7 lines java solution

  • 1

    I have to say java stream is really inefficient and slow, you can replace computeIfAbsent with conventional java code, but I use it because it makes my code short and clean, but it is really really slow:

        public List<List<String>> groupAnagrams(String[] strs) {
            Map<String, List<String>> map = new HashMap<>();
            for (String str : strs) {
                char[] chars = str.toCharArray();
                String key = String.valueOf(chars);
                map.computeIfAbsent(key, k -> new ArrayList<>()).add(str);
            return new ArrayList<>(map.values());

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