IsSubsequence.java

/*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: true
Example 2:
Input: s = "axc", t = "ahbgdc"
Output: false*/
import java.util.*;
class IsSubsequence{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		String s=sc.next();
		String t=sc.next();
		System.out.print(isSubsequnce(s,t));
	}
	public static boolean isSubsequnce(String s,String t){
		int i=0,j=0;
		while(i<s.length() && j<t.length()){
			if(s.charAt(i)==t.charAt(j)) i++;
			j++;
		}
		return i==s.length();
	}
}