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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"os"
"sort"
"strconv"
)
type Sl []string
var (
N, L int
s Sl
)
func (sl Sl) Len() int {
return len(sl)
}
func (sl Sl) Less(i, j int) bool {
return sl[i] < sl[j]
}
func (sl Sl) Swap(i, j int) {
sl[i], sl[j] = sl[j], sl[i]
}
func readVariables() {
N, L = nextInt(), nextInt()
s = make([]string, N)
for i := 0; i < N; i++ {
s[i] = nextStr()
}
}
func main() {
readVariables()
sort.Sort(s)
// fmt.Println(s)
for i := 0; i < N; i++ {
fmt.Print(s[i])
}
fmt.Println()
}
/* 以下、テンプレート*/
var scanner *bufio.Scanner
func init() {
scanner = bufio.NewScanner(os.Stdin)
scanner.Split(bufio.ScanWords)
}
//nextInt converts next token from stdin and returns integer value.
//nextInt panics when conversion into an integer fails.
func nextInt() int {
if !scanner.Scan() {
panic("No more token.")
}
num, err := strconv.Atoi(scanner.Text())
if err != nil {
panic("nextInt(): cannot convert to int: " + scanner.Text())
}
return num
}
func nextStr() string {
if !scanner.Scan() {
panic("No more token.")
}
return scanner.Text()
}