A string S of lowercase letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most one part, and return a list of integers representing the size of these parts.
Input: S = "ababcbacadefegdehijhklij"
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.
S will have length in range [1, 500].
S will consist of lowercase letters (‘a’ to ‘z’) only.