Q1. Find Closest Person (contest 445) Open

414. Third Maximum Number Open

268. Missing Number Open

136. Single Number Open

500. Keyboard Row Open

485. Max Consecutive Ones Open

1456. Maximum Number of Vowels in a Substring of Given Length Open

1838. Frequency of the Most Frequent Element Open

567. Permutation in String Open

904. Fruit Into Baskets Open

219. Contains Duplicate II Open

121. Best Time to Buy and Sell Stock Open

1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold Open

424. Longest Repeating Character Replacement Open

3208. Alternating Groups II Open

3. Longest Substring Without Repeating Characters Open

2379. Minimum Recolors to Get K Consecutive Black Blocks Open

1052. Grumpy Bookstore Owner Open