Cod sursa(job #2338128)

Utilizator DBogdan23Dumitru Bogdan Mihai DBogdan23 Data 7 februarie 2019 02:15:13
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.36 kb
#include <bits/stdc++.h>
using namespace std;
ifstream in("cautbin.in");
ofstream out("cautbin.out");
long long v[100001];
int bin_0(int x, int st, int dr)
{
    int mij,poz=-1;
    while(st<=dr)
    {
        mij=(dr+st)/2;
        if(v[mij]==x)
        {
            poz=mij;
            st=mij+1;
        }
        else if(v[mij]<x)
            st=mij+1;
        else dr=mij-1;
    }
    return poz;

}
int bin_1(int x, int st, int dr)
{
    if(x<v[1])
        return 1;
    if(x>=v[dr])
        return dr;
    int mij,poz;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(v[mij] <= x)
        {
            poz=mij;
            st=mij+1;
        }
        else
            dr=mij-1;
    }
    return poz;
}
int bin_2(int x,int st, int dr)
{
    if(x<=v[1])
        return 1;
    int mij,poz;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(x<=v[mij])
        {
            poz=mij;
            dr=mij-1;
        }
        else st=mij+1;
    }
    return poz;
}
int main()
{
    int n,i,m,a,b;
    in>>n;
    for(i=1; i<=n; i++)
        in>>v[i];
    in>>m;
    for(i=1; i<=m; i++)
    {
        in>>a>>b;
        if(a==0)
            out<<bin_0(b,1,n)<<'\n';
        else if(a==1)
            out<<bin_1(b,1,n)<<'\n';
        else
            out<<bin_2(b,1,n)<<'\n';
    }
    return 0;
}