Java. DFS. Try to make it easy.

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    public class Solution {
        public List<String> generateParenthesis(int n) {
            List<String> res = new ArrayList<>();
            track(n, 1, 0, new String("("), res);
            return res;
        private void track(int n, int open, int close, String comb, List<String> res){
            if(open>n || close>open) return;
            if(open == n && close == n) {
                res.add(new String(comb));
            track(n, open+1, close, comb+"(", res);
            track(n, open, close+1, comb+")", res);

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