Cod sursa(job #2111370)

Utilizator BogdanGhGhinea Bogdan BogdanGh Data 21 ianuarie 2018 22:31:37
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.27 kb
#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
int st,dr,mij,a[100001],x,y,i,n,nr,m;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int citire()
{
    f>>n;
    for(i=1;i<=n;i++)
        f>>a[i];
}
int cbinara0(int x)
{
    int st=1;
    int dr=n,mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(x>=a[mij])st=mij+1;
        else dr=mij-1;
    }
    mij=(st+dr)/2;
    if(a[mij]>x)mij--;
    if(a[mij]==x)return mij;
    else return -1;}
int cbinara1(int x)
{
    int st=1;
    int dr=n,mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(x>=a[mij])st=mij+1;
        else dr=mij-1;
    }
    mij=(st+dr)/2;
    if(a[mij]>x)mij--;
    if(a[mij]<=x)return mij;
}
int cbinara2(int x)
{
    int st=1;
    int dr=n,mij;
    while(st<dr)
    {
        mij=(st+dr)/2;
        if(x>a[mij])st=mij+1;
        else dr=mij-1;
    }
    mij=(st+dr)/2;
    if(a[mij]<x)mij++;
    return mij;
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
        f>>a[i];
    sort(a+1,a+n+1);
    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>nr>>x;
        if(nr==0)g<<cbinara0(x)<<"\n";
        else if(nr==1)g<<cbinara1(x)<<"\n";
        else if(nr==2)g<<cbinara2(x)<<"\n";
    }
    return 0;
}