leetcode/include/s0024_swap_nodes_in_pairs.hpp

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#ifndef S0024_SWAP_NODES_IN_PAIRS_HPP
#define S0024_SWAP_NODES_IN_PAIRS_HPP
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struct ListNode {
int val;
ListNode* next;
ListNode() : val(0), next(nullptr) {}
ListNode(int x) : val(x), next(nullptr) {}
ListNode(int x, ListNode* next) : val(x), next(next) {}
};
class Solution {
public:
ListNode* swapPairs(ListNode* head);
};
#endif