[LeetCode] Number of 1 Bits 位1的個數
Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example ...
原文：[LeetCode] Number of Atoms 原子的個數
Given a chemicalformula 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. or ...
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