DontFearAlgorithms
diff --git a/‎README.md
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@@ -1226,7 +1226,7 @@
 |[78. Subsets](https://leetcode.com/problems/subsets)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0078.%20Subsets)| Medium | O(n^2)| O(n)||
 |[79. Word Search](https://leetcode.com/problems/word-search)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0079.%20Word%20Search)| Medium | O(n^2)| O(n^2)||
 |[80. Remove Duplicates from Sorted Array II](https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0080.%20Remove%20Duplicates%20from%20Sorted%20Array%20II)| Medium | O(n)| O(1||
-|[84. Largest Rectangle in Histogram](https://leetcode.com/problems/largest-rectangle-in-histogram)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0084.%20Largest%20Rectangle%20in%20Histogram)| Medium | O(n)| O(n)||
+|[84. Largest Rectangle in Histogram](https://leetcode.com/problems/largest-rectangle-in-histogram)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0084.%20Largest%20Rectangle%20in%20Histogram)| Medium | O(n)| O(n)|❤️|
 |[88. Merge Sorted Array](https://leetcode.com/problems/merge-sorted-array)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0088.%20Merge-Sorted-Array)| Easy | O(n)| O(1)|❤️|
 |[90. Subsets II](https://leetcode.com/problems/subsets-ii)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0090.%20Subsets%20II)| Medium | O(n^2)| O(n)||
 |[120. Triangle](https://leetcode.com/problems/triangle)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0120.%20Triangle)| Medium | O(n^2)| O(n)||
@@ -1250,9 +1250,9 @@
 |[766. Toeplitz Matrix](https://leetcode.com/problems/toeplitz-matrix)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0766.%20Toeplitz%20Matrix)| Easy | O(n)| O(1)||
 |[867. Transpose Matrix](https://leetcode.com/problems/transpose-matrix)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0867.%20Transpose%20Matrix)| Easy | O(n)| O(1)||
 |[891. Sum of Subsequence Widths](https://leetcode.com/problems/sum-of-subsequence-widths)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0891.%20Sum%20of%20Subsequence%20Widths)| Hard | O(n log n)| O(1)||
-|[907. Sum of Subarray Minimums](https://leetcode.com/problems/sum-of-subarray-minimums)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0907.%20Sum%20of%20Subarray%20Minimums)| Medium | O(n)| O(n)||
+|[907. Sum of Subarray Minimums](https://leetcode.com/problems/sum-of-subarray-minimums)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0907.%20Sum%20of%20Subarray%20Minimums)| Medium | O(n)| O(n)|❤️|
 |[922. Sort Array By Parity II](https://leetcode.com/problems/sum-of-subarray-minimums)| [Go]()| Medium | O(n)| O(1)||
-|[969. Pancake Sorting](https://leetcode.com/problems/pancake-sorting)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0969.%20Pancake%20Sorting)| Medium | O(n)| O(1)||
+|[969. Pancake Sorting](https://leetcode.com/problems/pancake-sorting)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0969.%20Pancake%20Sorting)| Medium | O(n)| O(1)|❤️|
 |[977. Squares of a Sorted Array](https://leetcode.com/problems/squares-of-a-sorted-array)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0977.%20Squares%20of%20a%20Sorted%20Array)| Easy | O(n)| O(1)||
 |-----------------------------------------------------------------|-------------|-------------| --------------------------| --------------------------|-------------|
 
@@ -1398,8 +1398,8 @@
 |[141. Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0141.%20Linked%20List%20Cycle)| Easy | O(n)| O(1)|❤️|
 |[142. Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0142.%20Linked%20List%20Cycle%20II)| Medium | O(n)| O(1)|❤️|
 |[143. Reorder List](https://leetcode.com/problems/reorder-list/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0143.%20Reorder%20List)| Medium | O(n)| O(1)|❤️|
-|[147. Insertion Sort List](https://leetcode.com/problems/insertion-sort-list/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0147.%20Insertion%20Sort%20List)| Medium | O(n)| O(1)||
-|[148. Sort List](https://leetcode.com/problems/sort-list/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0148.%20Sort%20List)| Medium | O(log n)| O(n)|❤️|
+|[147. Insertion Sort List](https://leetcode.com/problems/insertion-sort-list/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0147.%20Insertion%20Sort%20List)| Medium | O(n)| O(1)|❤️|
+|[148. Sort List](https://leetcode.com/problems/sort-list/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0148.%20Sort%20List)| Medium | O(n log n)| O(n)|❤️|
