Submission #305000

#	Time	Username	Problem	Language	Result	Execution time	Memory
305000		Pajaraja	Stations (IOI20_stations)	C++17	100 / 100	1228 ms	1280 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
#define MAXN 1007
using namespace std;
static int lb[MAXN],t;
static vector<int> g[MAXN];
void dfs(int s,int f,int d)
{
    if(!d) lb[s]=t++;
    for(int i=0;i<g[s].size();i++) if(g[s][i]!=f) dfs(g[s][i],s,d^1);
    if(d) lb[s]=t++;
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	for(int i=0;i<n-1;i++) g[u[i]].push_back(v[i]);
	for(int i=0;i<n-1;i++) g[v[i]].push_back(u[i]);
	dfs(0,0,0); t=0;
	for(int i=0;i<n;i++) g[i].clear();
	std::vector<int> labels(n);
	for (int i = 0; i < n; i++) labels[i] = lb[i];
	return labels;
}
int find_next_station(int s, int t, std::vector<int> c)
{
    if(s<c[0])
    {
        sort(c.begin(),c.end());
        vector<int> aux;
        for(int i=0;i+1<c.size();i++) aux.push_back(c[i]);
        if(c.size()==1) return c[0];
		if(s==0) aux.push_back(c[c.size()-1]);
        if(t>s && t<=aux[0]) return aux[0];
        for(int i=1;i<aux.size();i++) if(t>aux[i-1] && t<=aux[i]) return aux[i];
        return c[c.size()-1];
    }
    else
    {
        sort(c.begin(),c.end());
        vector<int> aux;
        if(c.size()==1) return c[0];
        for(int i=1;i<c.size();i++) aux.push_back(c[i]);
        for(int i=0;i+1<aux.size();i++) if(t>=aux[i] && t<aux[i+1]) return aux[i];
        if(t<s && t>=aux[aux.size()-1]) return aux[aux.size()-1];
        return c[0];
    }
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int, int, int)':
stations.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<g[s].size();i++) if(g[s][i]!=f) dfs(g[s][i],s,d^1);
      |                 ~^~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:28:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         for(int i=0;i+1<c.size();i++) aux.push_back(c[i]);
      |                     ~~~^~~~~~~~~
stations.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         for(int i=1;i<aux.size();i++) if(t>aux[i-1] && t<=aux[i]) return aux[i];
      |                     ~^~~~~~~~~~~
stations.cpp:40:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for(int i=1;i<c.size();i++) aux.push_back(c[i]);
      |                     ~^~~~~~~~~
stations.cpp:41:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         for(int i=0;i+1<aux.size();i++) if(t>=aux[i] && t<aux[i+1]) return aux[i];
      |                     ~~~^~~~~~~~~~~

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