392. Is Subsequence

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:

1 2	Input: s = "abc", t = "ahbgdc" Output: true

Example 2:

1 2	Input: s = "axc", t = "ahbgdc" Output: false

TC: O(n) SC:O(1)
class Solution {
    public boolean isSubsequence(String s, String t) {
        int ls = s.length(), lt = t.length(), i = 0;
        if(ls>lt) return false;
        for(int j = 0;j<lt && i<ls;j++)
            if(t.charAt(j) == s.charAt(i)) i++;
        return i == s.length();  
    }
}

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