Created
September 23, 2020 09:01
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package main | |
import ( | |
"fmt" | |
) | |
// tested on plaground at https://play.golang.org/p/j3fBcTmAx37 | |
// Permutation calls f with each permutation of a. | |
func Permutation(a []rune, f func([]rune)) { | |
perm(a, f, 0) | |
} | |
// Permute the values at index i to len(a)-1. | |
func perm(a []rune, f func([]rune), i int) { | |
if i > len(a) { | |
f(a) | |
return | |
} | |
perm(a, f, i+1) | |
for j := i + 1; j < len(a); j++ { | |
a[i], a[j] = a[j], a[i] | |
perm(a, f, i+1) | |
a[i], a[j] = a[j], a[i] | |
} | |
} | |
func main() { | |
Permutation([]rune("TURING"), func(a []rune) { | |
fmt.Println(string(a)) | |
}) | |
} |
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