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package main
 
import ("fmt"
	    "math")
 
func generate_subsets(vec string, dim uint) {
 
     var i, j uint
 
     var total uint
 
     total = uint(math.Pow(2,float64(dim)) )
 
     for i = 1; i < total; i++ {
 
     	 for j = 0; j < dim; j++ {
 
     	 	if i & (1<<j) > 0 {
 
     	 	 	fmt.Printf("%c ", vec[j])
     	 	 } 
     	 }
 
         fmt.Println("")     	 
     }
}
 
func main() {
 
 
	 var myStr string
 
	 myStr = "abcdefghijk"
 
     var dim uint
 
	 dim = uint(len(myStr))
 
	 generate_subsets(myStr, dim)
}

Success #stdin #stdout 0.02s 4168KB

stdin

Standard input is empty

stdout

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j k 
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h i j k 
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d h i j k 
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f h i j k 
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b f h i j k 
a b f h i j k 
c f h i j k 
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b c f h i j k 
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d f h i j k 
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c d f h i j k 
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b c d f h i j k 
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e f h i j k 
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c e f h i j k 
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b c e f h i j k 
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d e f h i j k 
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b d e f h i j k 
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c d e f h i j k 
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b c d e f h i j k 
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g h i j k 
a g h i j k 
b g h i j k 
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c g h i j k 
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b c g h i j k 
a b c g h i j k 
d g h i j k 
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c d g h i j k 
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b c d g h i j k 
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e g h i j k 
a e g h i j k 
b e g h i j k 
a b e g h i j k 
c e g h i j k 
a c e g h i j k 
b c e g h i j k 
a b c e g h i j k 
d e g h i j k 
a d e g h i j k 
b d e g h i j k 
a b d e g h i j k 
c d e g h i j k 
a c d e g h i j k 
b c d e g h i j k 
a b c d e g h i j k 
f g h i j k 
a f g h i j k 
b f g h i j k 
a b f g h i j k 
c f g h i j k 
a c f g h i j k 
b c f g h i j k 
a b c f g h i j k 
d f g h i j k 
a d f g h i j k 
b d f g h i j k 
a b d f g h i j k 
c d f g h i j k 
a c d f g h i j k 
b c d f g h i j k 
a b c d f g h i j k 
e f g h i j k 
a e f g h i j k 
b e f g h i j k 
a b e f g h i j k 
c e f g h i j k 
a c e f g h i j k 
b c e f g h i j k 
a b c e f g h i j k 
d e f g h i j k 
a d e f g h i j k 
b d e f g h i j k 
a b d e f g h i j k 
c d e f g h i j k 
a c d e f g h i j k 
b c d e f g h i j k 
a b c d e f g h i j k

https://ideone.com/HpYrkP

Generates all subsets of a set based on Bitwise Operators & and <<

language:

Go (go 1.12.1)

created:

visibility:

secret

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