String Matching in an Array.java

class Solution {
    public List<String> stringMatching(String[] words) {
        List<String>ans = new ArrayList<>();
        for(int i=0; i<words.length; i++){
            String s = words[i];
            for(int j=0; j<words.length; j++){
                if(i == j){
                    continue;
                }
                if(words[j].indexOf(s) >= 0){
                    ans.add(s);
                    break;
                }
            }
        }
        return ans;
    }
}