Cod sursa(job #1051760)

Utilizator MarcusPopMarcus Pop MarcusPop Data 10 decembrie 2013 16:20:49
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.09 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int v[100005],n;
int op0(int x)
{
    int st=1,dr=n,m;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(v[m]<x)
            st=m+1;
        else
            dr=m;
    }
    for(;st<n && v[st]==x;++st);
    if(v[st]>x)
        --st;
    if(v[st]!=x)
        return -1;
    return st;
}
int op1(int x)
{
    int st=1,dr=n,m;
    while(st<dr)
    {
        m=(st+dr+1)/2;
        if(v[m]>x)
            dr=m-1;
        else
            st=m;
    }
    return st;
}
int op2(int x)
{
    int st=1,dr=n,m;
    while(st<dr)
    {
        m=(st+dr)/2;
        if(v[m]<x)
            st=m+1;
        else
            dr=m;
    }
    return st;
}
int main ()
{
    int x,tip,m;
    f>>n;
    for(int i=1;i<=n;++i)
        f>>v[i];
    f>>m;
    for(int j=1;j<=m;++j)
    {
        f>>tip>>x;
        if(tip==0)
            g<<op0(x);
        if(tip==1)
            g<<op1(x);
        if(tip==2)
            g<<op2(x);
    }
    return 0;
}