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lines changed Original file line number Diff line number Diff line change
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+ /* *
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+ * Definition for singly-linked list.
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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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+ */
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+ class Solution {
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+ public:
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+ ListNode* mergeTwoLists (ListNode* list1, ListNode* list2) {
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+ if (list1 == nullptr )return list2;
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+ if (list2 == nullptr )return list1;
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+
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+ // always list1 <= list2
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+ if (list1->val > list2->val ){
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+ swap (list1, list2);
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+ }
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+
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+ ListNode* ret = list1;
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+ list1 = list1->next ;
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+
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+ ListNode *current = ret;
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+
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+ while (list1 != nullptr && list2 != nullptr ){
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+ // always list1 <= list2
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+ if (list1->val > list2->val ){
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+ swap (list1, list2);
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+ }
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+
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+ current->next = list1;
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+ list1 = list1->next ;
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+
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+ current = current->next ;
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+ }
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+
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+ if (list1 == nullptr ){
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+ current->next = list2;
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+ return ret;
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+ }
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+
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+ if (list2 == nullptr ){
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+ current->next = list1;
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+ return ret;
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+ }
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+
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+ return ret;
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+ }
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+ };
Original file line number Diff line number Diff line change
1
+ /* *
2
+ * Definition for singly-linked list.
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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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+ */
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+ class Solution {
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+ public:
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+ ListNode* mergeTwoLists (ListNode* list1, ListNode* list2) {
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+ ListNode ret = ListNode ();
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+ ListNode *current = &ret;
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+
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+ while (list1 != nullptr && list2 != nullptr ){
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+ if (list1->val > list2->val ){
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+ swap (list1, list2);
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+ }
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+
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+ current->next = list1;
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+ current = current->next ;
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+ list1 = list1->next ;
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+ }
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+
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+ if (list1 == nullptr ){
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+ current->next = list2;
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+ }
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+ if (list2 == nullptr ){
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+ current->next = list1;
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+ }
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+
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+ return ret.next ;
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+ }
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+ };
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