Method dfs

solution/0400-0499/0472.Concatenated Words/Solution.java:34–50

(String w)

    }

    private boolean dfs(String w) {
        if ("".equals(w)) {
            return true;
        }
        Trie node = trie;
        for (int i = 0; i < w.length(); ++i) {
            int idx = w.charAt(i) - 'a';
            if (node.children[idx] == null) {
                return false;
            }
            node = node.children[idx];
            if (node.isEnd && dfs(w.substring(i + 1))) {
                return true;
            }
        }
        return false;
    }
}