Update README.md

Author: rajatag03

README.md

@@ -2,9 +2,9 @@
 
 # April Leetcoding Challenge 2021
 
-Day | Name of Problem | Leetcode Link | Video Link 
---- | :---: | :---: | --- 
-1 | Palindrome Linked List | https://leetcode.com/problems/palindrome-linked-list/ | https://youtu.be/Ll9ZbXaXqlQ 
+Day | Name of Problem | Leetcode Link | Video Link
+--- | :---: | --- | ---
+1 | Palindrome Linked List | https://leetcode.com/problems/palindrome-linked-list/ | https://youtu.be/Ll9ZbXaXqlQ
 2 | Ones and Zeroes | https://leetcode.com/problems/ones-and-zeroes/ | https://youtu.be/qkUZ87NCYSw
 3 | Longest Valid Parentheses | https://leetcode.com/problems/longest-valid-parentheses/ | https://youtu.be/VdQuwtEd10M
 4 | Design Circular Queue | https://leetcode.com/problems/design-circular-queue/ | https://youtu.be/Q2YhZ6Pq0GQ
@@ -13,3 +13,6 @@ Day | Name of Problem | Leetcode Link | Video Link
 7 | Determine if String Halves Are Alike | https://leetcode.com/problems/determine-if-string-halves-are-alike/ | https://youtu.be/752uISt9sCs
 8 | Letter Combinations of a Phone Number | https://leetcode.com/problems/letter-combinations-of-a-phone-number/ | https://youtu.be/Ydur1aYALc4
 9 | Verifying an Alien Dictionary | https://leetcode.com/problems/verifying-an-alien-dictionary/ | https://youtu.be/jK5a8T9q4pc
+10 | Deepest Leaves Sum | https://leetcode.com/problems/deepest-leaves-sum/ | https://youtu.be/kgG2LuxzAHU
+11 | Longest Increasing Path in a Matrix | https://leetcode.com/problems/longest-increasing-path-in-a-matrix/ | https://youtu.be/WiEqhI7v2FY
+12 | Beautiful Arrangement II | https://leetcode.com/problems/beautiful-arrangement-ii/ | https://youtu.be/jK5a8T9q4pc