diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index c913d03..71646ec 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,103 +1,14 @@
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-    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1581954879452" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1581954956837" />
     <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>
     <state x="100" y="100" width="1240" height="700" key="com.intellij.history.integration.ui.views.DirectoryHistoryDialog/0.23.1440.797@0.23.1440.797" timestamp="1581744794182" />
-    <state x="378" y="207" width="683" height="486" key="find.popup" timestamp="1581952168076">
+    <state x="378" y="207" width="683" height="486" key="find.popup" timestamp="1581956166048">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="378" y="207" width="683" height="486" key="find.popup/0.0.1440.900@0.0.1440.900" timestamp="1581952168076" />
+    <state x="378" y="207" width="683" height="486" key="find.popup/0.0.1440.900@0.0.1440.900" timestamp="1581956166048" />
     <state x="385" y="210" key="run.anything.popup" timestamp="1581652493432">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
diff --git a/README.md b/README.md
index e85c079..34f36a2 100644
--- a/README.md
+++ b/README.md
@@ -8,51 +8,77 @@
 
 ### 链表操作
 
-q2,q206,
+* [q2_两数相加](/src/链表操作/q2_两数相加)
+* [q206_反转链表](/src/链表操作/q206_反转链表)
 
 ### 双指针遍历
 
-q3,q11,q15,q16,q26,q42,q121,q209,
+* [q3_无重复字符的最长子串](/src/双指针遍历/q3_无重复字符的最长子串)
+* [q11_盛最多水的容器](/src/双指针遍历/q11_盛最多水的容器)
+* [q15_三数之和](/src/双指针遍历/q15_三数之和)
+* [q16_最接近的三数之和](/src/双指针遍历/q16_最接近的三数之和)
+* [q26_删除排序数组中的重复项](/src/双指针遍历/q26_删除排序数组中的重复项)
+* [q42_接雨水](/src/双指针遍历/q42_接雨水)
+* [q121_买卖股票的最佳时机](/src/双指针遍历/q121_买卖股票的最佳时机)
+* [q209_长度最小的子数组](/src/双指针遍历/q209_长度最小的子数组)
 
 ### 字符串操作
 
-q6,q14,
+* [q6_Z字形变换](/src/字符串操作/q6_Z字形变换)
+* [q14_最长公共前缀](/src/字符串操作/q14_最长公共前缀)
 
 ### 数字操作
 
-q7,q8,q9,q43,q172,
+* [q7_整数反转](/src/数字操作/q7_整数反转)
+* [q8_字符串转换整数](/src/数字操作/q8_字符串转换整数)
+* [q9_回文数](/src/数字操作/q9_回文数)
+* [q43_字符串相乘](/src/数字操作/q43_字符串相乘)
+* [q172_阶乘后的零](/src/数字操作/q172_阶乘后的零)
 
 ### 数组操作
 
-q54,
+* [q54_螺旋矩阵](/src/数组操作/q54_螺旋矩阵)
 
 ### 栈操作
 
-q20,
+* [q20_有效的括号](/src/栈操作/q20_有效的括号)
 
 ### 递归
 
-q21,q101,q236,
+* [q21_合并两个有序链表](/src/递归/q21_合并两个有序链表)
+* [q101_对称二叉树](/src/递归/q101_对称二叉树)
+* [q236_二叉树的最近公共祖先](/src/递归/q236_二叉树的最近公共祖先)
 
 ### 分治法/二分法
 
-q23,q33,
+* [q23_合并K个排序链表](/src/分治法/q23_合并K个排序链表)
+* [q33_搜索旋转排序数组](/src/分治法/q33_搜索旋转排序数组)
 
 ### 动态规划
 
-q5,q53,q746,q1277,
+* [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)
+* [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)
 
 ### 回溯法
 
-q10,q22,q46,
+* [q10_正则表达式匹配](/src/回溯法/q10_正则表达式匹配)
+* [q22_括号生成](/src/回溯法/q22_括号生成)
+* [q46_全排列](/src/回溯法/q46_全排列)
 
 ### 树的遍历
 
-q94,q110,q144,q145,
+* [q94_二叉树的中序遍历](/src/树的遍历/q94_二叉树的中序遍历)
+* [q110_平衡二叉树](/src/树的遍历/q110_平衡二叉树)
+* [q144_二叉树的前序遍历](/src/树的遍历/q144_二叉树的前序遍历)
+* [q145_二叉树的后序遍历](/src/树的遍历/q145_二叉树的后序遍历)
 
 ### 二叉搜索树相关
 
-q98,q450,q701,
+* [q98_验证二叉搜索树](/src/二叉搜索树相关/q98_验证二叉搜索树)
+* [q450_删除二叉搜索树中的节点](/src/二叉搜索树相关/q450_删除二叉搜索树中的节点)
+* [q701_二叉搜索树中的插入操作](/src/二叉搜索树相关/q701_二叉搜索树中的插入操作)
 