 |[160. Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0160.%20Intersection%20of%20Two%20Linked%20Lists)| Easy | O(n)| O(1)|❤️|
 |[203. Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0203.%20Remove%20Linked%20List%20Elements)| Easy | O(n)| O(1)||
 |[206. Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0206.%20Reverse-Linked-List)| Easy | O(n)| O(1)||
@@ -1420,13 +1420,17 @@
 
 ![](./Topics/Stack.png)
 
+- 括号匹配问题及类似问题。第 20 题，第 921 题，第 1021 题。
+- 栈的基本 pop 和 push 操作。第 71 题，第 150 题，第 155 题，第 224 题，第 225 题，第 232 题，第 946 题，第 1047 题。
+- 利用栈进行编码问题。第 394 题，第 682 题，第 856 题，第 880 题。
+- **单调栈**。**利用栈维护一个单调递增或者递减的下标数组**。第 84 题，第 456 题，第 496 题，第 503 题，第 739 题，第 901 题，第 907 题，第 1019 题。
 
 | Title | Solution | Difficulty | Time | Space |收藏| 
 | ----- | :--------: | :----------: | :----: | :-----: | :-----: |
 |[20. Valid Parentheses](https://leetcode.com/problems/valid-parentheses)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0020.%20Valid-Parentheses)| Easy | O(log n)| O(1)||
 |[42. Trapping Rain Water](https://leetcode.com/problems/trapping-rain-water)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0042.%20Trapping%20Rain%20Water)| Hard | O(n)| O(1)|❤️|
-|[71. Simplify Path](https://leetcode.com/problems/simplify-path)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0071.%20Simplify%20Path)| Medium | O(n)| O(n)||
-|[84. Largest Rectangle in Histogram](https://leetcode.com/problems/largest-rectangle-in-histogram)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0084.%20Largest%20Rectangle%20in%20Histogram)| Medium | O(n)| O(n)||
+|[71. Simplify Path](https://leetcode.com/problems/simplify-path)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0071.%20Simplify%20Path)| Medium | O(n)| O(n)|❤️|
+|[84. Largest Rectangle in Histogram](https://leetcode.com/problems/largest-rectangle-in-histogram)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0084.%20Largest%20Rectangle%20in%20Histogram)| Medium | O(n)| O(n)|❤️|
 |[94. Binary Tree Inorder Traversal](https://leetcode.com/problems/binary-tree-inorder-traversal)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0094.%20Binary%20Tree%20Inorder%20Traversal)| Medium | O(n)| O(1)||
 |[103. Binary Tree Zigzag Level Order Traversal](https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0103.%20Binary%20Tree%20Zigzag%20Level%20Order%20Traversal)| Medium | O(n)| O(n)||
 |[144. Binary Tree Preorder Traversal](https://leetcode.com/problems/binary-tree-preorder-traversal)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0144.%20Binary%20Tree%20Preorder%20Traversal)| Medium | O(n)| O(1)||
@@ -1445,15 +1449,15 @@
 |[503. Next Greater Element II](https://leetcode.com/problems/next-greater-element-ii)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0503.%20Next%20Greater%20Element%20II)| Medium | O(n)| O(n)||
 |[636. Exclusive Time of Functions](https://leetcode.com/problems/exclusive-time-of-functions)| [Go](https://leetcode.com/problems/exclusive-time-of-functions)| Medium | O(n)| O(n)||
 |[682. Baseball Game](https://leetcode.com/problems/baseball-game)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0682.%20Baseball%20Game)| Easy | O(n)| O(n)||
-|[726. Number of Atoms](https://leetcode.com/problems/number-of-atoms)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0726.%20Number%20of%20Atoms)| Hard | O(n)| O(n) ||
+|[726. Number of Atoms](https://leetcode.com/problems/number-of-atoms)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0726.%20Number%20of%20Atoms)| Hard | O(n)| O(n) |❤️|
 |[735. Asteroid Collision](https://leetcode.com/problems/asteroid-collision)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0735.%20Asteroid%20Collision)| Medium | O(n)| O(n) ||
 |[739. Daily Temperatures](https://leetcode.com/problems/daily-temperatures)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0739.%20Daily%20Temperatures)| Medium | O(n)| O(n) ||
 |[844. Backspace String Compare](https://leetcode.com/problems/backspace-string-compare)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0844.%20Backspace%20String%20Compare)| Easy | O(n)| O(n) ||
 |[856. Score of Parentheses](https://leetcode.com/problems/score-of-parentheses)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0856.%20Score%20of%20Parentheses)| Medium | O(n)| O(n)||
