Cod sursa(job #2279138)

Utilizator MirceaCozmaciucMircea-Vlad Cozmaciuc MirceaCozmaciuc Data 8 noiembrie 2018 22:43:08
Problema Cautare binara Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");

int cautbin0(int v[100000], int st, int dr, int x)
{
    int m=(st+dr)/2;
    while(st<=dr)
    {
        m=(st+dr)/2;
        if(v[m]<=x)
            st=m+1;
        else
            dr=m-1;
    }
    m=(st+dr)/2;
    if(v[m]>x)
        m--;
    if(v[m]==x)
        return m;
    return -1;
}

int cautbin1(int v[100000], int st, int dr, int x)
{
    int m=(st+dr)/2;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(v[m]<=x)
            st=m+1;
        else
            dr=m-1;
    }
    m=(st+dr)/2;
    if(v[m]>x)
        m--;
    return m;
}
int cautbin2(int v[100000], int st, int dr, int x)
{
     int m=(st+dr)/2;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(v[m]<x)
            st=m+1;
        else
            dr=m-1;
    }
    m=(st+dr)/2;
    if(v[m]<x)
        m++;
    return m;
}

int main()
{
    int n,m,v[100000],a,b;
    f>>n;
    for(int i=1; i<=n; i++)
        f>>v[i];
    f>>m;
    for(int i=1; i<=m; i++)
    {
        f>>a>>b;
        if(a==0)
            g<<cautbin0(v,1,n,b)<<endl;
        if(a==1)
            g<<cautbin1(v,1,n,b)<<endl;
        if(a==2)
            g<<cautbin2(v,1,n,b)<<endl;
    }
    return 0;
}