Given two strings s and t, return true if s is a subsequence of t, or false otherwise.
A subsequence of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i.e., “ace” is a subsequence of “abcde” while “aec” is not).
Example 1:
Input: s = “abc”, t = “ahbgdc”
Output: trueExample 2:
Input: s = “axc”, t = “ahbgdc”
Output: false
Is Subsequence Algorithm in GoLang
Two Pointers, moving both pointers i and j if the s[i] is equal to t[j]. Otherwise, only move pointer j until j reaches the end.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | func isSubsequence(s string, t string) bool { var ls, lt = len(s), len(t) if ls > lt { return false } var i, j = 0, 0 for i < ls && j < lt { if s[i] == t[j] { i += 1 } j += 1 } return i == ls } |
func isSubsequence(s string, t string) bool { var ls, lt = len(s), len(t) if ls > lt { return false } var i, j = 0, 0 for i < ls && j < lt { if s[i] == t[j] { i += 1 } j += 1 } return i == ls }
Assuming length of s is smaller than t – the time complexity is O(N) where N is the number of strings in t. The space complexity is O(1).
String Subsequence Algorithms:
- Teaching Kids Programming – Is Subsequence Algorithm via Recursion (Greedy)
- Teaching Kids Programming – Is Subsequence Algorithm via Two Pointer
- The Subsequence Algorithm for Two Strings – How to Check if a String is Subsequence of Another?
- GoLang Function of Checking Is Subsequence
- Algorithms to Check if a String is a Subsequence String of Another String
- in Python, you can do this in Pythonic way: Python Function to Check Subsequence
–EOF (The Ultimate Computing & Technology Blog) —
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