You are given an m x n matrix grid, sorted in non-increasing order both row-wise and column-wise. Your task is to determine how many negative numbers are present in the grid.
You are given a list of events where each event is represented by a pair [startDay, endDay]. Your task is to find the maximum number of events you can attend, ensuring that you attend only one event per day.
You are given an array of integers. Sort the array based on the number of 1’s in the binary representation of each integer. If two integers have the same number of 1’s, sort them in ascending order of the integer value.
A supermarket offers various products, each with an associated price. The customers make purchases where the subtotal is calculated based on the prices and quantities of the products they buy. Every nth customer gets a discount on their subtotal, and the final bill is calculated accordingly.
In a special ranking system, each voter assigns a rank to all participating teams in a competition. The rankings are based on the most first-place votes, then second-place votes, and so on. If there is still a tie, teams are ranked alphabetically.