Cod sursa(job #2851676)

Utilizator MihaiCostacheCostache Mihai MihaiCostache Data 18 februarie 2022 23:21:15
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.55 kb
#include <fstream>

using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int n, v[100001];

int gasit(int x)
{
    for(int i=1; i<=n; i++)
    {
        if(v[i]==x){return 1;}
    }
    return 0;
}

int cautare(int x)
{
    int st=1;
    int dr=n;
    while(st<=dr)
    {
        int mid=(st+dr)/2;
        if(v[mid]>x)
        {
            dr=mid-1;
        }
        else
        {
            st=mid+1;
        }
    }
    return dr;
}

int caut(int x)
{
    int st=1;
    int dr=n;
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(x>v[mij])
        {
            dr=mij-1;
        }
        else
        {
            return dr-1;
        }
    }
}
int caut2(int x)
{
    int st=1;
    int dr=n;
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(v[mij]<x)
        {
            st=mij+1;
        }
        else
        {
            return st+1;
        }
    }
}
int m, k, x;
int main()
{
    fin>>n;
    for(int i=1; i<=n; i++)
    {
        fin>>v[i];
    }
    fin>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>k>>x;
        if(k==0)
        {
            if(gasit(x)==1)
            {
                fout<<cautare(x)<<"\n";
            }
            else
            {
                fout<<"-1\n";
            }
        }
        else if(k==1)
        {
            fout<<caut(x)<<"\n";
        }
        else if(k==2)
        {
            fout<<caut2(x)<<"\n";
        }
    }
    return 0;
}