1161-1170

1161. Maximum Level Sum of a Binary Tree $\star\star$

1162. As Far from Land as Possible $\star\star$

1163. Last Substring in Lexicographical Order $\star\star\star$

1164. Product Price at a Given Date $\star\star$

1165. Single-Row Keyboard $\star$

1166. Design File System $\star\star$

1167. Minimum Cost to Connect Sticks $\star\star$

1168. Optimize Water Distribution in a Village $\star\star\star$

1169. Invalid Transactions $\star\star$

1170. Compare Strings by Frequency of the Smallest Character $\star$