C++中链表报错member access within null pointer of type 'ListNode'

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leetcode 编译问题：Line x: member access within null pointer of type 'struct TreeNode'

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141. 环形链表 LeetCode报错:runtime error: member access within null pointer of type 'struct ListNode'

/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: bool hasCycle(ListNode *head) { if(!head->next||!head) return false; ListNode *pre=NU…

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member access within misaligned address 0x0000002c3931 for type 'struct ListNode‘

From MWeb 在做leetcode 第2题时使用C语言编写链表时报错错误复现错误原因解决办法错误复现报错时的代码如下 /** * Definition for singly-linked list. * struct ListNode { * int val; * struct ListNode *next; * }; */ struct ListNode* addTwoNumbers(struct ListNode* l1, struct ListNode* l2) { if(…

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Protected Member Access

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