| 917|[Reverse Only Letters](https://leetcode.com/problems/reverse-only-letters)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/917.%20Reverse%20Only%20Letters)|**O(n)**|**O(n)**| Easy|```String```|

| 921|[Minimum Add to Make Parentheses Valid](https://leetcode.com/problems/minimum-add-to-make-parentheses-valid)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/921.%20Minimum%20Add%20to%20Make%20Parentheses%20Valid)|**O(n)**|**O(n)**| Medium|```Stack, Greedy```|

| 922|[Sort Array By Parity II](https://leetcode.com/problems/sort-array-by-parity-ii)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/922.%20Sort%20Array%20By%20Parity%20II)|**O(n)**|**O(n)**| Easy|```Array, Sort```|

| 929|[Unique Email Addresses](https://leetcode.com/problems/unique-email-addresses)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/929.%20Unique%20Email%20Addresses)|**O(n)**|**O(n)**| Easy|```String```|

| 941|[Valid Mountain Array](https://leetcode.com/problems/valid-mountain-array)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/941.%20Valid%20Mountain%20Array)|**O(n)**|**O(1)**| Easy|```Array```|

| 944|[Delete Columns to Make Sorted](https://leetcode.com/problems/delete-columns-to-make-sorted)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/944.%20Delete%20Columns%20to%20Make%20Sorted)|**O(n)**|**O(1)**| Easy|```Greedy```|

| 950|[Reveal Cards In Increasing Order](https://leetcode.com/problems/reveal-cards-in-increasing-order)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/950.%20Reveal%20Cards%20In%20Increasing%20Order)|**O(n)**|**O(n)**| Medium|```Array```|

| 961|[N-Repeated Element in Size 2N Array](https://leetcode.com/problems/n-repeated-element-in-size-2n-array)|[Solution](https://github.com/Pratul1997/LeetCode/tree/master/Source%20Code/961.%20N-Repeated%20Element%20in%20Size%202N%20Array)|**O(n)**|**O(n)**| Easy|```Hash Table```|