Submission #16652703

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package main
import (
  "bufio"
  "fmt"
  "os"
  "sort"
  "strconv"
  "strings"
)
var sc = bufio.NewScanner(os.Stdin)
func Scan() string {
  sc.Scan()
  return sc.Text()
}
func rScan() []rune {
  return []rune(Scan())
}
func iScan() int {
 
 
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package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
	"strings"
)

var sc = bufio.NewScanner(os.Stdin)

func Scan() string {
	sc.Scan()
	return sc.Text()
}
func rScan() []rune {
	return []rune(Scan())
}
func iScan() int {
	n, _ := strconv.Atoi(Scan())
	return n
}
func fScan() float64 {
	n, _ := strconv.ParseFloat(Scan(), 64)
	return n
}
func stringToInt(s string) int {
	n, _ := strconv.Atoi(s)
	return n
}
func SScan(n int) []string {
	a := make([]string, n)
	for i := 0; i < n; i++ {
		a[i] = Scan()
	}
	return a
}
func iSScan(n int) []int {
	a := make([]int, n)
	for i := 0; i < n; i++ {
		a[i] = iScan()
	}
	return a
}
func abs(x int) int {
	if x < 0 {
		x = -x
	}
	return x
}
func mod(x, d int) int {
	x %= d
	if x < 0 {
		x += d
	}
	return x
}
func larger(a, b int) int {
	if a < b {
		return b
	} else {
		return a
	}
}
func smaller(a, b int) int {
	if a > b {
		return b
	} else {
		return a
	}
}
func max(a []int) int {
	x := a[0]
	for i := 0; i < len(a); i++ {
		if x < a[i] {
			x = a[i]
		}
	}
	return x
}
func min(a []int) int {
	x := a[0]
	for i := 0; i < len(a); i++ {
		if x > a[i] {
			x = a[i]
		}
	}
	return x
}
func sum(a []int) int {
	x := 0
	for _, v := range a {
		x += v
	}
	return x
}
func fSum(a []float64) float64 {
	x := 0.
	for _, v := range a {
		x += v
	}
	return x
}
func bPrint(f bool, x string, y string) {
	if f {
		fmt.Println(x)
	} else {
		fmt.Println(y)
	}
}
func iSSPrint(x []int) {
	fmt.Println(strings.Trim(fmt.Sprint(x), "[]"))
}

var lp1 int = 1000000007
var lp2 int = 998244353

func main() {
	buf := make([]byte, 0)
	sc.Buffer(buf, lp1)
	sc.Split(bufio.ScanWords)
	s := Scan()
	sa := suffixArrayS(s)
	ans := len(s) * (len(s) + 1) / 2
	l := lcpArrayS(s, sa)
	for _, x := range l {
		ans -= x
	}
	fmt.Println(ans)
}

