Start a timer whenever a user loads a problem at Leetcode.com
Modify line number 17 to either var option = 1; or var option = 2;.
option = 1: The time starts from the moment you open a problem url and continues forever.
option = 2: The time starts from 0 every time you open a problem url and continues only till the window is open. Every time you reload the window the timer will restart from 0.
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