[LeetCode]Rotate Image

/***************************************************************************************************
You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Follow up:
Could you do this in-place?
***************************************************************************************************/
#include<stdio.h>

void rotate(int** matrix, int matrixRowSize, int matrixColSize) {
    int i,j,k,temp,head = 0,tail = matrixRowSize - 1;

        while(head <= tail){
        for(i = head;i < tail;i++){//转换一圈的坐标
            j = matrixRowSize - head - 1;
            k = matrixRowSize - i - 1;
            temp = matrix[head][i];
            matrix[head][i] = matrix[k][head];
            matrix[k][head] = matrix[j][k];
            matrix[j][k] = matrix[i][j];
            matrix[i][j] = temp;
        }
        head++;
        tail--;
      }
}

void main(){
    int num = 5;
    //int a[][3] = {{1,2,3},{4,5,6},{7,8,9}};//注意int**和int (*)[]的区别,int (*)[]是指向数组的指针，数组首址不可变
    int **a = (int **)malloc(num*sizeof(int *));
    for(int i = 0;i < num;i++){
        a[i] = (int *)malloc(num*sizeof(int));
        for(int j = 0;j < num;j++){
            a[i][j] = num*i + j + 1;
            printf("%d ",a[i][j]);
        }
        printf("\n");
    }
    rotate(a,num,num);
    for(int i = 0;i < num;i++){
        for(int j = 0;j < num;j++)
            printf("%d ",a[i][j]);
        printf("\n");
    }
}