I attempted to explain my thought process of solving problems during this year's Facebook Hacker Cup Qualification Round! Thankfully, all of my solutions were correct in the end.
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0:00:00 Introduction
0:01:50 Problem A
0:12:49 Problem B
0:21:03 Problem C
0:35:06 Problem D1 - Thinking
0:41:52 Problem D2 - Thinking
0:54:26 Problem D1 & D2 - Implementing
1:21:37 Conclusion