Cod sursa(job #1596636)

Utilizator valorosu_300Cristian Gherman valorosu_300 Data 11 februarie 2016 11:19:02
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.1 kb
#include <fstream>
using namespace std;
ifstream in("cautbin.in");
ofstream out("cautbin.out");
const int nmax=100002;
int v[nmax];
int cautbin0(int x,int &n)//0
{
    int st=1,dr=n,mij;
    while(st<=dr)
        {
            mij=(st+dr)/2;
            if(v[mij]==x)st=mij+1;
            else dr=mij-1;
        }
    if(v[dr]==x) return dr;
    else return -1;
}
int cautbin1(int x,int &n)//1
{
    int st=1,dr=n,mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(v[mij]<=x)st=mij+1;
        else dr=mij-1;
    }
    return dr;
}
int cautbin2(int x,int &n)//2
{
    int st=1,dr=n,mij;
    while(st<=dr)
        {
            mij=(st+dr)/2;
            if(v[mij]>=x)dr=mij-1;
            else st=mij+1;
        }
    return mij;
}
int main()
{
    ios_base::sync_with_stdio(false);
    int n,m,c,r,x;
    in>>n;
    for(int i=1;i<=n;i++)
        in>>v[i];
    in>>m;
    for(int i=1;i<=m;i++)
    {
      in>>c>>x;
      if(c==0)r=cautbin0(x,n);
      else if(c==1)r=cautbin1(x,n);
      else if(c==2)r=cautbin2(x,n);
      out<<r<<"\n";
    }
    return 0;
}