Cod sursa(job #2668285)

Utilizator raduk11Serban Mihai-Radu raduk11 Data 4 noiembrie 2020 18:51:31
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <iostream>
#include <fstream>
using namespace std;

ifstream f("cautbin.in");
ofstream g("cautbin.out");

const int nmax=100000;
int n,v[nmax+1];

int caut0(int x)
{
    int p=1,u=n,poz=-1;
    while(p<=u)
    {
        int m=(p+u)/2;
        if(x==v[m])
        {
            poz=m;
            p=m+1;
        }
        else
            if(x>v[m])p=m+1;
            else u=m-1;
    }
    return poz;
}

int caut1(int x)
{
    int p=1,u=n,poz=-1;
    while(p<=u)
    {
        int m=(p+u)/2;
        if(x>=v[m])
        {
            poz=m;
            p=m+1;
        }
        else
            u=m-1;
    }
    return poz;
}
int caut2(int x)
{
    int p=1,u=n,poz=-1;
    while(p<=u)
    {
        int m=(p+u)/2;
        if(x<=v[m])
        {
            poz=m;
            u=m-1;
        }
        else
            p=m+1;
    }
    return poz;
}
int main()
{
    int m,x,l,t;
    f>>n;
    for(int i=1; i<=n; i++)
        f>>v[i];
    f>>m;
    while(m--)
    {
        f>>t>>x;
        switch(t)
        {
        case 0:
            g<<caut0(x)<<'\n';
            break;
        case 1:
            g<<caut1(x)<<'\n';
            break;
        //default:
        case 2:
            g<<caut2(x)<<'\n';
            //break;
        }
    }
    return 0;
}