原创 LeetCode學習篇九——Coin Change
題目：You are given coins of different denominations and a total amount of money amount. Write a function to compute t
2020-06-26 09:58:31
原创 LeetCode學習篇十三——Perfect Squares
題目：Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, …) which
2020-06-26 09:58:31
原创 LeetCode學習篇十六——Best Time to Buy and Sell Stock
題目：Say you have an array for which the i^th element is the price of a given stock on day i. If you were only permit
2020-06-26 08:49:28
原创 leetcode學習篇六——Binary Tree Paths
題目：Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2
2020-02-21 01:53:35
原创 LeetCode學習篇十九——Climbing Stairs
題目： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 st
2020-02-21 01:53:35
原创 leetcode學習篇七——Find Minimum in Rotated Sorted Array
試了一些pick one功能，隨機選取了一道題，題目如下： 153. Find Minimum in Rotated Sorted Array Suppose a sorted array is rotated at some
2020-02-21 01:53:35
原创 LeetCode學習篇一——Counting Bits
題目：Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’
2020-02-21 01:53:35
原创 LeetCode學習篇十八——Best Time to Buy and Sell Stock with Cooldown
題目：Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to f
2020-02-21 01:53:35
原创 leetcode學習篇四——Majority Element
題目如下： Given an array of size n, find the majority element. The majority element is the element that appears more t
2020-02-21 01:53:34
原创 LeetCode學習篇十二——Count Numbers with Unique Digits
題目：Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10^n. Example: Given n =
2020-02-21 01:53:34
原创 leetcode學習篇十——Is Subsequence
題目：Given a string s and a string t, check if s is subsequence of t. You may assume that there is only lower case En
2020-02-21 01:53:34
原创 LeetCode學習篇十四——House Robber
題目：You are a professional robber planning to rob houses along a street. Each house has a certain amount of money st
2020-02-21 01:53:34
原创 LeetCode學習篇十五——Unique Binary Search Trees
題目：Given n, how many structurally unique BST’s (binary search trees) that store values 1…n? For example, Given n =
2020-02-21 01:53:34
原创 LeetCode學習篇十一——Range Sum Query - Immutable
題目：Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example:
2020-02-21 01:53:34
原创 LeetCode學習篇八—— Arithmetic Slices
題目：A sequence of number is called arithmetic if it consists of at least three elements and if the difference betwee
2020-02-21 01:53:34