Cod sursa(job #1051233)

Utilizator MarcusPopMarcus Pop MarcusPop Data 9 decembrie 2013 20:55:44
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.26 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int v[100005];
int intr0(int n,int x)
{
    int st=1,dr=n,m;
    while(st<dr)
    {
        m=(dr+st)/2;
        if(x>=v[m])
            st=m+1;
        else
            dr=m-1;
    }
    m=(st+dr)/2;
    if(v[m]>x)
        --m;
    if(v[m]==x)
        return m;
    else
        return -1;
}
int intr1(int n,int x)
{
    int st=1,dr=n,m;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(x>=v[m])
            st=m+1;
        else
            dr=m-1;
    }
    m=(st+dr)/2;
    if(v[m]>x)
        --m;
    if(x>=v[m])
        return m;
}
int intr2(int n,int x)
{
    int st=1,dr=n,m;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(x>=v[m])
            st=m+1;
        else
            dr=m-1;
    }
    m=(st+dr)/2;
    if(v[m]>x)
        ++m;
    return m-1;
}
int main()
{
    int n,x,tip,M;
    f>>n;
    for(int i=1;i<=n;i++)
        f>>v[i];
    f>>M;
    for(int j=1;j<=M;++j)
    {
        f>>tip>>x;
        if(tip==0)
            g<<intr0(n,x)<<'\n';
        if(tip==1)
            g<<intr1(n,x)<<'\n';
        if(tip==2)
            g<<intr2(n,x)<<'\n';
    }
    return 0;
}