2019-04-25 18:24:51 +08:00
|
|
|
|
<!-- GFM-TOC -->
|
|
|
|
|
* [20. 表示数值的字符串](#20-表示数值的字符串)
|
|
|
|
|
* [21. 调整数组顺序使奇数位于偶数前面](#21-调整数组顺序使奇数位于偶数前面)
|
|
|
|
|
* [22. 链表中倒数第 K 个结点](#22-链表中倒数第-k-个结点)
|
|
|
|
|
* [23. 链表中环的入口结点](#23-链表中环的入口结点)
|
|
|
|
|
* [24. 反转链表](#24-反转链表)
|
|
|
|
|
* [25. 合并两个排序的链表](#25-合并两个排序的链表)
|
|
|
|
|
* [26. 树的子结构](#26-树的子结构)
|
|
|
|
|
* [27. 二叉树的镜像](#27-二叉树的镜像)
|
|
|
|
|
* [28 对称的二叉树](#28-对称的二叉树)
|
|
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|
|
* [29. 顺时针打印矩阵](#29-顺时针打印矩阵)
|
|
|
|
|
<!-- GFM-TOC -->
|
|
|
|
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|
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|
|
# 20. 表示数值的字符串
|
|
|
|
|
|
2019-10-17 02:15:15 +08:00
|
|
|
|
[NowCoder](https://www.nowcoder.com/practice/6f8c901d091949a5837e24bb82a731f2?tpId=13&tqId=11206&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 题目描述
|
|
|
|
|
|
2019-05-03 20:13:26 +08:00
|
|
|
|
```
|
2019-04-25 18:24:51 +08:00
|
|
|
|
true
|
|
|
|
|
|
|
|
|
|
"+100"
|
|
|
|
|
"5e2"
|
|
|
|
|
"-123"
|
|
|
|
|
"3.1416"
|
|
|
|
|
"-1E-16"
|
2019-05-03 20:13:26 +08:00
|
|
|
|
```
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
2019-05-03 20:13:26 +08:00
|
|
|
|
```
|
2019-04-25 18:24:51 +08:00
|
|
|
|
false
|
|
|
|
|
|
|
|
|
|
"12e"
|
|
|
|
|
"1a3.14"
|
|
|
|
|
"1.2.3"
|
|
|
|
|
"+-5"
|
|
|
|
|
"12e+4.3"
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## 解题思路
|
|
|
|
|
|
|
|
|
|
使用正则表达式进行匹配。
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
[] : 字符集合
|
|
|
|
|
() : 分组
|
2019-05-03 20:13:26 +08:00
|
|
|
|
? : 重复 0 ~ 1 次
|
|
|
|
|
+ : 重复 1 ~ n 次
|
|
|
|
|
* : 重复 0 ~ n 次
|
2019-04-25 18:24:51 +08:00
|
|
|
|
. : 任意字符
|
|
|
|
|
\\. : 转义后的 .
