给你一个整数 n。

You are given an integer n. Return the total number of commas used when writing all integers from [1, n] (inclusive) in standard number formatting. In standard formatting:

矩形以列表 [x1, y1, x2, y2] 的形式表示，其中 (x1, y1) 为左下角的坐标，(x2, y2) 是右上角的坐标。矩形的上下边平行于 x 轴，左右边平行于 y 轴。 如果相交的面积为 正 ，则称两矩形重叠。需要明确的是，只在角或边接触的两个矩形不构成重叠。 给出两个矩形 rec1 和 rec2 。如果它们重叠，返回 true；否则，返回 false 。   示例 1： 输入：rec1 = [0,0,2,2], rec2 = [1,1,3,3] 输出：true 示例 2： 输入：rec1…

An axis-aligned rectangle is represented as a list [x1, y1, x2, y2], where (x1, y1) is the coordinate of its bottom-left corner, and (x2, y2) is the coordinate of its top-right corner. Its top and bottom edges are parallel to the X-axis, and its left and…