문제 At a lemonade stand, each lemonade costs $5. Customers are standing in a queue to buy from you and order one at a time (in the order specified by bills). Each customer will only buy one lemonade and pay with either a $5, $10, or $20 bill. You must provide the correct change to each customer so that the net transaction is that the customer pays $5. Note that you do not have any change in hand ..

문제 You are given an integer array nums and an integer k. For each index i where 0

문제 Given an integer array nums, return the largest perimeter of a triangle with a non-zero area, formed from three of these lengths. If it is impossible to form any triangle of a non-zero area, return 0. nums 배열이 들어오면, 그 중 세 개의 요소로 이루어진 삼각형의 가장 큰 둘레를 반환한다. 삼각형을 만드는 것이 불가능하면 0을 반환한다. 예시 Example 1: Input: nums = [2,1,2] Output: 5 Example 2: Input: nums = [1,2,1] Output: 0 제약조건 Constraints: 3