|
|
|
|
|
\\d : 数字
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
```java
|
|
|
|
|
public boolean isNumeric(char[] str) {
|
|
|
|
|
if (str == null || str.length == 0)
|
|
|
|
|
return false;
|
|
|
|
|
return new String(str).matches("[+-]?\\d*(\\.\\d+)?([eE][+-]?\\d+)?");
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
# 21. 调整数组顺序使奇数位于偶数前面
|
|
|
|
|
|
2019-10-17 02:15:15 +08:00
|
|
|
|
[NowCoder](https://www.nowcoder.com/practice/beb5aa231adc45b2a5dcc5b62c93f593?tpId=13&tqId=11166&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 题目描述
|
|
|
|
|
|
|
|
|
|
需要保证奇数和奇数,偶数和偶数之间的相对位置不变,这和书本不太一样。
|
|
|
|
|
|
2019-04-25 18:43:33 +08:00
|
|
|
|
<div align="center"> <img src="pics/d03a2efa-ef19-4c96-97e8-ff61df8061d3.png" width="200px"> </div><br>
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 解题思路
|
|
|
|
|
|
2019-05-03 20:13:26 +08:00
|
|
|
|
方法一:创建一个新数组,时间复杂度 O(N),空间复杂度 O(N)。
|
|
|
|
|
|
2019-04-25 18:24:51 +08:00
|
|
|
|
```java
|
|
|
|
|
public void reOrderArray(int[] nums) {
|
|
|
|
|
// 奇数个数
|
|
|
|
|
int oddCnt = 0;
|
2019-05-03 20:13:26 +08:00
|
|
|
|
for (int x : nums)
|
|
|
|
|
if (!isEven(x))
|
2019-04-25 18:24:51 +08:00
|
|
|
|
oddCnt++;
|
|
|
|
|
int[] copy = nums.clone();
|
|
|
|
|
int i = 0, j = oddCnt;
|
|
|
|
|
for (int num : copy) {
|
|
|
|
|
if (num % 2 == 1)
|
|
|
|
|
nums[i++] = num;
|
|
|
|
|
else
|
|
|
|
|
nums[j++] = num;
|
|
|
|
|
}
|
|
|
|
|
}
|
2019-05-03 20:13:26 +08:00
|
|
|
|
|
|
|
|
|
private boolean isEven(int x) {
|
|
|
|
|
return x % 2 == 0;
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
方法二:使用冒泡思想,每次都当前偶数上浮到当前最右边。时间复杂度 O(N<sup>2</sup>),空间复杂度 O(1),时间换空间。
|
|
|
|
|
|
|
|
|
|
```java
|
|
|
|
|
public void reOrderArray(int[] nums) {
|
|
|
|
|
int N = nums.length;
|
|
|
|
|
for (int i = N - 1; i > 0; i--) {
|
|
|
|
|
for (int j = 0; j < i; j++) {
|
|
|
|
|
if (isEven(nums[j]) && !isEven(nums[j + 1])) {
|
|
|
|
|
swap(nums, j, j + 1);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private boolean isEven(int x) {
|
|
|
|
|
return x % 2 == 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private void swap(int[] nums, int i, int j) {
|
|
|
|
|
int t = nums[i];
|
|
|
|
|
nums[i] = nums[j];
|
|
|
|
|
nums[j] = t;
|
|
|
|
|
}
|
2019-04-25 18:24:51 +08:00
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
# 22. 链表中倒数第 K 个结点
|
|
|
|
|
|
2019-10-17 02:15:15 +08:00
|
|
|
|
[NowCoder](https://www.nowcoder.com/practice/529d3ae5a407492994ad2a246518148a?tpId=13&tqId=11167&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 解题思路
|
|
|
|
|
|
2019-05-03 20:13:26 +08:00
|
|
|
|
设链表的长度为 N。设置两个指针 P1 和 P2,先让 P1 移动 K 个节点,则还有 N - K 个节点可以移动。此时让 P1 和 P2 同时移动,可以知道当 P1 移动到链表结尾时,P2 移动到第 N - K 个节点处,该位置就是倒数第 K 个节点。
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
2019-04-25 18:43:33 +08:00
|
|
|
|
<div align="center"> <img src="pics/6b504f1f-bf76-4aab-a146-a9c7a58c2029.png" width="500"/> </div><br>
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
```java
|
|
|
|
|
public ListNode FindKthToTail(ListNode head, int k) {
|
|
|
|
|
if (head == null)
|
|
|
|
|
return null;
|
|
|
|
|
ListNode P1 = head;
|
|
|
|
|
while (P1 != null && k-- > 0)
|
|
|
|
|
P1 = P1.next;
|
|
|
|
|
if (k > 0)
|
|
|
|
|
return null;
|
|
|
|
|
ListNode P2 = head;
|
|
|
|
|
while (P1 != null) {
|
|
|
|
|
P1 = P1.next;
|
|
|
|
|
P2 = P2.next;
|
|
|
|
|
}
|
|
|
|
|
return P2;
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
# 23. 链表中环的入口结点
|
|
|
|
|
|
2019-10-17 02:15:15 +08:00
|
|
|
|
[NowCoder](https://www.nowcoder.com/practice/253d2c59ec3e4bc68da16833f79a38e4?tpId=13&tqId=11208&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 题目描述
|
|
|
|
|
|
|
|
|
|
一个链表中包含环,请找出该链表的环的入口结点。要求不能使用额外的空间。
|
|
|
|
|
|
|
|
|
|
## 解题思路
|
|
|
|
|
|
|
|
|
|
使用双指针,一个指针 fast 每次移动两个节点,一个指针 slow 每次移动一个节点。因为存在环,所以两个指针必定相遇在环中的某个节点上。假设相遇点在下图的 z1 位置,此时 fast 移动的节点数为 x+2y+z,slow 为 x+y,由于 fast 速度比 slow 快一倍,因此 x+2y+z=2(x+y),得到 x=z。
|
|
|
|
|
|
|
|
|
|
在相遇点,slow 要到环的入口点还需要移动 z 个节点,如果让 fast 重新从头开始移动,并且速度变为每次移动一个节点,那么它到环入口点还需要移动 x 个节点。在上面已经推导出 x=z,因此 fast 和 slow 将在环入口点相遇。
|
|
|
|
|
|
2019-04-25 18:43:33 +08:00
|
|
|
|
<div align="center"> <img src="pics/bb7fc182-98c2-4860-8ea3-630e27a5f29f.png" width="500"/> </div><br>
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
```java
|
|
|
|
|
