Cod sursa(job #1626260)

Utilizator eusebiu_gageaGagea Eusebiu-Andrei eusebiu_gagea Data 3 martie 2016 00:04:02
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.23 kb
#include <fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");

int n,m,a[100001];

int caut_bin_0(int st, int dr, int k)
{
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)>>1;
        if(a[mij]>=k)
            st=mij+1;
        else
            dr=mij-1;
    }
    if(a[mij-1]==k)
        return mij-1;
    return -1;
}

int caut_bin_1(int st, int dr, int k)
{
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)>>1;
        if(a[mij]<=k)
            st=mij+1;
        else
            dr=mij-1;
    }
    if(a[mij-1]==k)
        return mij-1;
    return -1;
}

int caut_bin_2(int st, int dr, int k)
{
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)>>1;
        if(a[mij]>=k)
            dr=mij-1;
        else
            st=mij+1;
    }
    if(a[mij]==k)
        return mij;
    return -1;
}

int main()
{
    int i,x,val;
    f>>n;
    for(i=1; i<=n; i++)
        f>>a[i];
    f>>m;
    for(i=1; i<=m; i++)
    {
        f>>x>>val;
        if(x==0)
            g<<caut_bin_0(1,n,val)<<'\n';
        else if(x==1)
            g<<caut_bin_1(1,n,val)<<'\n';
        else
            g<<caut_bin_2(1,n,val)<<'\n';
    }
    return 0;
}