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main.go
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main.go
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package main
import (
"bufio"
. "fmt"
"io"
"os"
)
// github.com/EndlessCheng/codeforces-go
func run(_r io.Reader, out io.Writer) {
in := bufio.NewReader(_r)
min := func(a, b int) int {
if a < b {
return a
}
return b
}
max := func(a, b int) int {
if a > b {
return a
}
return b
}
var t string
Fscan(in, &t)
s := make([]byte, len(t), len(t)*2+1)
copy(s, t)
s = append(s, '#')
for i := len(t) - 1; i >= 0; i-- {
s = append(s, t[i])
}
n := len(s)
z := make([]int, n)
for i, l, r := 1, 0, 0; i < n; i++ {
z[i] = max(0, min(z[i-l], r-i+1))
for i+z[i] < n && s[z[i]] == s[i+z[i]] {
l, r = i, i+z[i]
z[i]++
}
if i > len(t) && i+z[i] == n {
Fprint(out, z[i])
break
}
}
}
func main() { run(os.Stdin, os.Stdout) }