题目地址：https://leetcode.com/problems/arranging-coins/ You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins. Given n, find the total nu

题目描述： You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins. Given n, find the total number of full staircase rows that can be formed