end(),t);
	}
}

Compilation message (stderr)

stations.cpp: In function 'void build(int, int, int)':
stations.cpp:16:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |  for(int i=0;i<point[now].to.size();i++){
      |              ~^~~~~~~~~~~~~~~~~~~~~

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