Leetcode 1593. Split a String Into the Max Number of Unique Substrings
Given a string s, return the maximum number of unique substrings that the given string can be split into.You can split string s into any list of non-empty substrings, where the concatenation of the substrings forms the original string. However, you must split the substrings such that all of them are unique.
A substring is a contiguous sequence of characters within a string.
Example 1:
Input: s = "ababccc"
Output: 5
Explanation: One way to split maximally is ['a', 'b', 'ab', 'c', 'cc']. Splitting like ['a', 'b', 'a', 'b', 'c', 'cc'] is not valid as you have 'a' and 'b' multiple times.
Example 2:
Input: s = "aba"
Output: 2
Explanation: One way to split maximally is ['a', 'ba'].
Example 3:
Input: s = "aa"
Output: 1
Explanation: It is impossible to split the string any further.
Constraints:
1 <= s.length <= 16
s contains only lower case English letters.
class Solution:
def maxUniqueSplit(self, s: str) -> int:
def backtrack(s, hashset):
max_val = 0
for i in range(1, len(s) + 1):
curt = s[:i]
if curt not in hashset:
hashset.add(curt)
max_val = max(max_val, 1 + backtrack(s, hashset))
hashset.discard(curt)
return max_val
return backtrack(s, set())
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