Leetcode 726. Number of Atoms 2. Solution 解析:这道题还有优化的空间,这样写主要是逻辑清晰。1. 把元素(多个字母)、数字(多个数字字符)、左右括号拆分开;2. 计算元素的个数,如果元素后没有数字,则添加数字1作为元素个数;当碰到右括号时,查找其对应的左括号,并将其中的元素个数乘以括号后的数字,其后没数...
接下来再对分子式进行分割,得出每个atom的数量后排序即可。原理很简单,代码写得很乱,仅供参考。 代码如下: classSolution(object):defrecursive(self,formula): left= right =Nonefori,vinenumerate(formula):ifv =='(': left=ielifv ==')': right=ibreakifleft == Noneandright ==None:returnformula lf=fo...
Given aformula, returnthe count of all elements as a string in the following form: the first name (in sorted order), followed by its count (if that count is more than 1), followed by the second name (in sorted order), followed by its count (if that count is more than 1), and s...
Given a chemical formula (given as a string), return the count of each atom. An atomic element always starts with an uppercase character, then zero or more lowercase letters, representing the name. 1 or more digits representing the count of that element may follow if the count is greater ...
实现参考了花花的讲解。 /** @lc app=leetcode id=726 lang=cpp** [726] Number of Atoms*/// @lc code=startclassSolution{public:stringatom(strings,int&pos){stringres;while(isalpha(s[pos])){if(res.empty()||islower(s[pos]))res+=s[pos++];elsebreak;}returnres;}intcount(strings,int...
香草**美人 上传 leetcode (getCount()和getName()函数)如果遇到(,就去递归求解,返回的是一个Map(这里用TreeMap,因为要按照字典序),Map的key就是原子,点赞(0) 踩踩(0) 反馈 所需:1 积分 电信网络下载 aggregator_2.12-0.0.49.jar 2024-11-29 08:16:01 积分:1 ...
原子的数量 jasonnk 81 2020.07.04发布于 天津 C++ 解题思路对解析过程划分状态,然后根据状态转移写程序代码class Solution { public: string countOfAtoms(string formula) { map<string, long> atomNumMap; parseString(formula, 0, formula.size()-1,atomNumMap, 1); string...
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726. Number of Atoms 难度:h class Solution: def countOfAtoms(self, formula: str) -> str: dic = {} stack = [] cure = '' curn = '' times = 1 for c in formula[::-1]: if c.isdigit(): curn = c+curn elif c.isalpha(): ...
795. Number of Subarrays with Bounded Maximum # 题目 # We are given an array nums of positive integers, and two positive integers left and right (left <= right). Return the number of (contiguous, non-empty) subarrays such that the value of the maximum