Cod sursa(job #2074911)

Utilizator SoranaAureliaCatrina Sorana SoranaAurelia Data 25 noiembrie 2017 09:43:36
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.59 kb
#include <cstdio>
using namespace std;

int n, m;
int a[100001];

int cautbin0(int x, int n)
{
    int poz=0, mij, st=1, dr=n;
    for(int st=1, dr=n; st<=dr; )
    {
        int mij=(st+dr)/2;
        if(a[mij]<=x)
        {
            if(a[mij]==x)
                poz=mij;
            st=mij+1;
        }
        else
            dr=mij-1;
    }
    if(poz!=0)
        return poz;
    return -1;
}

int cautbin1(int x, int n)
{
    int poz=0, mij, st=1, dr=n;
    for(int st=1, dr=n; st<=dr; )
    {
        int mij=(st+dr)/2;
        if(a[mij]<=x)
        {
            poz=mij;
            st=mij+1;
        }
        else
        {
            dr=mij-1;
        }

    }
    if(poz!=0)
        return poz;
    return -1;
}

int cautbin2(int x, int n)
{
    int poz=0, mij, st=1, dr=n;
    for(int st=1, dr=n; st<=dr; )
    {
        int mij=(st+dr)/2;
        if(a[mij]>=x)
        {
            poz=mij;
            dr=mij-1;
        }
        else if(a[mij]<x)
            st=mij+1;

    }
    if(poz!=0)
        return poz;
    return -1;
}
int main()
{
    freopen("cautbin.in", "r", stdin);
    freopen("cautbin.out", "w", stdout);
    scanf("%d", &n);
    for(int i=1; i<=n; i++)
        scanf("%d", &a[i]);
    scanf("%d", &m);
    int cer, x;
    for(int i=1; i<=m; i++)
    {
        scanf("%d %d\n",&cer, &x);
        if(cer==0)
            printf("%d\n", cautbin0(x, n));
        else if(cer==1)
            printf("%d\n", cautbin1(x, n));
        else
            printf("%d\n", cautbin2(x, n));
    }
    return 0;
}