LeetCode周赛4月9日

题目代码：

t1:https://pastebin.ubuntu.com/p/r8YnWHgrq4/ 

t2:https://pastebin.ubuntu.com/p/6kVmzyhqh5/

t3:https://pastebin.ubuntu.com/p/JngWtgHQ9c/

t4:https://pastebin.ubuntu.com/p/gk3d5WPGzb/