number = '' if c in ['+', '-']: # - check operator level with op_stack[-1], # - if current level is not greater than op in stack, # - calculate the op in stack while op_stack and (op_stack[-1][1] >= level): calc_op() # - push current op in op_stack op_stack....
LeetCode 第772题 Basic Calculator III 简要分析及Python代码 题目: 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...
227.Basic Calculator II 题意:和1相比,增加了乘号和除法,不过反而把括号去掉了,求表达式结果。 栈 下面是基于Python2,因为LeetCode只允许Python2,需要注意的是,//得到的是它们的商再向下取整,特别是负数的时候。比如: print3//2# 1print-3//2# -2 思路:使用sign保存上一个表达式的运算符,如果+或者-,则...
pythonlearnbeginnerhelpbasicimprovelearnpython 11th Jan 2022, 3:07 PM K Ka + 6 You can add a try-except statement to prevent Zero division error for division operator. 11th Jan 2022, 3:37 PM Simba + 1 SimbaI have now added this in, thank you!! What do you think?
【LeetCode】227. Basic Calculator II 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/basic-calculator-ii/description/ 题目描述: Implement a basic calculator to evaluate a simple expression string...
执行用时:92 ms, 在所有 Python 提交中击败了80.00%的用户 内存消耗:13.9 MB, 在所有 Python 提交中击败了96.25%的用户 参考资料链接: 力扣leetcode-cn.com/problems/basic-calculator/solution/ru-he-xiang-dao-yong-zhan-si-lu-lai-zi-y-gpca/...
for k2, v2 in other.items(): key = tuple(sorted(k1 + k2)) value = v1 * v2 ans[key] += value return ans class Solution: def basicCalculatorIV(self, expression: str, evalvars: List[str], evalints: List[int]) -> List[str]: ...
Python 实现 class Solution: def calculate(self, s: str) -> int: stack = [] operand = 0 res = 0 # For the on-going result sign = 1 # 1 means positive, -1 means negative for ch in s: if ch.isdigit(): # Forming operand, since it could be more than one digit operand = (...
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This repository contains the solutions and explanations to the algorithm problems on LeetCode. Only medium or above are included. All are written in C++/Python and implemented by myself. The problems attempted multiple times are labelled with hyperlinks.