How to Find the Shortest Word in C++

The challenge

Simple, given a string of words, return the length of the shortest word(s).

The string will never be empty and you do not need to account for different data types.

The solution in C++

Option 1:

int find_short(const std::string &str) {
    std::istringstream inp(str);
    std::string s;
    int len = -1;
    while (std::getline(inp, s, ' '))
        if (s.length() < len)
            len = s.length();
    return len;

Option 2:

int find_short(std::string str) {
    std::istringstream iss(str);
    std::vector<std::string> vec{ std::istream_iterator<std::string>(iss), {} };
    return std::min_element(vec.begin(), vec.end(), [](const std::string& s1, const std::string& s2) { return s1.length() < s2.length(); })->length();

Option 3:

#include <sstream>

int find_short(std::string str) {
  std::stringstream ss(str);
  auto buff = std::string();
  auto shorter = std::numeric_limits<size_t>::max();
  while (ss >> buff)
    shorter = min(shorter, buff.size());
  return shorter;

Test cases to validate our solution

    Assert::That(find_short("bitcoin take over the world maybe who knows perhaps"), Equals(3));
    Assert::That(find_short("turns out random test cases are easier than writing out basic ones"), Equals(3));
    Assert::That(find_short("lets talk about javascript the best language"), Equals(3));
    Assert::That(find_short("i want to travel the world writing code one day"), Equals(1));
    Assert::That(find_short("Lets all go on holiday somewhere very cold"), Equals(2));
    Assert::That(find_short("Let's travel abroad shall we"), Equals(2));