大意: 给定括号字符串, 求多少个子序列是RSGS. RSGS定义如下: It is not empty (that is n ≠ 0). The length of the sequence is even. First $\frac{n}{2}$ charactes of the sequence are equal to "(". Last $\frac{n}{2}$ charactes of the sequence are equal to ")". 枚举…
1:主方法 package com.baidu; import java.text.NumberFormat;import java.util.ArrayList;import java.util.Stack; public class CalculateStack { static private CalculateStack cl = new CalculateStack(); //申明一个存放数字元素的栈 private Stack<String> num = new Stack<…
题目链接 : https://leetcode.com/problems/generate-parentheses/?tab=Description 给一个整数n,找到所有合法的 () pairs For example, given n = 3, a solution set is: [ "((()))", "(()())", "(())()", "()(())", "()()()" ] 递归程…
用了很一段时间的Modelsim,用TCL脚本仿真,开始注意起来它,看了些资料,有一个问题始终让我很困惑,那就是花括号 的用法,今天Google了一下,觉得有一点豁然了,记录一下.为了不让自己的翻译影响大家理解,先给出原文,再翻译一下. 第一段: THE RULE SQUARE BRACKETS are used to define a block that's run BEFORE the rest of the command on the current line, and the res…