import java.util.List; /* * 递归遍历实现 * */ public class Solution { Character []record; List<String> resList=new ArrayList<String>(); public List<String> generateParenthesis(int n) { record=new Character[2*n]; getAll(0,n,n); return resList; } public void getAll(int k, int le...
Here, the expressionn & (n-1)unsets the rightmost set bit of a numbern. It works as the expressionn-1flips all the bits after the rightmost set bit ofn, including the rightmost set bit itself. As a consequence,n & (n-1)unsets the last set bit ofn. Following is the C++, Java,...