Keyboard Row.java

// Runtime: 0 ms (Top 100.0%) | Memory: 41.50 MB (Top 13.89%)

class Solution {
    public String[] findWords(String[] words) {
        String s1 = "qwertyuiopQWERTYUIOP";
        String s2 = "asdfghjklASDFGHJKL";
        String s3 = "zxcvbnmZXCVBNM"; 
        ArrayList<String> list = new ArrayList<>();
        for(int i=0;i<words.length;i++){
            int count1=0,count2=0,count3=0,len=words[i].length();
            for(int j=0;j<len;j++){
                if(s1.contains(Character.toString(words[i].charAt(j))))
                    count1++;
                else if(s2.contains(Character.toString(words[i].charAt(j))))
                    count2++;
                else if(s3.contains(Character.toString(words[i].charAt(j))))
                    count3++;
                if(count1==len || count2==len || count3==len)
                    list.add(words[i]);
            }
        }
        String ans[] = new String[list.size()];
        list.toArray(ans);
        return ans;
    }
}