Merge branch 'master' into patch-1

Author: halfrost

README.md

@@ -24,10 +24,8 @@
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@@ -62,23 +60,23 @@
 
 * [Array](#array)
 * [String](#string)
-* [Two Pointers ✅](#two-pointers)
-* [Linked List ✅](#linked-list)
-* [Stack ✅](#stack)
+* [✅ Two Pointers](#two-pointers)
+* [✅ Linked List](#linked-list)
+* [✅ Stack](#stack)
 * [Tree](#tree)
 * [Dynamic programming](#dynamic-programming)
-* [Backtracking ✅](#backtracking)
+* [✅ Backtracking](#backtracking)
 * [Depth First Search](#depth-first-search)
 * [Breadth First Search](#breadth-first-search)
 * [Binary Search](#binary-search)
 * [Math](#math)
 * [Hash Table](#hash-table)
-* [Sort ✅](#sort)
-* [Bit Manipulation ✅](#bit-manipulation)
-* [Union Find ✅](#union-find)
-* [Sliding Window ✅](#sliding-window)
-* [Segment Tree ✅](#segment-tree)
-* [Binary Indexed Tree ✅](#binary-indexed-tree)
+* [✅ Sort](#sort)
+* [✅ Bit Manipulation](#bit-manipulation)
+* [✅ Union Find](#union-find)
+* [✅ Sliding Window](#sliding-window)
+* [✅ Segment Tree](#segment-tree)
+* [✅ Binary Indexed Tree](#binary-indexed-tree)
 
 | 数据结构 | 变种 | 相关题目 | 讲解文章 | 
 |:-------:|:-------|:------|:------|