Cod sursa(job #1423735)

Utilizator mantisVraciu Stefan mantis Data 22 aprilie 2015 14:41:48
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.14 kb
#include<fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int tip,val,m,n,a[100005];
int cautbin0(int st, int dr, int x)
{
    int m;
    while(st<=dr)
    {
        m=(st+dr)/2;
        if(a[m]>x) dr=m-1;
        else st=m+1;
    }
    m=(st+dr)/2;
    if(a[m]>x) m--;
    if(a[m]==x) return m;
    return -1;
}
int cautbin1(int st, int dr, int x)
{
    int m;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(a[m]<=x) st=m+1;
        else dr=m;
    }
    m=(st+dr)/2;
    if(a[m]>x) m--;
    return m;
}
int cautbin2(int st, int dr, int x)
{
    int m;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(a[m]>=x) dr=m;
        else st=m+1;
    }
    m=(st+dr)/2;
    if(a[m]<x) m++;
    return m;
}
int main()
{
    f>>n;
    for(int i=1;i<=n;i++)
        f>>a[i];
    f>>m;
    while(m--)
    {
        f>>tip>>val;
        switch(tip)
        {
            case 0: g<<cautbin0(1,n,val)<<'\n'; break;
            case 1: g<<cautbin1(1,n,val)<<'\n'; break;
            case 2: g<<cautbin2(1,n,val)<<'\n'; break;
        }
    }
    g.close();
    return 0;
}