public ListNode EntryNodeOfLoop(ListNode pHead) {
|
|
|
|
|
if (pHead == null || pHead.next == null)
|
|
|
|
|
return null;
|
|
|
|
|
ListNode slow = pHead, fast = pHead;
|
|
|
|
|
do {
|
|
|
|
|
fast = fast.next.next;
|
|
|
|
|
slow = slow.next;
|
|
|
|
|
} while (slow != fast);
|
|
|
|
|
fast = pHead;
|
|
|
|
|
while (slow != fast) {
|
|
|
|
|
slow = slow.next;
|
|
|
|
|
fast = fast.next;
|
|
|
|
|
}
|
|
|
|
|
return slow;
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
# 24. 反转链表
|
|
|
|
|
|
2019-10-17 02:15:15 +08:00
|
|
|
|
[NowCoder](https://www.nowcoder.com/practice/75e878df47f24fdc9dc3e400ec6058ca?tpId=13&tqId=11168&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 解题思路
|
|
|
|
|
|
|
|
|
|
### 递归
|
|
|
|
|
|
|
|
|
|
```java
|
|
|
|
|
public ListNode ReverseList(ListNode head) {
|
|
|
|
|
if (head == null || head.next == null)
|
|
|
|
|
return head;
|
|
|
|
|
ListNode next = head.next;
|
|
|
|
|
head.next = null;
|
|
|
|
|
ListNode newHead = ReverseList(next);
|
|
|
|
|
next.next = head;
|
|
|
|
|
return newHead;
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
### 迭代
|
|
|
|
|
|
2019-05-03 20:13:26 +08:00
|
|
|
|
使用头插法。
|
|
|
|
|
|
2019-04-25 18:24:51 +08:00
|
|
|
|
```java
|
|
|
|
|
public ListNode ReverseList(ListNode head) {
|
|
|
|
|
ListNode newList = new ListNode(-1);
|
|
|
|
|
while (head != null) {
|
|
|
|
|
ListNode next = head.next;
|
|
|
|
|
head.next = newList.next;
|
|
|
|
|
newList.next = head;
|
|
|
|
|
head = next;
|
|
|
|
|
}
|
|
|
|
|
return newList.next;
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
# 25. 合并两个排序的链表
|
|
|
|
|
|
2019-10-17 02:15:15 +08:00
|
|
|
|
[NowCoder](https://www.nowcoder.com/practice/d8b6b4358f774294a89de2a6ac4d9337?tpId=13&tqId=11169&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 题目描述
|
|
|
|
|
|
2019-04-25 18:43:33 +08:00
|
|
|
|
<div align="center"> <img src="pics/c094d2bc-ec75-444b-af77-d369dfb6b3b4.png" width="400"/> </div><br>
|
2019-04-25 18:24:51 +08:00
|
|
|
|
|
|
|
|
|
## 解题思路
|
|
|
|
|
|
|
|
|
|
### 递归
|
|
|
|
|
|
|
|
|
|
```java
|
|
|
|
|
public ListNode Merge(ListNode list1, ListNode list2) {
|
|
|
|
|
if (list1 == null)
|
|
|
|
|
return list2;
|
|
|
|
|
if (list2 == null)
|
|
|
|
|
return list1;
|
|
|
|
|
if (list1.val <= list2.val) {
|
|
|
|
|
list1.next = Merge(list1.next, list2);
|
|
|
|
|
return list1;
|
|
|
|
|
} else {
|
|
|
|
|
list2.next = Merge(list1, list2.next);
|
|
|
|
|
return list2;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
### 迭代
|
|
|
|
|
|
|
|
|
|
```java
|
|
|
|
|
public ListNode Merge(ListNode list1, ListNode list2) {
|
|
|
|
|
ListNode head = new ListNode(-1);
|
|
|
|
|
ListNode cur = head;
|
|
|
|
|
while (list1 != null && list2 != null) {
|
|
|
|
|
if (list1.val <= list2.val) {
|
|
|
|
|
cur.next = list1;
|
|
|
|
|
list1 = list1.next;
|
|
|
|
|
} else {
|
|
|
|
|
cur.next = list2;
|
|
|
|
|
list2 = list2.next;
|
|
|
|
|
}
|
|
|
|
|
cur = cur.next;
|
|
|
|
|
}
|
|
|
|
|
if (list1 != null)
|
|
|
|
|
cur.next = list1;
|
|
|
|
|
if (list2 != null)
|
|
|
|
|
cur.next = list2;
|
|
|
|
|
return head.next;
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
# 26. 树的子结构
|
|
|
|
|
|
2019-10-17 02:15:15 +08:00
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[NowCoder](https://www.nowcoder.com/practice/6e196c44c7004d15b1610b9afca8bd88?tpId=13&tqId=11170&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
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2019-04-25 18:24:51 +08:00
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## 题目描述
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2019-04-25 18:43:33 +08:00
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<div align="center"> <img src="pics/84a5b15a-86c5-4d8e-9439-d9fd5a4699a1.jpg" width="450"/> </div><br>
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2019-04-25 18:24:51 +08:00
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## 解题思路
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```java
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public boolean HasSubtree(TreeNode root1, TreeNode root2) {
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if (root1 == null || root2 == null)
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return false;
