James Pan

原题网址：https://leetcode.com/problems/android-unlock-patterns/ Given an Android 3x3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the total number of unlock patterns of the An

原题网址：https://leetcode.com/problems/letter-combinations-of-a-phone-number/ Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to l