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nitrix/gist:7bd0750bc89b2ef15c9c199f05de8b56

Created May 15, 2019 01:21
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gistfile1.txt
func triangularNumberOf(n int) int {
return n * (n + 1) / 2
}
func reverseTriangularNumberOf(sum int) int {
n := (math.Sqrt(8 * float64(sum) + 1) - 1) / 2
return int(math.Ceil(n))
}
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