Determine if a string is "cool" - all characters have the same frequency or can become cool by removing exactly one character.
Examples:
Implement a card shuffling algorithm for multiple 52-card decks.
Requirements:
Function Signature:
struct Card {
string suit;
string rank;
};
list<Card> shuffleAllDecks(const list<Card>& all_decks);
Design a system to track and aggregate stock transaction volumes.
Requirements:
Focus on:
Print the string inside the deepest set of parentheses.
Example:
A string is valid if all characters of the string appear the same number of times. It is also valid if we can remove just 1 character in the string, and the remaining characters will occur the same number of times. Given a string s, determine if it is valid. If so, return true, otherwise return false.
Examples:
Design a data structure that supports the following operations: insert, delete, getRandom. All operations should be done in average O(1) time complexity.
See: https://leetcode.com/problems/insert-delete-getrandom-o1/
Follow-up: https://leetcode.com/problems/insert-delete-getrandom-o1-duplicates-allowed/