Question
Given a digit ‘3141592653’, find number of occurence of subsequence “123”. Note that the sequence occurs twice:
3141592653
1 2 3
1 2 3
Output 2.
Solution
Refer to [LeetCode 115] Distinct Subsequences.
Given a digit ‘3141592653’, find number of occurence of subsequence “123”. Note that the sequence occurs twice:
3141592653
1 2 3
1 2 3
Output 2.
Refer to [LeetCode 115] Distinct Subsequences.