Cod sursa(job #1712962)

Utilizator Fanika123Tanasa Stefan Fanika123 Data 4 iunie 2016 13:19:43
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.32 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int n,a[100005],m;
int CautBin0(int st, int dr, int x)
{
    int mj,p;
    if (x<a[st]) return -1;
    if (x>a[dr]) return -1;
    p=-1;
    while(st<=dr)
    {
        mj=(st+dr)/2;
        if (x==a[mj])
        {
            p=mj;
            st=mj+1;
        }
        else if (x<a[mj]) dr=mj-1;
             else st=mj+1;
    }
    return p;
}

int CautBin1(int st, int dr, int x)
{
    int mj,p;
    p=-1;
    while(st<=dr)
    {
        mj=(st+dr)/2;
        if (a[mj]<=x)
        {
            p=mj;
            st=mj+1;
        }
        else dr=mj-1;
    }
    return p;
}

int CautBin2(int st, int dr, int x)
{
    int mj,p;
    p=-1;
    while(st<=dr)
    {
        mj=(st+dr)/2;
        if (a[mj]>=x)
        {
            p=mj;
            dr=mj-1;
        }
        else st=mj+1;
    }
    return p;
}

int main()
{
    int i,val,x;
    fin>>n;
    for (i=1;i<=n;i++)
        fin>>a[i];
    fin>>m;
    for (i=1;i<=m;i++)
    {
        fin>>val>>x;
        if (val==0) fout<<CautBin0(1,n,x)<<"\n";
        else if (val==1) fout<<CautBin1(1,n,x)<<"\n";
             else fout<<CautBin2(1,n,x)<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}