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light must be off at the end. solution in Clear category for Lightbulb End Watching by lolucky
var sumLight =(T,s,e)=>
(T.length%2 ? [...T,e] : T).reduce((a,v,i)=>
a + (i%2 ? 1 : -1)*(ve?e:v).getTime(), 0)/1000
Jan. 26, 2021
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