Cautare Binara

#include <iostream>
using namespace std;

int cauta(int v[], int n, int x){
    int st=0;
    int dr=n-1;
    while(st<=dr)
    {
        int mid = (st+dr)/2;
        if (v[mid]==x) return mid;
        if (v[mid] < x) st = mid+1;
        else dr = mid-1;
    }
    return -1;
}

int main()
{
    int sir[13] = {1,3,5,6,7,9,10,12,13,15,18,19,20};
    cout << cauta(sir, 13, 19) << endl;
    return 0;
}