You are given the head of a linked list. Delete the middle node, and return the head of the modified linked list.

You are given the head of a linked list. Delete the middle node, and return the head of the modified linked list.

You are given the head of a linked list. Delete the middle node, and return the head of the modified linked list.

No exerpt.

Given two 0-indexed integer arrays nums1 and nums2, return a list answer of size 2 where:

Given an array of integers arr, return true if the number of occurrences of each value in the array is unique or false otherwise.

No exerpt.

Given a 0-indexed n x n integer matrix grid, return the number of pairs (ri, cj) such that row ri and column cj are equal.

Given a 0-indexed n x n integer matrix grid, return the number of pairs (ri, cj) such that row ri and column cj are equal.

No exerpt.

No exerpt.

No exerpt.

No exerpt.

No exerpt.

No exerpt.

No exerpt.

Given a string s and an integer k, return the maximum number of vowel letters in any substring of s with length k.

You are given an integer array nums consisting of n elements, and an integer k.

No exerpt.

You are given an integer array nums and an integer k.