Cod sursa(job #3168517)

Utilizator alegal2100alexandra g alegal2100 Data 12 noiembrie 2023 17:23:27
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.16 kb
#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("cautbin.in");
ofstream fout("cautbin.out");

int a[100001];

int cb0(int st, int dr, int n)
{
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(n>=a[mij])
            st=mij+1;
        else dr=mij-1;
    }
    mij=(st+dr)/2;
    if(a[mij]>n) mij--;
    if(a[mij]==n) return mij;
    return -1;
}

int cb1(int st, int dr, int n)
{
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(n>=a[mij])
            st=mij+1;
        else dr=mij;
    }
    mij=(st+dr)/2;
    if(n<a[mij]) mij--;
    return mij;
}

int cb2(int st, int dr, int n)
{
    int mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(n>a[mij])
            st=mij+1;
            else dr=mij;
    }
    mij=(st+dr)/2;
    if(n>a[mij]) mij++;
    return mij;
}

int main()
{
    int m,n,i, pb, nr;
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>a[i];
    fin>>m;
    for(i=1;i<=m;i++)
    {
        fin>>pb>>nr;
        if(pb==0)
            fout<<cb0(1,n,nr)<<"\n";
        if(pb==1)
            fout<<cb1(1,n,nr)<<"\n";
        if(pb==2)
            fout<<cb2(1,n,nr)<<"\n";
    }
    return 0;
}