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492b.go
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/
492b.go
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// 00
package main
import (
"bufio"
"fmt"
"os"
"sort"
)
func write(f *bufio.Writer, a ...interface{}) {
f.Write([]byte(fmt.Sprint(a...)))
}
type Number interface {
int64 | float64 | int
}
func min[K Number](a K, b K) K {
if a < b {
return a
}
return b
}
func max[K Number](a K, b K) K {
if a > b {
return a
}
return b
}
func abs[K Number](a K) K {
if a < 0 {
return -a
}
return a
}
func main() {
var n,l int
reader := bufio.NewReader(os.Stdin)
f := bufio.NewWriter(os.Stdout)
defer f.Flush()
fmt.Fscan(reader, &n, &l)
a := make([]int, n)
for i := 0; i < n; i++ {
fmt.Fscan(reader, &a[i])
}
sort.Ints(a)
ans := float64(0)
ans = max(ans, float64(a[0]))
ans = max(ans, float64(l-a[n-1]))
for i := 1; i < n; i++ {
ans = max(ans, float64(a[i]-a[i-1])/2)
}
write(f, ans, "\n")
}