Submission #321930

#	Time	Username	Problem	Language	Result	Execution time	Memory
321930		demetre	Stations (IOI20_stations)	C++14	100 / 100	1097 ms	1248 KiB

stations

#include "stations.h"
#include<bits/stdc++.h>

using namespace std;

int fix[1005],timer;
vector<int> V[1005],labels;

void dfs(int u,int d){
	fix[u]=1;
	if(d%2==0) timer++,labels[u]=timer;
	for(int i=0;i<V[u].size();i++){
		if(!fix[V[u][i]]){
			dfs(V[u][i],d+1);
		}
	}
	if(d%2!=0){
		timer++;
		labels[u]=timer;
	}
}
 
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	labels.clear();
	labels.resize(n);
	for(int i=0;i<n;i++){
		V[i].clear();
		fix[i]=0;
	}
	for (int i = 0; i < u.size(); i++) {
		V[u[i]].push_back(v[i]);
		V[v[i]].push_back(u[i]);
	} 
	timer=0;
	for(int i=0;i<n;i++){
		if(fix[i]==0)
			dfs(i,0);
	}
	return labels;
}
 
int find_next_station(int s, int t, std::vector<int> c) {
	if(s<c[0]) {
	    if(t>s){	
			for(int i=0;i<c.size()-1;i++){
				if(t<=c[i]) return c[i];
			}
		}
		return c[c.size()-1];			
	}
	else {
		if(t<s){
			for(int i=c.size()-1;i>=1;i--)
			if(t>=c[i]) return c[i];
		}
		return c[0];
	}
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int, int)':
stations.cpp:12:15: 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<V[u].size();i++){
      |              ~^~~~~~~~~~~~
stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:30:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |  for (int i = 0; i < u.size(); i++) {
      |                  ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:45:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |    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