CSES - DatatÃ¤hti 2022 alku - Results
 Task: Ositus Sender: Kirill_Akimov Submission time: 2021-10-16 23:36:29 Language: PyPy3 Status: READY Result: 100
Feedback
groupverdictscore
#1ACCEPTED40
#2ACCEPTED25
#3ACCEPTED35
Test results
testverdicttimegroup
#1ACCEPTED0.04 s1, 2, 3details
#2ACCEPTED0.04 s1, 2, 3details
#3ACCEPTED0.04 s1, 2, 3details
#4ACCEPTED0.04 s1, 2, 3details
#5ACCEPTED0.04 s2, 3details
#6ACCEPTED0.07 s3details
#7ACCEPTED0.49 s3details

### Code

```from array import array

string = input()
length = len(string)

symbols = {string[0]: 0}

index_of_preceding = array('l', [-1] * length)

number_for_symbol = array('l', [1] * length)

rightest_ntl = str()

prime_modulus = 1000000007

def extra(x, y):
global index_of_preceding
global number_for_symbol

index_of_rightest_ntl = -1

for i in range(x + 1, y):
if index_of_preceding[i] > index_of_rightest_ntl:
index_of_rightest_ntl = index_of_preceding[i]

if index_of_rightest_ntl > x:
return 0
elif index_of_rightest_ntl == -1:
return number_for_symbol[x]
else:
return number_for_symbol[x] - extra(index_of_rightest_ntl, x + 1)

start = length

for i in range(1, length):
if string[i] in symbols:
index_of_preceding[i] = symbols[string[i]]
number_for_symbol[i] = 2 ** i - number_for_symbol[index_of_preceding[i]]
symbols[string[i]] = i

rightest_ntl = string[i]
start = i + 1
break

else:
number_for_symbol[i] = 2 ** i
symbols[string[i]] = i

for i in range(start, length):

if string[i] in symbols:

index_of_preceding[i] = symbols[string[i]]
number_for_symbol[i] = 2 * number_for_symbol[i - 1] - extra(index_of_preceding[i], i)
rightest_ntl = string[i]

symbols[string[i]] = i
if not 0 <= number_for_symbol[i] < prime_modulus:
number_for_symbol[i] %= prime_modulus

else:

number_for_symbol[i] = 2 * number_for_symbol[i - 1]
symbols[string[i]] = i

if number_for_symbol[i] >= prime_modulus:
number_for_symbol[i] %= prime_modulus

print(number_for_symbol[length - 1])

```

### Test details

#### Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

input
a

correct output
1

user output
1

#### Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

input
abcdefghij

correct output
512

user output
512

#### Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

input
abcabaacbc

correct output
120

user output
120

#### Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

input
aaxxxxxxaa

correct output
4

user output
4

#### Test 5

Group: 2, 3

Verdict: ACCEPTED

input
mfyzvoxmppoxcvktmcjkryyocfweub...

correct output
643221148

user output
643221148

#### Test 6

Group: 3

Verdict: ACCEPTED

input
weinscqmmpgbrlboocvtbptgbahmwv...

correct output
831644159

user output
831644159

#### Test 7

Group: 3

Verdict: ACCEPTED

input
sxaoxcyrjoeieyinaqxwukgzdnhhsw...

correct output
816016015

user output
816016015