Commit 40a2e51

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+54

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+54

-27

lines changed

Lines changed: 22 additions & 11 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,16 +1,27 @@`
	`1`	`+/**`
	`2`	`+ * Definition for singly-linked list.`
	`3`	`+ * public class ListNode {`
	`4`	`+ * int val;`
	`5`	`+ * ListNode next;`
	`6`	`+ * ListNode(int x) { val = x; }`
	`7`	`+ * }`
	`8`	`+ */`
`1`	`9`	`class Solution {`
`2`	`10`	`public ListNode mergeTwoLists(ListNode l1, ListNode l2) {`
`3`		`- if (l1 == null) {`
`4`		`- return l2;`
	`11`	`+ ListNode head = new ListNode(0);`
	`12`	`+ head.next = null;`
	`13`	`+ ListNode current = head;`
	`14`	`+ while (l1 != null && l2 != null) {`
	`15`	`+ if (l1.val <= l2.val) {`
	`16`	`+ current.next = l1;`
	`17`	`+ l1 = l1.next;`
	`18`	`+ } else {`
	`19`	`+ current.next = l2;`
	`20`	`+ l2 = l2.next;`
	`21`	`+ }`
	`22`	`+ current = current.next;`
`5`	`23`	`}`
`6`		`- if (l2 == null) {`
`7`		`- return l1;`
`8`		`- }`
`9`		`- if (l1.val < l2.val) {`
`10`		`- l1.next = mergeTwoLists(l1.next, l2);`
`11`		`- return l1;`
`12`		`- }`
`13`		`- l2.next = mergeTwoLists(l1, l2.next);`
`14`		`- return l2;`
	`24`	`+ current.next = l1 != null ? l1 : l2;`
	`25`	`+ return head.next;`
`15`	`26`	`}`
`16`	`27`	`}`

Lines changed: 26 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,26 @@`
	`1`	`+/**`
	`2`	`+ * Definition for singly-linked list.`
	`3`	`+ * public class ListNode {`
	`4`	`+ * int val;`
	`5`	`+ * ListNode next;`
	`6`	`+ * ListNode(int x) { val = x; }`
	`7`	`+ * }`
	`8`	`+ */`
	`9`	`+class Solution {`
	`10`	`+ public ListNode reverseList(ListNode head) {`
	`11`	`+ if (head == null) return null;`
	`12`	`+ ListNode reverse = null;`
	`13`	`+ while (head != null) {`
	`14`	`+ ListNode temp = head;`
	`15`	`+ head = head.next;`
	`16`	`+ if (reverse == null) {`
	`17`	`+ reverse = temp;`
	`18`	`+ temp.next = null;`
	`19`	`+ } else {`
	`20`	`+ temp.next = reverse;`
	`21`	`+ reverse = temp;`
	`22`	`+ }`
	`23`	`+ }`
	`24`	`+ return reverse;`
	`25`	`+ }`
	`26`	`+}`

Lines changed: 6 additions & 16 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,18 +1,8 @@`
`1`		`-class Solution {`
`2`		`- public ListNode middleNode(ListNode head) {`
`3`		`- if (head == null \|\| head.next == null) {`
`4`		`- return head;`
`5`		`- }`
`6`		`- ListNode fast = head;`
`7`		`- ListNode slow = head;`
`8`		`- while (fast.next != null) {`
`9`		`- // 快指针每次循环走两步,慢指针走一步`
`10`		`- fast = fast.next.next;`
`11`		`- slow = slow.next;`
`12`		`- if (fast == null \|\| fast.next == null) {`
`13`		`- return slow;`
`14`		`- }`
`15`		`- }`
`16`		`- return null;`
	`1`	`+public ListNode middleNode(ListNode head) {`
	`2`	`+ ListNode low = head, first = head;`
	`3`	`+ while (first != null && first.next != null) {`
	`4`	`+ low = low.next;`
	`5`	`+ first = first.next.next;`
`17`	`6`	`}`
	`7`	`+ return low;`
`18`	`8`	`}`

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