Cod sursa(job #1418009)

Utilizator alexandrustoicaAlexandru Stoica alexandrustoica Data 11 aprilie 2015 18:37:11
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.41 kb
#include<iostream>
#include<fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");

int a[100001];

int binarysearch0(int low, int high, int x)
{
    int middle;
    while(low<=high)
    {
        middle=low+(high-low)/2;
        if(x<a[middle]) high=middle-1;
        if(x>a[middle]) low=middle+1;
        if(x==a[middle]) return middle;
    }
    return -1;
}

int binarysearch1(int low, int high, int x)
{
    int middle;
    if(x>=high) return high+1;
    while(low<high)
    {
        middle=low+(high-low)/2;
        if(x>=a[middle])
            low=middle+1;
        else
            high=middle;
    }
    middle=low+(high-low)/2;
    if(a[middle]>x)
        middle--;
    return middle+1;
}

int binarysearch2(int low, int high, int x)
{
    int middle;
    while(low<high)
    {
        middle=low+(high-low)/2;
        if(a[middle]<x)
            low=middle+1;
        else
            high=middle;
    }
    middle=low+(high-low)/2;
    if(a[middle]<x)
        middle++;
    return middle;
}

int main()
{
    int n, i, m, type, x;
    f>>n;
    for(i=1; i<=n; i++)
        f>>a[i];
    f>>m;
    while(m!=0)
    {
        f>>type>>x;
        if(type==0) g<<binarysearch0(1, n, x)<<'\n';
        if(type==1) g<<binarysearch1(1, n, x)<<'\n';
        if(type==2) g<<binarysearch2(1, n, x)<<'\n';
        m--;
    }
    return 0;
}