func saIs(s []int, upper int) []int {
	n := len(s)
	if n == 0 {
		return []int{}
	}
	if n == 1 {
		return []int{0}
	}
	if n == 2 {
		if s[0] < s[1] {
			return []int{0, 1}
		} else {
			return []int{1, 0}
		}
	}
	sa := make([]int, n)
	ls := make([]bool, n)
	for i := n - 2; i >= 0; i-- {
		if s[i] == s[i+1] {
			ls[i] = ls[i+1]
		} else {
			ls[i] = s[i] < s[i+1]
		}
	}
	sumL, sumS := make([]int, upper+1), make([]int, upper+1)
	for i := 0; i < n; i++ {
		if !ls[i] {
			sumS[s[i]]++
		} else {
			sumL[s[i]+1]++
		}
	}
	for i := 0; i <= upper; i++ {
		sumS[i] += sumL[i]
		if i < upper {
			sumL[i+1] += sumS[i]
		}
	}
	induce := func(lms []int) {
		for i := 0; i < n; i++ {
			sa[i] = -1
		}
		buf := make([]int, upper+1)
		copy(buf, sumS)
		for _, d := range lms {
			if d == n {
				continue
			}
			sa[buf[s[d]]] = d
			buf[s[d]]++
		}
		copy(buf, sumL)
		sa[buf[s[n-1]]] = n - 1
		buf[s[n-1]]++
		for i := 0; i < n; i++ {
			v := sa[i]
			if v >= 1 && !ls[v-1] {
				sa[buf[s[v-1]]] = v - 1
				buf[s[v-1]]++
			}
		}
		copy(buf, sumL)
		for i := n - 1; i >= 0; i-- {
			v := sa[i]
			if v >= 1 && ls[v-1] {
				buf[s[v-1]+1]--
				sa[buf[s[v-1]+1]] = v - 1
			}
		}
	}
	lmsMap := make([]int, n+1)
	for i, _ := range lmsMap {
		lmsMap[i] = -1
	}
	m := 0
	for i := 1; i < n; i++ {
		if !ls[i-1] && ls[i] {
			lmsMap[i] = m
			m++
		}
	}
	lms := make([]int, 0, m)
	for i := 1; i < n; i++ {
		if !ls[i-1] && ls[i] {
			lms = append(lms, i)
		}
	}
	induce(lms)
	if m != 0 {
		sortedLms := make([]int, 0, m)
		for _, v := range sa {
			if lmsMap[v] != -1 {
				sortedLms = append(sortedLms, v)
			}
		}
		recS := make([]int, m)
		recUpper := 0
		recS[lmsMap[sortedLms[0]]] = 0
		for i := 1; i < m; i++ {
			l := sortedLms[i-1]
			r := sortedLms[i]
			endL, endR := n, n
			if lmsMap[l]+1 < m {
				endL = lms[lmsMap[l]+1]
			}
			if lmsMap[r]+1 < m {
				endR = lms[lmsMap[r]+1]
			}
			same := true
			if endL-l != endR-r {
				same = false
			} else {
				for l < endL {
					if s[l] != s[r] {
						break
					}
					l++
					r++
				}
				if l == n || s[l] != s[r] {
					same = false
				}
			}
			if !same {
				recUpper++
			}
			recS[lmsMap[sortedLms[i]]] = recUpper
		}
		recSa := saIs(recS, recUpper)
		for i := 0; i < m; i++ {
			sortedLms[i] = lms[recSa[i]]
		}
		induce(sortedLms)
	}
	return sa
}
func suffixArray(s []int, upper int) []int {
	sa := saIs(s, upper)
	return sa
}
func suffixArrayT(s []int) []int {
	n := len(s)
	idx := make([]int, n)
	for i := 0; i < n; i++ {
		idx[i] = i
	}
	sort.Slice(idx, func(l, r int) bool { return s[l] < s[r] })
	s2 := make([]int, n)
	now := 0
	for i := 0; i < n; i++ {
		if i != 0 && s[idx[i-1]] != s[idx[i]] {
			now++
		}
		s2[idx[i]] = now
	}
	return saIs(s2, now)
}
func suffixArrayS(s string) []int {
	n := len(s)
	s2 := make([]int, n)
	for i := 0; i < n; i++ {
		s2[i] = int(s[i])
	}
	return saIs(s2, 255)
}
func lcpArray(s, sa []int) []int {
	n := len(s)
	rnk := make([]int, n)
	for i := 0; i < n; i++ {
		rnk[sa[i]] = i
	}
	lcp := make([]int, n-1)
	h := 0
	for i := 0; i < n; i++ {
		if h > 0 {
			h--
		}
		if rnk[i] == 0 {
			continue
		}
		j := sa[rnk[i]-1]
		for ; j+h < n && i+h < n; h++ {
			if s[j+h] != s[i+h] {
				break
			}
		}
		lcp[rnk[i]-1] = h
	}
	return lcp
}
func lcpArrayS(s string, sa []int) []int {
	n := len(s)
	s2 := make([]int, n)
	for i := 0; i < n; i++ {
		s2[i] = int(s[i])
	}
	return lcpArray(s2, sa)
}
func zAlgorithm(s []int) []int {
	n := len(s)
	if n == 0 {
		return []int{}
	}
	z := make([]int, n)
	z[0] = 0
	for i, j := 1, 0; i < n; i++ {
		if j+z[j] <= i {
			z[i] = 0
		} else {
			z[i] = zmin(j+z[j]-i, z[i-j])
		}
		for i+z[i] < n && s[z[i]] == s[i+z[i]] {
			z[i]++
		}
		if j+z[j] < i+z[i] {
			j = i
		}
	}
	z[0] = n
	return z
}
func zmin(a, b int) int {
	if a < b {
		return a
	} else {
		return b
	}
}
func zAlgorithmS(s string) []int {
	n := len(s)
	s2 := make([]int, n)
	for i := 0; i < n; i++ {
		s2[i] = int(s[i])
	}
	return zAlgorithm(s2)
}

Submission Info

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