Mind palace

12-22

204. Count Primes

12-22

155. Min Stack

12-20

1168. Optimize Water Distribution in a Village

12-20

157. Read N Characters Given Read4

12-17

688. Knight Probability in Chessboard

12-13

727. Minimum Window Subsequence

12-13

127. Word Ladder

12-13

417. Pacific Atlantic Water Flow

12-13

253. Meeting Rooms II

12-13

227. Basic Calculator II