#include <cstdlib>
#include <iostream>
#include <limits>

void mallocbsearch(std::size_t lower, std::size_t upper)
{
    std::cout<<"["<<lower<<", "<<upper<<"]\n";
    if(upper-lower==1)
    {
        std::cout<<"Found! "<<lower<<"\n";
        return;
    }
    std::size_t mid=lower+(upper-lower)/2;
    void *ptr=std::malloc(mid);
    if(ptr)
    {
        free(ptr);
        mallocbsearch(mid, upper);
    }
    else
        mallocbsearch(lower, mid);
}

int main()
{
    mallocbsearch(0, std::numeric_limits<std::size_t>::max());
    return 0;
}