此题真可谓是练习编程语言的绝好材料 ! import java.util.*; class Solution { class Item { Map<String, Integer> vars = new TreeMap<>(); int k = 1; String tos() { StringBuilder builder = new StringBuilder(); List<String> a = new ArrayList<>(); for (Stri…

Given an expression such as expression = "e + 8 - a + 5" and an evaluation map such as {"e": 1}(given in terms of evalvars = ["e"] and evalints = [1]), return a list of tokens representing the simplified expression, such as […

Given an expression such as expression = "e + 8 - a + 5" and an evaluation map such as {"e": 1} (given in terms of evalvars = ["e"] and evalints = [1]), return a list of tokens representing the simplified expression, such as …

Given an expression such as expression = "e + 8 - a + 5" and an evaluation map such as {"e": 1} (given in terms of evalvars = ["e"] and evalints = [1]), return a list of tokens representing the simplified expression, such as …

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…

▶ 两个四则表达式运算的题目,第 770 题 Basic Calculator IV 带符号计算不会做 Orz,第 772 题 Basic Calculator III 要收费 Orz. ▶ 自己的全能版代码,28 ms,采用表达式中缀转后缀,然后利用栈来计算.支持加减乘除幂模,一模一样的代码刷掉了这两题,就是效率比较低,28 ms class Solution { public: int calculate(string s)//计算器,输入表达式,输出计算结果 { string out; m…

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 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 contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward zero. You may assume that the given ex…