35 lines
627 B
Go
35 lines
627 B
Go
package utilities
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type Permutable interface {
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~int | ~int8 | ~int16 | ~int32 | ~int64 | ~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64
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}
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func GetPermutations[T Permutable](arr ...T) [][]T {
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var helper func([]T, int)
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res := [][]T{}
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helper = func(arr []T, n int) {
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if n == 1 {
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tmp := make([]T, len(arr))
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copy(tmp, arr)
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res = append(res, tmp)
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} else {
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for i := 0; i < n; i++ {
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helper(arr, n-1)
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if n%2 == 1 {
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tmp := arr[i]
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arr[i] = arr[n-1]
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arr[n-1] = tmp
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} else {
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tmp := arr[0]
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arr[0] = arr[n-1]
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arr[n-1] = tmp
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}
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}
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}
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}
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helper(arr, len(arr))
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return res
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}
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