s0024
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include/s0024_swap_nodes_in_pairs.hpp
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include/s0024_swap_nodes_in_pairs.hpp
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#ifndef S0024_SWAP_NODES_IN_PAIRS
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#define S0024_SWAP_NODES_IN_PAIRS
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struct ListNode {
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int val;
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ListNode* next;
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ListNode() : val(0), next(nullptr) {}
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ListNode(int x) : val(x), next(nullptr) {}
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ListNode(int x, ListNode* next) : val(x), next(next) {}
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};
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class Solution {
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public:
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ListNode* swapPairs(ListNode* head);
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};
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#endif
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src/s0024_swap_nodes_in_pairs.cpp
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src/s0024_swap_nodes_in_pairs.cpp
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#include "s0024_swap_nodes_in_pairs.hpp"
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ListNode* swapPairs(ListNode* head) {
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if (head == nullptr || head->next == nullptr) {
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return head;
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}
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ListNode *newHead = head->next;
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head->next = swapPairs(newHead->next);
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newHead->next = head;
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return newHead;
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}
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