224. Basic Calculator(Leetcode每日一题-2021.03.10)--抄答案

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Problem

Given a string s representing an expression, implement a basic calculator to evaluate it.

Constraints:

• 1 <= s.length <= 3 * 10^5
• s consists of digits, ‘+’, ‘-’, ‘(’, ‘)’, and ’ '.
• s represents a valid expression.

Example1

Input: s = “1 + 1”
Output: 2

Example2

Input: s = " 2-1 + 2 "
Output: 3

Example3

Input: s = “(1+(4+5+2)-3)+(6+8)”
Output: 23

Solution

class Solution {
public:void eval(stack<int> &num,stack<char> &op){auto b = num.top();num.pop();auto a = num.top();num.pop();

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