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leetcode 2 Add two numbers
分类：leetcode
<span style="font-size:14px;">/** * Definition for singly-linked list. * struct ListNode { *int val; *ListNode *next; *ListNode(int x) : val(x), next(NULL) {} * }; */class Solution {public:ListNode* addTwoNumbers(ListNode* l1, ListNode* l2){if(l1 == NULL )return l2;if(l2 == NULL )return l1;if(l1 == NULL && l2 == NULL )return NULL;ListNode * head = NULL;ListNode * preo = NULL;int Y = 0;while( l1 && l2 ){int tmp = l1->val + l2->val + Y;Y=tmp/10;int Val=tmp%10;ListNode* Node = new ListNode(tmp);Y= Node->val / 10;Node->val %= 10;if(head == NULL)head = Node;elsepreo->next = Node;preo = Node;l1=l1->next;l2=l2->next;}while(l1){int tmp = l1->val+Y;Y=tmp/10;int Val = tmp%10;ListNode* Node = new ListNode(Val);if( head == NULL )head = Node;elsepreo->next = Node;preo = Node;l1=l1->next;}while(l2){int tmp = l2->val+Y;Y=tmp/10;int Val = tmp%10;ListNode* Node = new ListNode(Val);if( head == NULL )head = Node;elsepreo->next = Node;preo = Node;l2=l2->next;}if(Y!=0){ListNode* Node = new ListNode(1);preo->next = Node;}return head;} };</span>
感触: 有指针操作时一定要小心 = 和 == , 我好粗心啊..
上一篇c++ multimap multiset
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