#include "s0028_find_the_index_of_the_first_occurrence_in_a_string.hpp"

int Solution::strStr(string haystack, string needle) {
  int haystackLen = haystack.length();
  int needleLen = needle.length();
  for (int i{0}; i < haystackLen; ++i) {
    for (int j{0}, iTmp = i; j < needleLen; ++j) {
      if (haystack[iTmp] != needle[j]) {
        break;
      } else if (j == needleLen - 1) {
        return i;
      } else {
        ++iTmp;
      }
    }
  }
  return -1;
}