Introduction
It is the weekly leetcode contest. I solved second and third algorithms, but the first algorithm is related to great common divisor, but somehow I did not get the idea. I tried over 20 minutes to think about a solution after one failed test case on the algorithm one.
There is a graph problem which is hard level, I did not have time to figure out the solution.
Progress report
My ranking is 1076/2579, score 11, finish time: 59:09. I could not score anything after the first hour.
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