【leetcode】滑动窗口的最大值

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int* maxSlidingWindow(int* nums, int numsSize, int k, int* returnSize){
    if (nums == NULL || numsSize == 0){
        *returnSize = 0;//传参检查
        return NULL;
    }
    *returnSize = numsSize - k + 1;
    if (k <= 1)
        return nums;
    int* arr = (int*)malloc(sizeof(int)**returnSize);
    for (int i=0; i<*returnSize; i++ )
    {
        int max = nums[i];
        for (int j=i+1; j<i+k; j++)
        {
            if (nums[j] > max)
                max = nums[j];
        }
        arr[i] = max;
    }

    return arr;
}