diff options
Diffstat (limited to 'other/swap_nodes_pairs.cpp')
-rw-r--r-- | other/swap_nodes_pairs.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/other/swap_nodes_pairs.cpp b/other/swap_nodes_pairs.cpp new file mode 100644 index 0000000..139c336 --- /dev/null +++ b/other/swap_nodes_pairs.cpp @@ -0,0 +1,21 @@ +// 24. Swap Nodes in Pairs +#include "leetcode.h" + +/* + * given a linked list, swap every two adjacent nodes and return + * its head. problem must be solved without modifying values + * in the list's nodes (ie only nodes themselves may be changed) + */ + +class Solution { +public: + ListNode *swapPairs(ListNode *head) { + if (!head || !head->next) + return head; + ListNode *tmp; + tmp = head->next; + head->next = swapPairs(head->next->next); + tmp->next = head; + return tmp; + } +}; |