Cod sursa(job #1942989)

Utilizator lupulescu2001Lupulescu Vlad lupulescu2001 Data 28 martie 2017 12:15:05
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.28 kb
#include<fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int a[100003],n;
int cautbin1(int value)
{
    int l=1,r=n,mid,sol=-1;

    while(l<=r)
    {
        mid=(l+r)/2;
        if(a[mid]<value)
            l=mid+1;
        else if(a[mid]>value)
            r=mid-1;
        else
        {
            sol=mid;
            l=mid+1;
        }
    }
    return sol;
}
int cautbin2(int value)
{
    int l=1,r=n,mid,i,sol;
    while(l<=r)
    {
        mid=(l+r)/2;
        if(a[mid]<=value)
        {
            sol=mid;
            l=mid+1;
        }

        else
            r=mid-1;

    }
    return sol;
}
int cautbin3(int value)
{
    int l=1,r=n,mid,i,sol;
    mid=(1+n)/2;
    while(l<=r)
    {
        if(a[mid]>=value)
        {
            sol=mid;
            r=mid-1;
        }
        else
            l=mid+1;
        mid=(l+r)/2;
    }
    return sol;
}
int main()
{
    int i,m,x,p;
    fin>>n;
    for(i=1; i<=n; i++)
        fin>>a[i];
    fin>>m;
    for(i=1; i<=m; i++)
    {
        fin>>p>>x;
        if(p==0)
            fout<<cautbin1(x)<<'\n';
        else if(p==1)
            fout<<cautbin2(x)<<'\n';
        else
            fout<<cautbin3(x)<<'\n';
    }

}