85 lines
2.0 KiB
Go
85 lines
2.0 KiB
Go
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/*
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Copyright © 2025 filifa
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package cmd
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import (
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"fmt"
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"strconv"
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"github.com/spf13/cobra"
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)
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func totientSieve(n int) chan int {
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totients := make([]int, n)
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totients[0] = 0
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totients[1] = 1
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for i := 2; i < n; i++ {
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totients[i] = i - 1
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}
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ch := make(chan int)
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go func() {
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for i := 0; i < n; i++ {
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ch <- totients[i]
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if i == 0 || i == 1 || totients[i] != i-1 {
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continue
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}
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for j := 2 * i; j < n; j += i {
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totients[j] -= totients[j] / i
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}
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}
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close(ch)
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}()
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return ch
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}
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func totient(cmd *cobra.Command, args []string) {
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n, err := strconv.Atoi(args[0])
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if err != nil {
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cobra.CheckErr(err)
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}
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for v := range totientSieve(n) {
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fmt.Println(v)
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}
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}
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// totientCmd represents the totient command
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var totientCmd = &cobra.Command{
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Use: "totient",
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Short: "Compute the totient function for all numbers less than n",
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Long: `Compute the totient function for all numbers less than n.`,
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Run: totient,
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}
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func init() {
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sieveCmd.AddCommand(totientCmd)
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// Here you will define your flags and configuration settings.
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// Cobra supports Persistent Flags which will work for this command
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// and all subcommands, e.g.:
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// totientCmd.PersistentFlags().String("foo", "", "A help for foo")
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// Cobra supports local flags which will only run when this command
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// is called directly, e.g.:
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// totientCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
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}
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