Submission #432749

#	Time	Username	Problem	Language	Result	Execution time	Memory
432749		charterla	Stations (IOI20_stations)	C++14	5 / 100	867 ms	780 KiB

stations

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

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

int num;
void build(int now,int last,int p){
	//cout<<now<<"<-"<<last<<":"<<p<<endl;
	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();
		point[i].deg=0;
	}
	
	int root=0;
	for(int i=0;i<n-1;i++){
		point[u[i]].to.push_back(v[i]);
		point[u[i]].deg++;
		if(point[u[i]].deg>point[root].deg)root=u[i];
		
		point[v[i]].to.push_back(u[i]);
		point[v[i]].deg++;
		if(point[v[i]].deg>point[root].deg)root=v[i];
	}
	
	build(root,-1,0);
	//for(int i=0;i<n;i++)cout<<labels[i]<<" ";cout<<endl;
	return labels;
}

int find_next_station(int s, int t, vector<int> c){
	if(c.size()==1)return c[0];
	
	bool way=true;
	for(int i=0;i<c.size();i++){
		if(s<c[i]){
			way=false;
			break;
		}
	}
	
	int ls=-1,rs=-1;
	if(way){
		sort(c.begin(),c.end());
		
		ls=c[1];rs=s;
		if(t<ls || t>rs)return c[0];
		
		for(int i=1;i<c.size();i++){
			ls=c[i];rs=(i==c.size()-1?s-1:c[i+1]-1);
			if(ls<=t && t<=rs)return c[i];
		}
	}
	else{
		sort(c.rbegin(),c.rend());
		
		ls=s;rs=c[1];
		if(t<ls || t>rs)return c[0];
		
		for(int i=1;i<c.size();i++){
			ls=(i==1?s+1:c[i-1]+1);rs=c[i];
			if(ls<=t && t<=rs)return c[i];
		}
	}
}
/*
1 5 10 0 1 1 2 1 3 2 4
*/

Compilation message (stderr)

stations.cpp: In function 'void build(int, int, int)':
stations.cpp:18:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |  for(int i=0;i<point[now].to.size();i++){
      |              ~^~~~~~~~~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:54:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |  for(int i=0;i<c.size();i++){
      |              ~^~~~~~~~~
stations.cpp:68:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |   for(int i=1;i<c.size();i++){
      |               ~^~~~~~~~~
stations.cpp:69:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |    ls=c[i];rs=(i==c.size()-1?s-1:c[i+1]-1);
      |                ~^~~~~~~~~~~~
stations.cpp:79:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |   for(int i=1;i<c.size();i++){
      |               ~^~~~~~~~~
stations.cpp:84:1: warning: control reaches end of non-void function [-Wreturn-type]
   84 | }
      | ^

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