https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock/
Say you have an array for which the ith element is the price of a given stock on day i.
If you were only permitted to complete at most one transaction (i.e., buy one and sell one share of the stock), design an algorithm to find the maximum profit.
Note that you cannot sell a stock before you buy one.
https://leetcode-cn.com/explore/learn/card/linked-list/194/two-pointer-technique/744/
Given a linked list, determine if it has a cycle in it.
https://leetcode-cn.com/problems/minimum-number-of-steps-to-make-two-strings-anagram/
Given two equal-size strings s and t. In one step you can choose any character of t and replace it with another character.
Return the minimum number of steps to make t an anagram of s.
https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array/
Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length.
Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
我觉得我住在了start…
https://leetcode-cn.com/contest/weekly-contest-176
Given a m * n matrix grid which is sorted in non-increasing order both row-wise and column-wise.