Cod sursa(job #2167965)

Utilizator andrei32576Andrei Florea andrei32576 Data 14 martie 2018 08:37:57
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.18 kb
#include<fstream>
using namespace std;

int n,i,v[100005],m,op,x;

ifstream f("cautbin.in");
ofstream g("cautbin.out");

int caut(int x)
{
    int ls=1,ld=n;
    while(ls<=ld)
    {
        int m=(ls+ld)/2;
        if(x<v[m]) ld=m-1;
        else if(x>=v[m]) ls=m+1;
    }
    int m=(ls+ld)/2;
    if(v[m]>x) m--;
    if(v[m]==x)
        return m;
    return -1;
}

int caut_min(int x)
{
    int ls=1,ld=n;
    while(ls<ld)
    {
        int m=(ls+ld)/2;
        if(v[m]<=x)
            ls=m+1;
        else
            ld=m;
    }
    int m=(ls+ld)/2;
    if(v[m]>x) m--;
    return m;
}

int caut_max(int x)
{
    int ls=1,ld=n;
    while(ls<ld)
    {
        int m=(ls+ld)/2;
        if(v[m]<x)
            ls=m+1;
        else
            ld=m;
    }
    m=(ls+ld)/2;
    if(v[m]<x) m++;
    return m;
}

int main()
{
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];

    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>op>>x;
        if(op==0)
            g<<caut(x)<<"\n";
        else if(op==1)
            g<<caut_min(x)<<"\n";
        else
            g<<caut_max(x)<<"\n";
    }

    f.close();
    g.close();
    return 0;
}