Can you solve this real interview question? Number of Atoms - Given a string formula representing a chemical formula, return the count of each atom. The atomic element always starts with an uppercase character, then zero or more lowercase letters, repre
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...
One could try to estimate the number of atoms in the universe or try to find out how many seconds have elapsed since the Big Bang or even try to count how many games of chess are possible," Trevi[+ or -]o said. There's a big need for big numbers In such cases, only a limited...
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 ...
www.360doc.com|基于 1 个网页 2. 原子量 若钾原子(Potassium)内的原子量(Number of atoms)是16克氧(Oxygen)原子的两倍,求钾原子的摩尔数(Number of m… www.gemeilia.com|基于 1 个网页 例句
classSolution {public:stringcountOfAtoms(stringformula) {stringres ="";intpos =0; map<string,int> m =parse(formula, pos);for(auto a : m) { res+= a.first + (a.second ==1?"": to_string(a.second)); }returnres; } map<string,int> parse(string& str,int&pos) { ...
Number of Atoms 传送门:726. Number of Atoms Problem: 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 ...
Number of atoms=0.3×6.02×1023=1.806×1023atoms 5. Round the Result: - We can round 1.806×1023 to 1.8×1023 for simplicity. 6. Conclusion: - Therefore, the number of atoms in 0.3 moles of sodium is approximately 1.8×1023 atoms. Final Answer:The number of atoms in 0.3 moles of sodiu...
Counting the Number of Atoms in a Formula Unit Step 1: Identify the given chemical formula and the constituting elements. Step 2: Find the number of atoms of each element in the chemical formula from the subscripts of each symbol. Counting the Number of Atoms in a Formula Unit Vocabulary...
726. Number of Atoms Given a chemical formula (given as a string),returnthe 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 followifthe ...