Cod sursa(job #2131528)

Utilizator ioanaa_ghGhiorghi Ioana-Cristina ioanaa_gh Data 14 februarie 2018 19:18:57
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.33 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int a[100005];
void Caut0(int st, int dr, int x)
{
    int mij;
    while(st<dr)
    {
        mij=(st+dr)/2;
        if(a[mij]<=x)
            st=mij+1;
        else
            dr=mij-1;
    }
    mij=(st+dr)/2;
    if(a[mij]>x) mij--;
    if(a[mij]==x)
        fout << mij;
    else
        fout << "-1";
}

void Caut1(int st, int dr, int x)
{
    int mij;
    while(st<dr)
    {
        mij=(st+dr)/ 2;
        if (a[mij]<=x)
            st=mij+1;
        else
            dr=mij;
    }
    mij=(st+dr)/2;
    if(a[mij]>x) mij--;
    fout << mij;
}

void Caut2(int st, int dr, int x)
{
    int mij;
    while(st<dr)
    {
        mij=(st+dr)/ 2;
        if (a[mij]<x)
            st=mij+1;
        else
            dr=mij;
    }
    mij=(st+dr)/2;
    if(a[mij]<x) mij++;
    fout << mij;
}

int main()
{
    int i, n, m, y, x;
    fin >> n;
    for(i = 1 ; i <= n ; ++i)
        fin >> a[i];
    fin >> m;
    for(i = 1 ; i <= m ; ++i)
    {
        fin >> y >> x;
        if(y==0)
            Caut0(1,n,x);
        else if(y==1)
            Caut1(1,n,x);
        else
            Caut2(1,n,x);
        fout<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}