算法链表合并

# iteratively def mergeTwoLists1(self, l1, l2): dummy = cur = ListNode(0) while l1 and l2: if l1.val < l2.val: cur.next = l1 l1 = l1.next else: cur.next = l2 l2 = l2.next cur = cur.next cur.next = l1 or l2 return dummy.next # recursively def mergeTwoLists2(self, l1, l2): if not l1 or not l2: return l1 or l2 if l1.val < l2.val: l1.next = self.mergeTwoLists(l1.next, l2) return l1 else: l2.next = self.mergeTwoLists(l1, l2.next) return l2 # in-place, iteratively def mergeTwoLists(self, l1, l2): if None in (l1, l2): return l1 or l2 dummy = cur = ListNode(0) dummy.next = l1 while l1 and l2: if l1.val < l2.val: l1 = l1.next else: nxt = cur.next cur.next = l2 tmp = l2.next l2.next = nxt l2 = tmp cur = cur.next cur.next = l1 or l2 return dummy.next http://www.cnblogs.com/qieerbushejinshikelou/p/3917302.html

https://segmentfault.com/a/1190000003718892

https://leetcode.com/problemset/algorithms/