00:00-4:05 intro
4:06-5:11 Problem 1(Question 1)
5:12-6:32 Problem 1(Question 2)
6:33-7:38 Problem 1(Question 3)
7:39-8:55 Problem 1(Question 4)
8:56-10:10 Problem 1(Question 5)
10:11-14:19 Problem 1(Question 6)
14:20-17:04 Problem 1(Question 7)
17:05-20:33 Problem 1(Question 8)
20:34-23:17 Problem 1(Question 9)
23:18-28:46 Problem 1(Question 10)
28:47 -32:41 Problem 2(Question 1)
32:42 -36:35 Problem 2 (Question 2)
36:36 -40:43 Problem 2(Question 3)
40:44 - 43:35 Problem 2(Question 4)
43:36 - 50:56 Problem 2(Question 5)
50:57 -54:42 Problem 3(Question 1)
54:43- 1:00:08 Problem 3(Question 2 )
1:00:09 -1:03:39 Problem 3( Question 3)
1:03:40 -1:05:43 Problem 3(Question 4)
1:05:44 - 1:08:51 Problem 3(Question 5)
