L丶K丶的博客

Looking at the input matrix and the output matrix, we can easily find that it rotates  90°  clockwise. And I implement that by rotating every "circle" of it. First I rotate the outmost circle,

To solve the problem about Binary Tree, I still used Recursive Method. Here, I still wrote another function to help traverse. And I still declared the variable outside the two functions. S

Talking about Binary Tree, I will often think of Recursion. To traverse the binary tree, I always use Recursive Method. So here, to find the maximum depth of binary tree, I wrote another fu

In this program, I used Bubble Sort to sort the array first. Then, I declared a variable "count" to represent the First Missing Positive Integer. (Because the way I used it is similar to when I am