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return isSubtreeWithRoot(root1, root2) || HasSubtree(root1.left, root2) || HasSubtree(root1.right, root2);
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}
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private boolean isSubtreeWithRoot(TreeNode root1, TreeNode root2) {
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if (root2 == null)
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return true;
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if (root1 == null)
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return false;
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if (root1.val != root2.val)
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return false;
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return isSubtreeWithRoot(root1.left, root2.left) && isSubtreeWithRoot(root1.right, root2.right);
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}
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```
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# 27. 二叉树的镜像
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2019-10-17 02:15:15 +08:00
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[NowCoder](https://www.nowcoder.com/practice/564f4c26aa584921bc75623e48ca3011?tpId=13&tqId=11171&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
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2019-04-25 18:24:51 +08:00
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## 题目描述
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2019-04-25 18:43:33 +08:00
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<div align="center"> <img src="pics/0c12221f-729e-4c22-b0ba-0dfc909f8adf.jpg" width="300"/> </div><br>
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2019-04-25 18:24:51 +08:00
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## 解题思路
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```java
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public void Mirror(TreeNode root) {
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if (root == null)
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return;
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swap(root);
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Mirror(root.left);
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Mirror(root.right);
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}
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private void swap(TreeNode root) {
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TreeNode t = root.left;
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root.left = root.right;
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root.right = t;
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}
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```
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# 28 对称的二叉树
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2019-10-17 02:15:15 +08:00
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[NowCoder](https://www.nowcoder.com/practice/ff05d44dfdb04e1d83bdbdab320efbcb?tpId=13&tqId=11211&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
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2019-04-25 18:24:51 +08:00
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## 题目描述
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2019-04-25 18:43:33 +08:00
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<div align="center"> <img src="pics/0c12221f-729e-4c22-b0ba-0dfc909f8adf.jpg" width="300"/> </div><br>
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2019-04-25 18:24:51 +08:00
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## 解题思路
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```java
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boolean isSymmetrical(TreeNode pRoot) {
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if (pRoot == null)
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return true;
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return isSymmetrical(pRoot.left, pRoot.right);
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}
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boolean isSymmetrical(TreeNode t1, TreeNode t2) {
