Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.
columnTitle
For example:
A -> 1B -> 2C -> 3...Z -> 26AA -> 27AB -> 28 ...
Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
needle
haystack
-1
Example 1:
Input: haystack =…
Write a function that takes the binary representation of an unsigned integer and returns the number of '1' bits it has (also known as the Hamming weight).
Note:
Given the root of a binary tree, return the inorder traversal of its nodes' values.
root
Input: root = [1,null,2,3]Output: [1,3,2]
Example 2:
Input: root = []…
Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must appear as many times as it shows in both arrays and you may return the result in any order.
nums1
nums2