#pragma once

#include <iterator>

template<typename T, typename It, typename Tag>
It Find_(const T &value, It first, It last, Tag tag) {
  for (; first != last; ++first) {
    if (*first == value) {
      return first;
    }
  }
  return last;
}

template<typename T, typename It>
It Find_(const T &value, It first, It last, std::random_access_iterator_tag) {
  It l = first;
  It r = last;
  while (l < r) {
    It mid = l + (r - l) / 2;
    if (value < *mid) {
      r = mid;
    } else {
      l = mid + 1;
    }
  }
  r--;
  if (*r == value) {
    return r;
  }
  return last;
}

template<typename T, typename It>
It Find(const T &value, It first, It last) {
  return Find_(value, first, last,
    typename std::iterator_traits<It>::iterator_category());
}