The string "PAYPALISHIRING" is written in a zigzag patter...[作者空间]

Given a string s, find the longest palindromic substring ...[作者空间]

There is a table World A country is big if it has an area...[作者空间]

Given a binary matrix A, we want to flip the image horizo...[作者空间]

There is a robot starting at position (0, 0), the origin,...[作者空间]

Given a string S that only contains "I" (increase) or "D"...[作者空间]

International Morse Code defines a standard encoding wher...[作者空间]

You're given strings J representing the types of stones t...[作者空间]