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leoromanovsky/contribution.scala

Created February 19, 2018 21:44
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contribution.scala
persons.flatMap(p => Seq((p.birthYear, 1), (p.deathYear, -1)))
.sorted
.foldLeft((0,0,0)){case ((mxYear,mxPop,curPop), (thisYear,dif)) =>
if (curPop+dif > mxPop) (thisYear, curPop+dif, curPop+dif)
else (mxYear, mxPop, curPop+dif)
}._1 //res0: Int = 2000
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