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52 lines
616 B
Go
52 lines
616 B
Go
package mathutils
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func Min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func Max(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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func Abs(a int) int {
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if a < 0 {
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return -a
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}
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return a
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}
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func NCk(n int, k int) float64 {
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// http://blog.plover.com/math/choose.html
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if k > n {
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return 0
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}
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if k == 0 {
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return 1
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}
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r := float64(1)
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for d := 1; d <= k; d++ {
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r *= float64(n)
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r /= float64(d)
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n--
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}
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return r
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}
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func Factorial(n int) float64 {
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// unoptimized, called only on small n
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if n < 2 {
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return 1
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}
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f := float64(1)
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for i := 2; i <= n; i++ {
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f *= float64(i)
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}
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return f
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}
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