You are given a string ~s~. We want to partition the string into as many parts as possible so that each letter appears in at most one part. For example, the string ~"ababcc"~ can be partitioned into ~["abab", "cc"]~, but partitions such as ~["aba", "bcc"]~ or ~["ab", "ab", "cc"]~ are invalid.
Note that the partition is done so that after concatenating all the parts in order, the resultant string should be ~s~.
Return /a list of integers representing the size of these parts/.
*Example 1:*
#+begin_src
Input: s = "ababcbacadefegdehijhklij"
Output: [9,7,8]
Explanation:
The partition is "ababcbaca", "defegde", "hijhklij".
This is a partition so that each letter appears in at most one part.
A partition like "ababcbacadefegde", "hijhklij" is incorrect, because it splits s into less parts.