Example 1:
Input: text1 = "cat", text2 = "crabt"
Output: 3
Explanation:
Example 2:
Input: text1 = "abcd", text2 = "abcd"
Output: 4
Example 3:
Input: text1 = "abcd", text2 = "efgh"
Output: 0
Given two strings text1 and text2, return the length of the longest common subsequence between the two strings if one exists, otherwise return 0.
A subsequence is a sequence that can be derived from the given sequence by deleting some or no elements without changing the relative order of the remaining characters.
"cat" is a subsequence of "crabt".A common subsequence of two strings is a subsequence that exists in both strings.
The longest common subsequence is "cat" which has a length of 3.
1 <= text1.length, text2.length <= 1000text1 and text2 consist of only lowercase English characters.