 |[880. Decoded String at Index](https://leetcode.com/problems/decoded-string-at-index)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0880.%20Decoded%20String%20at%20Index)| Medium | O(n)| O(n)||
 |[895. Maximum Frequency Stack](https://leetcode.com/problems/maximum-frequency-stack)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0895.%20Maximum%20Frequency%20Stack)| Hard | O(n)| O(n)  ||
 |[901. Online Stock Span](https://leetcode.com/problems/online-stock-span)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0901.%20Online%20Stock%20Span)| Medium | O(n)| O(n)  ||
-|[907. Sum of Subarray Minimums](https://leetcode.com/problems/sum-of-subarray-minimums)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0907.%20Sum%20of%20Subarray%20Minimums)| Medium | O(n)| O(n)||
+|[907. Sum of Subarray Minimums](https://leetcode.com/problems/sum-of-subarray-minimums)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0907.%20Sum%20of%20Subarray%20Minimums)| Medium | O(n)| O(n)|❤️|
 |[921. Minimum Add to Make Parentheses Valid](https://leetcode.com/problems/minimum-add-to-make-parentheses-valid)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0921.%20Minimum%20Add%20to%20Make%20Parentheses%20Valid)| Medium | O(n)| O(n)||
 |[946. Validate Stack Sequences](https://leetcode.com/problems/validate-stack-sequences)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0946.%20Validate%20Stack%20Sequences)| Medium | O(n)| O(n)||
 |[1003. Check If Word Is Valid After Substitutions](https://leetcode.com/problems/check-if-word-is-valid-after-substitutions)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/1003.%20Check%20If%20Word%20Is%20Valid%20After%20Substitutions)| Medium | O(n)| O(1)||
@@ -1705,7 +1709,7 @@
 |[648. Replace Words](https://leetcode.com/problems/replace-words)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0648.%20Replace%20Words)| Medium | O(n)| O(n) ||
 |[676. Implement Magic Dictionary](https://leetcode.com/problems/implement-magic-dictionary)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0676.%20Implement%20Magic%20Dictionary)| Medium | O(n)| O(n) ||<
8000
/span>
 |[720. Longest Word in Dictionary](https://leetcode.com/problems/longest-word-in-dictionary)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0720.%20Longest%20Word%20in%20Dictionary)| Easy | O(n)| O(n) ||
-|[726. Number of Atoms](https://leetcode.com/problems/number-of-atoms)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0726.%20Number%20of%20Atoms)| Hard | O(n)| O(n) ||
+|[726. Number of Atoms](https://leetcode.com/problems/number-of-atoms)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0726.%20Number%20of%20Atoms)| Hard | O(n)| O(n) |❤️|
 |[739. Daily Temperatures](https://leetcode.com/problems/daily-temperatures)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0739.%20Daily%20Temperatures)| Medium | O(n)| O(n) ||
 |[710. Random Pick with Blacklist](https://leetcode.com/problems/random-pick-with-blacklist/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0710.%20Random%20Pick%20with%20Blacklist)| Hard | O(n)| O(n)  ||
 |[895. Maximum Frequency Stack](https://leetcode.com/problems/maximum-frequency-stack)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0895.%20Maximum%20Frequency%20Stack)| Hard | O(n)| O(n)  ||
@@ -1750,7 +1754,7 @@
 |[973. K Closest Points to Origin](https://leetcode.com/problems/k-closest-points-to-origin/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0973.%20K%20Closest%20Points%20to%20Origin)| Medium | O(n log n)| O(log n) ||
 |[976. Largest Perimeter Triangle](https://leetcode.com/problems/largest-perimeter-triangle/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/0976.%20Largest%20Perimeter%20Triangle)| Easy | O(n log n)| O(log n) ||
 |[1030. Matrix Cells in Distance Order](https://leetcode.com/problems/matrix-cells-in-distance-order/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/1030.%20Matrix%20Cells%20in%20Distance%20Order)| Easy | O(n^2)| O(1) ||
-|[1054. Distant Barcodes](https://leetcode.com/problems/distant-barcodes/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/1054.%20Distant%20Barcodes)| Medium | O(n log n)| O(log n) ||
+|[1054. Distant Barcodes](https://leetcode.com/problems/distant-barcodes/)| [Go](https://github.com/halfrost/LeetCode-Go/tree/master/Algorithms/1054.%20Distant%20Barcodes)| Medium | O(n log n)| O(log n) |❤️|
 |-----------------------------------------------------------------|-------------|-------------| --------------------------| --------------------------|-------------|