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if (t1 == null && t2 == null)
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return true;
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if (t1 == null || t2 == null)
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return false;
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if (t1.val != t2.val)
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return false;
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return isSymmetrical(t1.left, t2.right) && isSymmetrical(t1.right, t2.left);
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}
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```
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# 29. 顺时针打印矩阵
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2019-10-17 02:15:15 +08:00
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[NowCoder](https://www.nowcoder.com/practice/9b4c81a02cd34f76be2659fa0d54342a?tpId=13&tqId=11172&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
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2019-04-25 18:24:51 +08:00
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## 题目描述
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下图的矩阵顺时针打印结果为:1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10
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2019-04-25 18:43:33 +08:00
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<div align="center"> <img src="pics/48517227-324c-4664-bd26-a2d2cffe2bfe.png" width="200px"> </div><br>
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2019-04-25 18:24:51 +08:00
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## 解题思路
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```java
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public ArrayList<Integer> printMatrix(int[][] matrix) {
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ArrayList<Integer> ret = new ArrayList<>();
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int r1 = 0, r2 = matrix.length - 1, c1 = 0, c2 = matrix[0].length - 1;
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while (r1 <= r2 && c1 <= c2) {
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for (int i = c1; i <= c2; i++)
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ret.add(matrix[r1][i]);
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for (int i = r1 + 1; i <= r2; i++)
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ret.add(matrix[i][c2]);
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if (r1 != r2)
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for (int i = c2 - 1; i >= c1; i--)
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ret.add(matrix[r2][i]);
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if (c1 != c2)
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for (int i = r2 - 1; i > r1; i--)
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ret.add(matrix[i][c1]);
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r1++; r2--; c1++; c2--;
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}
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return ret;
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}
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```
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2019-06-13 13:31:54 +08:00
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# 微信公众号
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2019-06-10 11:23:18 +08:00
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2019-06-18 00:57:23 +08:00
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更多精彩内容将发布在微信公众号 CyC2018 上,你也可以在公众号后台和我交流学习和求职相关的问题。另外,公众号提供了该项目的 PDF 等离线阅读版本,后台回复 "下载" 即可领取。公众号也提供了一份技术面试复习大纲,不仅系统整理了面试知识点,而且标注了各个知识点的重要程度,从而帮你理清多而杂的面试知识点,后台回复 "大纲" 即可领取。我基本是按照这个大纲来进行复习的,对我拿到了 BAT 头条等 Offer 起到很大的帮助。你们完全可以和我一样根据大纲上列的知识点来进行复习,就不用看很多不重要的内容,也可以知道哪些内容很重要从而多安排一些复习时间。
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2019-06-10 11:23:18 +08:00
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2019-10-18 02:46:26 +08:00
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<br><div align="center"><img width="510px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/githubio/公众号海报7.png"></img></div>
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