mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-11-28 09:09:07 +00:00
32 lines
587 B
Go
32 lines
587 B
Go
|
// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
|
||
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||
|
|
|
||
|
|
// See page 8.
|
||
|
|
//!+
|
||
|
|
|
||
|
|
// Dup1 prints the text of each line that appears more than
|
||
|
|
// once in the standard input, preceded by its count.
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
counts := make(map[string]int)
|
||
|
|
input := bufio.NewScanner(os.Stdin)
|
||
|
|
for input.Scan() {
|
||
|
|
counts[input.Text()]++
|
||
|
|
}
|
||
|
|
// NOTE: ignoring potential errors from input.Err()
|
||
|
|
for line, n := range counts {
|
||
|
|
if n > 1 {
|
||
|
|
fmt.Printf("%d\t%s\n", n, line)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//!-
|