Cod sursa(job #1961105)

Utilizator ana-maria.simiAna-Maria Simionescu ana-maria.simi Data 10 aprilie 2017 21:28:45
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.59 kb
#include <algorithm>
#include <fstream>
#include <iostream>
using namespace std;
int n,m,a[100001],i,t,x,sol;

int cautbin0(int p, int u, int k)
{   int mij;
    while(p<=u)
    {
        mij=(p+u)/2;
        if(a[mij]<=k)
        {
            p=mij+1;
        }
        else
        {
            u=mij-1;
        }
    }
    mij=(p+u)/2;
    if(k>a[mij])
        mij--;
    if(a[mij]==k)
        return mij;
    return -1;
}

int cautbin1(int p, int u, int k)
{   int mij;
    while(p<u)
    {
        mij=(p+u)/2;
        if(a[mij]<=k)
        {
            p=mij+1;
        }
        else
            u=mij;
    }
    mij=(u+p)/2;
    if(a[mij]>k)
        mij--;
    return mij;
}

int cautbin2(int p, int u, int k)
{
    int mij;
    while(p<u)
    {
        mij=(p+u)/2;
        if(a[mij]<k)
        {
            p=mij+1;
        }
        else
            u=mij;
    }
    mij=(u+p)/2;
    if(a[mij]<k)
        mij++;
    return mij;
}

int main()
{
    freopen("cautbin.in", "r", stdin);
    freopen("cautbin.out", "w", stdout);
    scanf("%d", &n);
    for(i=1; i<=n; i++)
        scanf("%d", &a[i]);
    sort(a+1,a+n+1);
    scanf("%d", &m);
    for(i=1; i<=m; i++)
    {
        scanf("%d%d", &t, &x);
        if(t==0)
        {
           printf("%d\n", cautbin0(1,n,x));
        }
            else
                if(t==1)
                    printf("%d\n", cautbin1(1,n,x));
                    else
                        if(t==2)
                            printf("%d\n", cautbin2(1,n,x));

    }

    return 0;
}