Cod sursa(job #1691257)

Utilizator numedeutilizatorDaniel Meszaros numedeutilizator Data 17 aprilie 2016 17:41:16
Problema Cautare binara Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.89 kb
#include <iostream>
#include <fstream>

using namespace std;

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

unsigned int n, m, v[100001], i, x, p, lt, rt, mid;
int found;

int main()
{
    f >> n;
    for(i = 1; i <= n; i++)
        f >> v[i];
    f >> m;
    for(i = 1; i <= m; i++)
    {
        f >> p >> x;
        lt = 0;
        rt = n;
        found = -1;
        while(lt <= rt)
        {
            mid = lt + (rt-lt)/2;
            if(p == 0)
            {
                if(v[mid] == x)
                {
                        while(v[mid+1] == x)
                            mid++;
                        found = mid;
                        break;
                    }
                else if(v[mid] < x)
                    lt = mid+1;
                else if(v[mid] > x)
                    rt = mid-1;
            }
            else if(p == 1)
            {
                if(v[mid] <= x)
                {

                        while(v[mid+1] <= x && mid < n)
                            mid++;
                        found = mid;
                        break;
                    }
                /*else if(v[mid] < x)
                    lt = mid+1;*/
                else if(v[mid] > x)
                    rt = mid-1;
            }
            else if(p == 2)
            {
                if(v[mid] >= x)
                {

                        while(v[mid-1] >= x)
                            mid--;
                        found = mid;
                        break;
                    }

                else if(v[mid] < x)
                    lt = mid+1;
                else if(v[mid] > x)
                    rt = mid-1;
            }

            //}
        }
        if(found == -1)
            g << -1 << "\n";
        else
            g << found << "\n";

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