Cod sursa(job #1853609)

Utilizator TherevengerkingSurani Adrian Therevengerking Data 21 ianuarie 2017 21:34:42
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.21 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
const int Nmax=100000+5;
int a[Nmax];
int n,m;
int cautbin0(int key,int p,int u)
{
    int m;
    while(p<=u)
    {
        m=p+(u-p)/2;
        if(a[m]<=key)p=m+1;
        else u=m-1;
    }
    m=p+(u-p)/2;
    if(a[m]>key)
        m--;
    if(a[m]==key)return m;
    return -1;
}
int cautbin1(int key,int p,int u)
{
    int m;
    while(p<u)
    {
        m=p+(u-p)/2;
        if(a[m]<=key)p=m+1;
        else u=m-1;
    }
    m=p+(u-p)/2;
    if(a[m]>key)
        m--;
    return m;
}
int cautbin2(int key,int p,int u)
{
    int m;
    while(p<u)
    {
        m=p+(u-p)/2;
        if(a[m]<key)p=m+1;
        else u=m-1;
    }
    m=p+(u-p)/2;
    if(a[m]<key)
        m--;
    return m;
}
int main()
{
    int x,y;
    fin>>n;
    for(int i=1;i<=n;++i)fin>>a[i];
    fin>>m;
    for(int i=1;i<=m;++i)
    {
        fin>>x>>y;
        if(x==0)
        fout<<cautbin0(y,1,n)<<'\n';
        else
        {
            if(x==1)
                fout<<cautbin1(y,1,n)<<'\n';
            else fout<<cautbin2(y,1,n)<<'\n';
        }
    }
    return 0;
}