Submission #871420

#	Time	Username	Problem	Language	Result	Execution time	Memory
871420		andrei_boaca	Stations (IOI20_stations)	C++17	100 / 100	564 ms	1820 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
#include <vector>
//#include "stub.cpp"
using namespace std;
const int baza=1e8;
vector<int> muchii[1005];
int in[1005],out[1005],timp,niv[1005];
bool use[1005];
int n,k;
vector<int> L;
int ch,ind;
int lin[10005];
void dfs(int nod)
{
    timp++;
    lin[timp]=nod;
    in[nod]=timp;
    use[nod]=1;
    for(int i:muchii[nod])
        if(!use[i])
        {
            niv[i]=niv[nod]+1;
            dfs(i);
        }
    timp++;
    lin[timp]=nod;
    out[nod]=timp;
}
std::vector<int> label(int N, int K, std::vector<int> u, std::vector<int> v)
{
    n=N;
    k=K;
    L.clear();
    L.resize(n);
    timp=0;
    for(int i=0;i<n;i++)
    {
        use[i]=0;
        muchii[i].clear();
    }
    for(int i=0;i<u.size();i++)
    {
        int a=u[i];
        int b=v[i];
        muchii[a].push_back(b);
        muchii[b].push_back(a);
    }
    niv[0]=1;
    dfs(0);
    vector<int> ord;
    for(int i=1;i<=timp;i++)
    {
        int nod=lin[i];
        if(niv[nod]%2==1)
        {
            if(in[nod]==i)
                ord.push_back(nod);
        }
        if(niv[nod]%2==0)
        {
            if(out[nod]==i)
                ord.push_back(nod);
        }
    }
    for(int i=0;i<ord.size();i++)
        L[ord[i]]=i;
    return L;
}

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

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:42:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(int i=0;i<u.size();i++)
      |                 ~^~~~~~~~~
stations.cpp:66:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for(int i=0;i<ord.size();i++)
      |                 ~^~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:77:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |         for(int i=0;i+1<c.size();i++)
      |                     ~~~^~~~~~~~~

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