11. 392. Is Subsequence

class Solution {
    public boolean isSubsequence(String s, String t) {
        int i=0,j=0,m=s.length(),n=t.length();
        if(s.isEmpty()){
            return true;
        }

        while(i<m && j<n){
            char ch = s.charAt(i);
            char ch2 = t.charAt(j);
            if(ch==ch2){
                i++;
                j++;
            }else{
                j++;
            }

            if(i>=m){
                return true;
            }
        }
        return false;
        
    }
}