Find all Anagrams in a String
   Given a string s  and a non-empty  string p , find all the   start indices of p 's anagrams in s .      Strings consists of lowercase English letters only and the length of both   strings s  and p  will not be larger than 20,100.   The order of output does not matter.   Example 1:  Input:  s: "cbaebabacd" p: "abc"  Output:  [0, 6]  Explanation:  The substring with start index = 0 is "cba", which is an anagram of "abc". The substring with start index = 6 is "bac", which is an anagram of "abc".   Example 2:  Input:  s: "abab" p: "ab"  Output:  [0, 1, 2]  Explanation:  The substring with start index = 0 is "ab", which is an anagram of "ab". The substring with start index = 1 is "ba", which is an anagram of "ab". The substring with start index = 2 is "ab", which is an anagram of "ab".  METHOD 1:        class Solution {      public List<Intege...