背景:
在写一个
链表
相关的题目时犯的错误。
报错内容:
Line 70: Char 15: runtime error: member access within misaligned address 0xbebebebebebebebe for type 'struct ListNode', which requires 8 byte alignment (ListNode.c)
0xbebebebebebebebe: note: pointer points here
<memory cannot be printed>
错误原因:
申请空间之后,没有给结构体内的指针赋值。举例如下:
结构体定义:
struct ListNode {
int val;
struct ListNode *next;
错误写法(错误之处并不是语句错误,而是错在不完整):
struct ListNode * head = (struct ListNode *)malloc(sizeof(struct ListNode));
解决方法:如下(申请之后对结构体内的指针赋值,赋值为NULL
总没问题)
struct ListNode * head = (struct ListNode *)malloc(sizeof(struct ListNode));
head->next=NULL;
写在后面
写代码时要注意细节,要写得完整!切记!切记!
背景:在写一个 链表 相关的题目是犯的错误。报错内容:Line 70: Char 15: runtime error: member access within misaligned address 0xbebebebebebebebe for type 'struct ListNode', which requires 8 byte alignment (ListNode.c)0xbeb...
刷力扣时常犯的错:
runtime error: member access within misaligned address 0xbebebebebebebebe for type 'struct TreeNode', which requires 8 byte alignment [TreeNode.c]
0xbebebebebebebebe: note: pointer points here
runtime error: member access within misaligned address 0xbebebebebebebebe for type 'struct ListNode', which requires 8 byte alignment (ListNode.c)
0xbebebebebebebebe: note: pointer points here
这是为啥呢;因为没有赋初值
假设这么个结构体
struct ListN
Line 70: Char 15: runtime error: member access within misaligned address 0xbebebebebebebebe for type 'struct ListNode', which requires 8 byte alignment (ListNode.c)
0xbebebebeb..
runtime error: member access within misaligned address 0xbebebebebebebebe for type 'struct ListNode'
Line 70: Char 15: runtime error: member access within misaligned address 0xbebebebebebebebe for type 'struct ListNode', which requires 8 byte alignment (ListNode.c)
0xbebebebebebebebe: note: pointer p...
要求线性时间和空间,可以想到桶排序。首先遍历一遍数组,找到最大值和最小值,确定桶的大小和数量。将元素按照一定的规则放入桶中,然后在桶内寻找相邻元素之间的最大差值。
由于题目要求相邻元素之间的最大差值,因此可以将桶的大小设为 max(1, (max-min)/(n-1)),其中 n 为数组的长度,这样可以保证桶内相邻元素之间的差值不会超过桶的大小。
放入桶中的规则可以是:假设桶的数量为 n,那么第 i 个元素所在的桶的编号为 (num[i]-min) * n / (max-min),这样就可以保证相邻元素在同一个桶中,而不同的桶之间一定存在空桶。
放入桶中后,从左到右依次遍历桶,用当前桶的最小值减去前一个桶的最大值,得到相邻元素之间的差值,取最大值即可。
Python代码实现:
```python
class Solution:
def maximumGap(self, nums: List[int]) -> int:
n = len(nums)
if n < 2:
return 0
# 找到最大值和最小值
max_num, min_num = max(nums), min(nums)
# 计算桶的大小和数量
bucket_size = max(1, (max_num - min_num) // (n - 1))
bucket_num = (max_num - min_num) // bucket_size + 1
# 初始化桶
bucket = [[float('inf'), float('-inf')] for _ in range(bucket_num)]
for num in nums:
# 计算元素所在的桶的编号
idx = (num - min_num) // bucket_size
# 更新桶的最大值和最小值
bucket[idx][0] = min(bucket[idx][0], num)
bucket[idx][1] = max(bucket[idx][1], num)
# 遍历桶,计算相邻元素之间的最大差值
res, pre_max = 0, bucket[0][1]
for i in range(1, bucket_num):
if bucket[i][0] == float('inf'):
continue
res = max(res, bucket[i][0] -
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