40 lines
585 B
Go
40 lines
585 B
Go
package util
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import (
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"io"
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"math/rand"
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"os"
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"time"
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)
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// Return a slice of range [0, n)
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func Range(n int) []int {
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s := make([]int, n)
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for i := 0; i < n; i++ {
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s[i] = i
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}
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return s
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}
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func ShuffleSlice(a []int) {
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rand.Seed(time.Now().UnixNano())
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rand.Shuffle(len(a), func(i, j int) { a[i], a[j] = a[j], a[i] })
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}
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func CopyFile(srcPath, dstPath string) error {
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fin, err := os.Open(srcPath)
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if err != nil {
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return err
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}
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defer fin.Close()
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fout, err := os.Create(dstPath)
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if err != nil {
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return err
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}
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defer fout.Close()
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_, err = io.Copy(fout, fin)
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return err
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}
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