diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 4f3f6d0..ed8aae4 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="add q316">
-      <change afterPath="$PROJECT_DIR$/src/递归/q226_翻转二叉树/Solution.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/递归/q226_翻转二叉树/TreeNode.java" afterDir="false" />
+    <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
+      <change afterPath="$PROJECT_DIR$/src/动态规划/q300_最长上升子序列/Solution.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
     </list>
@@ -283,7 +282,9 @@
       <workItem from="1583244406273" duration="200000" />
       <workItem from="1583480518824" duration="4257000" />
       <workItem from="1583497707004" duration="210000" />
-      <workItem from="1583849488567" duration="658000" />
+      <workItem from="1583849488567" duration="869000" />
+      <workItem from="1583927904095" duration="1482000" />
+      <workItem from="1584281287922" duration="2034000" />
     </task>
     <task id="LOCAL-00001" summary="add q5/q7/q172">
       <created>1580045439607</created>
@@ -614,7 +615,14 @@
       <option name="project" value="LOCAL" />
       <updated>1583497819094</updated>
     </task>
-    <option name="localTasksCounter" value="48" />
+    <task id="LOCAL-00048" summary="add q226">
+      <created>1583851879205</created>
+      <option name="number" value="00048" />
+      <option name="presentableId" value="LOCAL-00048" />
+      <option name="project" value="LOCAL" />
+      <updated>1583851879205</updated>
+    </task>
+    <option name="localTasksCounter" value="49" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -667,7 +675,6 @@
     </option>
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="add q54" />
     <MESSAGE value="add q23/q101" />
     <MESSAGE value="add q94/98/144/145" />
     <MESSAGE value="update q98" />
@@ -692,7 +699,8 @@
     <MESSAGE value="add q56" />
     <MESSAGE value="add q215/q347" />
     <MESSAGE value="add q316" />
-    <option name="LAST_COMMIT_MESSAGE" value="add q316" />
+    <MESSAGE value="add q226" />
+    <option name="LAST_COMMIT_MESSAGE" value="add q226" />
   </component>
   <component name="WindowStateProjectService">
     <state x="320" y="115" key="#Inspections" timestamp="1581061018990">
@@ -707,10 +715,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="533" y="166" key="#com.intellij.ide.util.MemberChooser/0.0.1440.900@0.0.1440.900" timestamp="1578548165321" />
-    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1583851362092">
+    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1584289852645">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1583851362092" />
+    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1584289852645" />
     <state x="144" y="78" width="1152" height="720" key="DiffContextDialog" timestamp="1582971909377">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
@@ -765,10 +773,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="221" y="63" key="SettingsEditor/0.0.1440.900@0.0.1440.900" timestamp="1583244442349" />
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1583497821216">
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1583851880820">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1583497821216" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1583851880820" />
     <state x="100" y="100" width="1240" height="700" key="com.intellij.history.integration.ui.views.DirectoryHistoryDialog" timestamp="1581744794182">
       <screen x="0" y="23" width="1440" height="797" />
     </state>
diff --git a/README.md b/README.md
index 987624d..34ccf4c 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,7 @@
 * [q5_最长回文子串](/src/动态规划/q5_最长回文子串)
 * [q53_最大子序和](/src/动态规划/q53_最大子序和)
 * [q118_杨辉三角](/src/动态规划/q118_杨辉三角)
+* [q300_最长上升子序列](/src/动态规划/q300_最长上升子序列)
 * [q746_使用最小花费爬楼梯](/src/动态规划/q746_使用最小花费爬楼梯)
 * [q1277_统计全为1的正方形子矩阵](/src/动态规划/q1277_统计全为1的正方形子矩阵)
 
diff --git a/src/动态规划/q300_最长上升子序列/Solution.java b/src/动态规划/q300_最长上升子序列/Solution.java
new file mode 100644
index 0000000..4378551
--- /dev/null
+++ b/src/动态规划/q300_最长上升子序列/Solution.java
@@ -0,0 +1,36 @@
+package 动态规划.q300_最长上升子序列;
+
+/**
+ * 动态规划 dp[i]表示以i索引下标结束的最长上升子序列 o(n*log(n))
+ */
+public class Solution {
+
+    public int lengthOfLIS(int[] nums) {
+        if (nums == null || nums.length == 0) {
+            return 0;
+        }
+
+        if (nums.length == 1) {
+            return 1;
+        }
+
+        int n = nums.length;
+        int[] dp = new int[n];
+        int rs = 0;
+
+        for (int i = 0; i < n; i++) {
+            dp[i] = 1;
+            int max = 0;
+            for (int j = i - 1; j >= 0; j--) {
+                if (nums[j] < nums[i] && dp[j] > max) {
+                    max = dp[j];
+                }
+            }
+            dp[i] += max;
+            if (dp[i] > rs) {
+                rs = dp[i];
+            }
+        }
+        return rs;
+    }
+}