全部括号序列

对于长度为2N的括号序列，合法的数量为C(2N,N)/(N+1)

参考：https://blog.csdn.net/ffmpeg4976/article/details/42340379?spm=1001.2101.3001.6650.3&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-3-42340379-blog-105694263.pc_relevant_sortByStrongTime&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-3-42340379-blog-105694263.pc_relevant_sortByStrongTime&utm_relevant_index=6

标签：42340379,relevant,pc,distribute,utm,blog,括号,全部,序列
来源： https://www.cnblogs.com/ydUESTC/p/16545050.html