From 91a707eca6ae63fa4bbd253c8d0f540f18b73032 Mon Sep 17 00:00:00 2001
From: CyC2018 <zhengyc101@163.com>
Date: Fri, 3 May 2019 16:32:21 +0800
Subject: [PATCH] auto commit

---
 docs/notes/剑指 Offer 题解 - 10~19.md           |  16 +++++++++++++++-
 .../508c6e52-9f93-44ed-b6b9-e69050e14807.jpg    | Bin 0 -> 10166 bytes
 .../db85a909-5e11-48b2-85d2-f003e7bb35c0.png    | Bin 0 -> 2660 bytes
 .../fec3ba89-115a-4cf9-b165-756757644641.png    | Bin 0 -> 1194 bytes
 .../508c6e52-9f93-44ed-b6b9-e69050e14807.jpg    | Bin 0 -> 10166 bytes
 .../db85a909-5e11-48b2-85d2-f003e7bb35c0.png    | Bin 0 -> 2660 bytes
 .../fec3ba89-115a-4cf9-b165-756757644641.png    | Bin 0 -> 1194 bytes
 notes/剑指 Offer 题解 - 10~19.md                |  16 +++++++++++++++-
 8 files changed, 30 insertions(+), 2 deletions(-)
 create mode 100644 docs/pics/508c6e52-9f93-44ed-b6b9-e69050e14807.jpg
 create mode 100644 docs/pics/db85a909-5e11-48b2-85d2-f003e7bb35c0.png
 create mode 100644 docs/pics/fec3ba89-115a-4cf9-b165-756757644641.png
 create mode 100644 notes/pics/508c6e52-9f93-44ed-b6b9-e69050e14807.jpg
 create mode 100644 notes/pics/db85a909-5e11-48b2-85d2-f003e7bb35c0.png
 create mode 100644 notes/pics/fec3ba89-115a-4cf9-b165-756757644641.png

diff --git a/docs/notes/剑指 Offer 题解 - 10~19.md b/docs/notes/剑指 Offer 题解 - 10~19.md
index 598ad80e..f913b5da 100644
--- a/docs/notes/剑指 Offer 题解 - 10~19.md	
+++ b/docs/notes/剑指 Offer 题解 - 10~19.md	
@@ -65,7 +65,7 @@ public int Fibonacci(int n) {
 }
 ```
 
-由于待求解的 n 小于 40，因此可以将前 40 项的结果先进行计算，之后就能以 O(1) 时间复杂度得到第 n 项的值了。
+由于待求解的 n 小于 40，因此可以将前 40 项的结果先进行计算，之后就能以 O(1) 时间复杂度得到第 n 项的值。
 
 ```java
 public class Solution {
@@ -96,6 +96,20 @@ public class Solution {
 
 ## 解题思路
 
+当 n 为 1 时，只有一种覆盖方法：
+
+<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/fec3ba89-115a-4cf9-b165-756757644641.png" width="100px"> </div><br>
+
+当 n 为 2 时，有两种覆盖方法：
+
+<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/db85a909-5e11-48b2-85d2-f003e7bb35c0.png" width="200px"> </div><br>
+
+要覆盖 2\*n 的大矩形，可以先覆盖 2\*1 的矩形，再覆盖 2\*(n-1) 的矩形；或者先覆盖 2\*2 的矩形，再覆盖 2\*(n-2) 的矩形。而覆盖 2\*(n-1) 和 2\*(n-2) 的矩形可以看成子问题。该问题的递推公式如下：
+
+<!-- <div align="center"><img src="https://latex.codecogs.com/gif.latex?f(n)=\left\{\begin{array}{rcl}1&&{n=1}\\2&&{n=2}\\f(n-1)+f(n-2)&&{n>1}\end{array}\right." class="mathjax-pic"/></div> <br> -->
+
+<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/508c6e52-9f93-44ed-b6b9-e69050e14807.jpg" width="350px"> </div><br>
+
 ```java
 public int RectCover(int n) {
     if (n <= 2)
diff --git a/docs/pics/508c6e52-9f93-44ed-b6b9-e69050e14807.jpg b/docs/pics/508c6e52-9f93-44ed-b6b9-e69050e14807.jpg
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diff --git a/notes/剑指 Offer 题解 - 10~19.md b/notes/剑指 Offer 题解 - 10~19.md
index 4a5b7c1e..741289f7 100644
--- a/notes/剑指 Offer 题解 - 10~19.md	
+++ b/notes/剑指 Offer 题解 - 10~19.md	
@@ -65,7 +65,7 @@ public int Fibonacci(int n) {
 }
 ```
 
-由于待求解的 n 小于 40，因此可以将前 40 项的结果先进行计算，之后就能以 O(1) 时间复杂度得到第 n 项的值了。
+由于待求解的 n 小于 40，因此可以将前 40 项的结果先进行计算，之后就能以 O(1) 时间复杂度得到第 n 项的值。
 
 ```java
 public class Solution {
@@ -96,6 +96,20 @@ public class Solution {
 
 ## 解题思路
 
+当 n 为 1 时，只有一种覆盖方法：
+
+<div align="center"> <img src="pics/fec3ba89-115a-4cf9-b165-756757644641.png" width="100px"> </div><br>
+
+当 n 为 2 时，有两种覆盖方法：
+
+<div align="center"> <img src="pics/db85a909-5e11-48b2-85d2-f003e7bb35c0.png" width="200px"> </div><br>
+
+要覆盖 2\*n 的大矩形，可以先覆盖 2\*1 的矩形，再覆盖 2\*(n-1) 的矩形；或者先覆盖 2\*2 的矩形，再覆盖 2\*(n-2) 的矩形。而覆盖 2\*(n-1) 和 2\*(n-2) 的矩形可以看成子问题。该问题的递推公式如下：
+
+<!-- <div align="center"><img src="https://latex.codecogs.com/gif.latex?f(n)=\left\{\begin{array}{rcl}1&&{n=1}\\2&&{n=2}\\f(n-1)+f(n-2)&&{n>1}\end{array}\right." class="mathjax-pic"/></div> <br> -->
+
+<div align="center"> <img src="pics/508c6e52-9f93-44ed-b6b9-e69050e14807.jpg" width="350px"> </div><br>
+
 ```java
 public int RectCover(int n) {
     if (n <= 2)