Cod sursa(job #2611503)

Utilizator RNedelcuNedelcu Radu RNedelcu Data 6 mai 2020 23:14:42
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <iostream>
#include <fstream>

using namespace std;

int v[100010],N,M;

int CB0(int st, int dr, int x)

{
    int mij;
    if(st<=dr)
    {
        mij=st+(dr-st)/2;
        if(v[mij+1]==x)
            return mij+1;
        if(v[mij]<=x)
            return CB0(mij+1,dr,x);
        else
            return CB0(st,mij,x);
    }
    else return -1;
}

int CB1(int st, int dr, int x)
{

    int mij;
    if(st<=dr)
    {
        mij=st+(dr-st)/2;
        if(v[mij+1]==x)
            return mij+1;
        if(v[mij]<=x)
            return CB1(mij+1,dr,x);
        else
            return CB1(st,mij,x);
    }
    else return -1;

}

int CB2(int st,int dr,int x)
{

    int mij;
    if(st<=dr)
    {
        mij=st+(dr-st)/2;
        if(v[mij-1]==x)
            return mij-1;
        if(v[mij]<x)
            return CB1(mij+1,dr,x);
        else
            return CB1(st,mij,x);
    }
    else return -1;
}

int main()
{
    ifstream f("cautbin.in");
    ofstream g ("cautbin.out");
    int op,val;
    f>>N;
    for (int i=1; i<=N; i++) f>>v[i];
    f>>M;
    for(int i=0; i<M; i++)
    {
        f>>op>>val;
        if(op==0) g<<CB0(1,N,val)<<endl;
        else if(op==1)g<<CB1(1,N,val)<<endl;
        else
            g<<CB2(1,N,val)<<endl;
    }

    return 0;
}