力扣 轮转数组三段逆置法和三段拷贝法（C语言）

void reverse(int* arr, int left, int right)
{
  while (left < right)
  {
    int tmp = arr[left];
    arr[left] = arr[right];
    arr[right] = tmp;
    left++;
    right--;
  }
}
void rotate(int* nums, int numsSize, int k) 
{
   k%=numsSize;
   reverse(nums, 0, numsSize-k-1);
   reverse(nums, numsSize-k, numsSize-1);
   reverse(nums, 0, numsSize-1);
}

void rotate(int* nums, int numsSize, int k) 
{  k%=numsSize;
   int nums1[numsSize];
  memcpy(nums1,nums+numsSize-k,sizeof(int)*k);
  memcpy(nums1+k,nums,sizeof(int)*(numsSize-k));
  memcpy(nums,nums1,sizeof(int)*(numsSize));
}