 -------
 
diff --git a/src/动态规划/q53_最大子序和/q1/Solution.java b/src/动态规划/q53_最大子序和/f1/Solution.java
similarity index 94%
rename from src/动态规划/q53_最大子序和/q1/Solution.java
rename to src/动态规划/q53_最大子序和/f1/Solution.java
index 79a7910..cfb52bf 100644
--- a/src/动态规划/q53_最大子序和/q1/Solution.java
+++ b/src/动态规划/q53_最大子序和/f1/Solution.java
@@ -1,4 +1,4 @@
-package 动态规划.q53_最大子序和.q1;
+package 动态规划.q53_最大子序和.f1;
 
 /**
  * 贪心法 遍历一次 o(n)
diff --git a/src/动态规划/q53_最大子序和/q2/Solution.java b/src/动态规划/q53_最大子序和/f2/Solution.java
similarity index 92%
rename from src/动态规划/q53_最大子序和/q2/Solution.java
rename to src/动态规划/q53_最大子序和/f2/Solution.java
index b40bbbd..569cbc3 100644
--- a/src/动态规划/q53_最大子序和/q2/Solution.java
+++ b/src/动态规划/q53_最大子序和/f2/Solution.java
@@ -1,4 +1,4 @@
-package 动态规划.q53_最大子序和.q2;
+package 动态规划.q53_最大子序和.f2;
 
 /**
  * 动态规划 dp[i]表示以nums[i]结尾的最大子序和 o(n)
diff --git a/src/树的遍历/q110_平衡二叉树/q1/Solution.java b/src/树的遍历/q110_平衡二叉树/f1/Solution.java
similarity index 95%
rename from src/树的遍历/q110_平衡二叉树/q1/Solution.java
rename to src/树的遍历/q110_平衡二叉树/f1/Solution.java
index d68baaf..b868ebe 100644
--- a/src/树的遍历/q110_平衡二叉树/q1/Solution.java
+++ b/src/树的遍历/q110_平衡二叉树/f1/Solution.java
@@ -1,4 +1,4 @@
-package 树的遍历.q110_平衡二叉树.q1;
+package 树的遍历.q110_平衡二叉树.f1;
 
 /**
  * 从顶至底遍历 o(n^2)
diff --git a/src/树的遍历/q110_平衡二叉树/q2/TreeNode.java b/src/树的遍历/q110_平衡二叉树/f1/TreeNode.java
similarity index 73%
rename from src/树的遍历/q110_平衡二叉树/q2/TreeNode.java
rename to src/树的遍历/q110_平衡二叉树/f1/TreeNode.java
index 345f17c..573d0ac 100644
--- a/src/树的遍历/q110_平衡二叉树/q2/TreeNode.java
+++ b/src/树的遍历/q110_平衡二叉树/f1/TreeNode.java
@@ -1,4 +1,4 @@
-package 树的遍历.q110_平衡二叉树.q2;
+package 树的遍历.q110_平衡二叉树.f1;
 
 public class TreeNode {
     int val;
diff --git a/src/树的遍历/q110_平衡二叉树/q2/Solution.java b/src/树的遍历/q110_平衡二叉树/f2/Solution.java
similarity index 91%
rename from src/树的遍历/q110_平衡二叉树/q2/Solution.java
rename to src/树的遍历/q110_平衡二叉树/f2/Solution.java
index ab3e435..3f28c1d 100644
--- a/src/树的遍历/q110_平衡二叉树/q2/Solution.java
+++ b/src/树的遍历/q110_平衡二叉树/f2/Solution.java
@@ -1,4 +1,4 @@
-package 树的遍历.q110_平衡二叉树.q2;
+package 树的遍历.q110_平衡二叉树.f2;
 
 /**
  * 从底至顶遍历 o(n)
diff --git a/src/树的遍历/q110_平衡二叉树/q1/TreeNode.java b/src/树的遍历/q110_平衡二叉树/f2/TreeNode.java
similarity index 73%
rename from src/树的遍历/q110_平衡二叉树/q1/TreeNode.java
rename to src/树的遍历/q110_平衡二叉树/f2/TreeNode.java
index 5ea9e32..1f395f2 100644
--- a/src/树的遍历/q110_平衡二叉树/q1/TreeNode.java
+++ b/src/树的遍历/q110_平衡二叉树/f2/TreeNode.java
@@ -1,4 +1,4 @@
-package 树的遍历.q110_平衡二叉树.q1;
+package 树的遍历.q110_平衡二叉树.f2;
 
 public class TreeNode {
     int val;