Problem Every valid email consists of a local name and a domain name, separated by the ‘@’ sign. Besides lowercase letters, the email may contain one or…
Problem Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well.…
Problem Given a sorted array of distinct integers and a target value, return the index if the target is found.…
Problem Given a sorted array of distinct integers and a target value, return the index if the target is found.…
Problem Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of…
Problem Given a string s consisting of some words separated by some number of spaces, return the length of the…