Tuesday, May 17, 2022

Easy_Question18 : Is Subsequence

  • A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. 

  • (ie, "ace" is a subsequence of "abcde" while "aec" is not).

Example 1:
  • input: s = "abc", t = "ahbgdc"
  • Output: true
Example 2:
  • Input: s = "axc", t = "ahbgdc"
  • Output: false
Solution :

public boolean isSubsequence(String s, String t) {
        return true;

    int i=0;
    int j=0;    
    while(i<s.length() && j<t.length()){


               return true;
    return false;

Time Complexity

O(min(M , N)) as we keep iterating until i or j becomes zero. M and N are the lengths of the strings.

Space Complexity

O(1) as we use constant space in the memory.

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