#118 - Find Common Characters

public List<String> commonChars(List<String> strs){
    //solution here
    Integer[] listCount = new Integer[26];
    for (Integer i = 0; i < 26; i++)
        listCount[i] = 2147483647;
    for (String s : strs){
        Integer[] wordCount = new Integer[26];
        for (Integer i = 0; i < 26; i++)
            wordCount[i] = 0;
        for (Integer i = 0; i < s.length(); i++){
            wordCount[s.charAt(i) - 97] = wordCount[s.charAt(i) - 97] + 1;
        }
        System.debug(wordCount);
        for (Integer i = 0; i < 26; i++)
            listCount[i] = Math.min(listCount[i], wordCount[i]);
    }
    System.debug(listCount);
    List<String> res = new List<String>();
    for (Integer i = 0; i < 26; i++){
        Integer count = listCount[i];
        while (count > 0){
            count--;
            String myChar = String.fromCharArray(new List<integer>{ i + 97 });
            res.add(myChar);
        }
    }
    return res;
}