Cod sursa(job #1868153)

Utilizator MishulikMihai Zgonea Mishulik Data 4 februarie 2017 17:07:22
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.19 kb
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int n, v[100001];
int regula0(int x)
{
    int p=1, u=n, m;
    while(p<=u)
    {
        m=(p+u)/2;
        if(v[m]<=x)
            p=m+1;
        else
            u=m-1;
    }
    m=(p+u)/2;
    if(v[m]>x)
        m--;
    if(v[m]==x)
        return m;
    else
        return -1;
}
int regula1(int x) {
    int m, p=1, u=n;
    while(p<u)
    {
        m=(p+u)/2;
        if (v[m]<=x)
            p=m+1;
        else
            u=m;
    }
    m=(p+u)/2;
    if(v[m]>x)
       --m;
    return m;
}
int regula2(int x) {
    int m, p=1, u=n;
    while(p<u)
    {
        m=(p+u)/2;
        if (v[m]<x)
            p=m+1;
        else
            u=m;
    }
    m=(p+u)/2;
    if(v[m]<x)
       ++m;
    return m;
}
int main()
{
    int m, tip, x;
    fin>>n;
    for(int i=1; i<=n; i++)
        fin>>v[i];
    fin>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>tip>>x;
        if(tip==0)
            fout<<regula0(x)<<'\n';
        else if(tip==1)
            fout<<regula1(x)<<'\n';
        else
            fout<<regula2(x)<<'\n';
    }
}