Created
May 15, 2019 01:21
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| 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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