Math - Michael's Blog

Math

A collection of 4 posts

Strobogrammatic Number

246. Strobogrammatic Number [https://leetcode.com/problems/strobogrammatic-number/description/] A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to determine if a number is strobogrammatic. The number is represented as a string. For example, the numbers "69", "88"

Plus One

66. Plus One [https://leetcode.com/problems/plus-one/] Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. You may assume the integer do not contain any leading zero, except the number 0 itself. The digits are stored such that the most significant digit

Strobogrammatic Number II

247. Strobogrammatic Number II [https://leetcode.com/problems/strobogrammatic-number-ii] A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Find all strobogrammatic numbers that are of length = n. For example, Given n = 2, return ["11","69","88","96"]. n = 0: none n

Max Points on a Line

LintCode-186.Max Points on a Line [http://www.lintcode.com/en/problem/max-points-on-a-line/] > Given n points on a 2D plane, find the maximum number of points that lie on the same straight line. > Example > Given 4 points: (1,2), (3,6), (0,0), (1,3). > The maximum number is 3.