30days_review_algorithm

sep 18 binary search

q33 q74 q69

1. complete tree and balanced tree:
   former is balanced but not complete. balanced should in the whole tree not each subtree
   

sep 19 binary search

*q287 q240 q275 q378 q387 q268

sep20 hashmap

q49 q451 q73

sep21 hashmap

q17 q128 q142 *q105

sep23 dp

q70 q118 q119 q121 q338