C/C++ Find the Difference of Two Lowercase Strings
You are given two strings s and t. String t is generated by random shuffling string s and then add one more letter at a random position. Return the …
Tag: c++
How to Count Numbers with Unique Digits?
Given a non-negative integer n, please find out the number of integers that have the unique digits between [0, 10^n). For example, if n = 2, there are 91 …
Do Thread A and B Require Mutex to Operate on High/Low of a DWORD?
Given a 32-bit DWORD, and two threads A and B, do they require Mutex (exclusive resources) to read/write the High/Low DWORD respectively? e.g. Thread A reads two low bytes …
Algorithms to Merge Two Sorted Array
There are two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. nums1 has enough space to hold additional elements from nums2. The number …
How to Swap Nodes in Pairs in a Singly Linked List?
Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list’s nodes. Only nodes itself may be changed. …