Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . You may assume that the given expression is…

Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . You may assume that the given expression is…

2018-09-27 22:02:36 一.Basic Calculator II 问题描述: 问题求解: sign用来保存前一个符号,用num来记录数字,如果碰到一个符号或者到达结尾,则需要进行入栈操作,这个时候需要结合符号进行相应的运算. public int calculate(String s) { if (s == null || s.length() == 0) return 0; int res = 0; Stack<Integer> stack = new Stack<&…

实现一个基本的计算器来计算一个简单的字符串表达式. 字符串表达式可以包含左括号 ( ,右括号),加号+ ,减号 -,非负整数和空格 . 假定所给的表达式语句总是正确有效的. 例如: "1 + 1" = 2" 2-1 + 2 " = 3"(1+(4+5+2)-3)+(6+8)" = 23注意:不要使用内置的库函数 eval. 详见:https://leetcode.com/problems/basic-calculator/description/…

Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward zero. You may assume that the given ex…

Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . The expression string contains only non-nega…

Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . Example 1: Input: "1 + 1" Output: 2 Exa…

Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, /operators and empty spaces . The integer division should truncate toward zero. Example 1: Input: "3+2*2" Ou…

Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . You may assume that the given expression is…

Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . The expression string contains only non-nega…