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README.md

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 * [Microsoft](#microsoft)
 
 ## Progress
-[Problem Status](#problem-status) shows the latest progress to all 400+ questions. Currently we have 207 completed solutions. Note: questions with ♥ mark means that you have to **Subscript to premium membership** of LeetCode to unlock them. Thank you for great contributions from [CharleneJiang](https://github.com/CharleneJiang), [ReadmeCritic](https://github.com/ReadmeCritic), [demonkoo](https://github.com/demonkoo), [DaiYue](https://github.com/DaiYue), [Quaggie](https://github.com/Quaggie) and [jindulys](https://github.com/jindulys).
+[Problem Status](#problem-status) shows the latest progress to all 400+ questions. Currently we have 208 completed solutions. Note: questions with ♥ mark means that you have to **Subscript to premium membership** of LeetCode to unlock them. Thank you for great contributions from [CharleneJiang](https://github.com/CharleneJiang), [ReadmeCritic](https://github.com/ReadmeCritic), [demonkoo](https://github.com/demonkoo), [DaiYue](https://github.com/DaiYue), [Quaggie](https://github.com/Quaggie) and [jindulys](https://github.com/jindulys).
 
 
 ## Array
@@ -200,6 +200,7 @@
 [N-Queens II](https://leetcode.com/problems/n-queens-ii/)| [Swift](./DFS/NQueensII.swift)| Hard| O((n^3))| O(n)|
 [Sudoku Solver](https://leetcode.com/problems/sudoku-solver/)| [Swift](./DFS/SudokuSolver.swift)| Hard| O(n^4)| O(1)|
 [Remove Invalid Parentheses](https://leetcode.com/problems/remove-invalid-parentheses/)| [Swift](./DFS/RemoveInvalidParentheses.swift)| Hard| O(n!)| O(n)|
+[Expression Add Operators](https://leetcode.com/problems/expression-add-operators/)| [Swift](./DFS/ExpressionAddOperators.swift)| Hard| O(n!)| O(n)|
 
 ## Math
 | Title | Solution | Difficulty | Time | Space |
@@ -293,6 +294,7 @@
 | ----- | -------- | ---------- | --------- |
 [3Sum](https://leetcode.com/problems/3sum/)| [Swift](./Array/ThreeSum.swift)| Medium| ★★★★★★|
 [Move Zeroes](https://leetcode.com/problems/move-zeroes/)| [Swift](./Array/MoveZeroes.swift)| Easy| ★★★★★★|
+[Remove Invalid Parentheses](https://leetcode.com/problems/remove-invalid-parentheses/)| [Swift](./DFS/RemoveInvalidParentheses.swift)| Hard| ★★★★★★|
 [Add Binary](https://leetcode.com/problems/add-binary/)| [Swift](./Math/AddBinary.swift)| Easy| ★★★★★|
 [Two Sum](https://leetcode.com/problems/two-sum/)| [Swift](./Array/TwoSum.swift)| Easy| ★★★★★|
 [Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/)| [Swift](./DFS/LetterCombinationsPhoneNumber.swift)| Medium| ★★★★|
@@ -301,6 +303,7 @@
 [Merge Intervals](https://leetcode.com/problems/merge-intervals/)| [Swift](./Sort/MergeIntervals.swift)| Hard| ★★★|
 [Number of Islands](https://leetcode.com/problems/number-of-islands/)| [Swift](./DFS/NumberofIslands.swift)| Medium| ★★★|
 [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/)| [Swift](./LinkedList/ReverseLinkedList.swift)| Easy| ★★★|
+[Expression Add Operators](https://leetcode.com/problems/expression-add-operators/)| [Swift](./DFS/ExpressionAddOperators.swift)| Hard| ★★★|
 [Subsets](https://leetcode.com/problems/subsets/)| [Swift](./DFS/Subsets.swift)| Medium| ★★★|
 [Sort Colors](https://leetcode.com/problems/sort-colors/)| [Swift](./Sort/SortColors.swift)| Medium| ★★|
 
@@ -486,7 +489,7 @@
 |		|	285	|	[Inorder Successor in BST](https://leetcode.com/problems/inorder-successor-in-bst/) ♥	|	Medium	|
 |		|	284	|	[Peeking Iterator](https://leetcode.com/problems/peeking-iterator/)	|	Medium	|
 |	[Swift](./Array/MoveZeroes.swift)	|	283	|	[Move Zeroes](https://leetcode.com/problems/move-zeroes/)	| Easy	|
-|		|	282	|	[Expression Add Operators](https://leetcode.com/problems/expression-add-operators/)	|	Hard	|
+|	[Swift](./DFS/ExpressionAddOperators.swift)	|	282	|	[Expression Add Operators](https://leetcode.com/problems/expression-add-operators/)	|	Hard	|
 |		|	281	|	[Zigzag Iterator](https://leetcode.com/problems/zigzag-iterator/) ♥	|	Medium	|
 |	[Swift](./Sort/WiggleSort.swift)	|	280	|	[Wiggle Sort](https://leetcode.com/problems/wiggle-sort/) ♥	|	Medium	|
 |	[Swift](./DP/PerfectSquares.swift)	|	279	|	[Perfect Squares](https://leetcode.com/problems/perfect-squares/)	|	Medium	|