Cod sursa(job #848773)

Utilizator PetrutiuPaulPetrutiu Paul Gabriel PetrutiuPaul Data 5 ianuarie 2013 19:14:45
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.21 kb
#include<fstream>
using namespace std;
int a[100001];
int caut0x( int st, int dr,int x)
{
int mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]<=x)
            st=mij+1;
        else
            dr=mij-1;
    }
    mij=(st+dr)/2;
    if(a[mij]>x)
		mij--;
    if(a[mij]==x)
        return mij;
    else
        return -1;
}
int caut1x(int st,int dr,int x)
{
int mij;
    while(st<dr)
    {
        mij=(st+dr)/2;
        if(a[mij]<=x)
            st=mij+1;
        else
            dr=mij;
    }
    mij=(st+dr)/2;
    if(a[mij]>x)
        mij--;
    return mij;
}
int caut2x (int st, int dr, int x)
{
int mij;
    while(st<dr)
    {
        mij=(st+dr)/2;
        if(a[mij]>=x)
            dr=mij;
        else
            st=mij+1;
    }
    mij=(st+dr)/2;
    if(a[mij]<x)
        mij++;
    return mij;
}
int main()
{
int i,n,m,x,y;
    ifstream f("cautbin.in");
    ofstream g("cautbin.out");
    f>>n;
    for(int i=1;i<=n;i++)
        f>>a[i];
    f>>m;
    for(int i=1;i<=m;i++)
    {
        f>>y>>x;
        if(y==0)g<<caut0x(1,n,x)<<"\n";
        if(y==1)g<<caut1x(1,n,x)<<"\n";
        if(y==2)g<<caut2x(1,n,x)<<"\n";
    }
    return 0;
}