CSES - Datatähti 2022 alku - Results
Submission details
Task:Ositus (Partitioning)
Sender:xnor
Submission time:2021-10-06 23:02:59
Language:Rust
Status:READY
Result:100
Feedback
groupverdictscore
#1ACCEPTED40
#2ACCEPTED25
#3ACCEPTED35
Test results
testverdicttimegroup
#1ACCEPTED0.01 s1, 2, 3details
#2ACCEPTED0.01 s1, 2, 3details
#3ACCEPTED0.01 s1, 2, 3details
#4ACCEPTED0.01 s1, 2, 3details
#5ACCEPTED0.01 s2, 3details
#6ACCEPTED0.01 s3details
#7ACCEPTED0.06 s3details

Code

const M: u64 = 1_000_000_007;

fn main() {
    let mut input = String::new();
    std::io::stdin().read_line(&mut input).unwrap();
    input.pop();

    let arr: Vec<usize> = input.bytes().map(|b| (b - b'a') as usize).collect();
    let mut counts = vec![1_u64];
    
    for i in 0..arr.len() {
        counts.push(0);
        let mut is_in_slice = [false; 26];
        is_in_slice[arr[i]] = true;
        for j in (0..=i).rev() {
            *counts.last_mut().unwrap() += counts[j];
            *counts.last_mut().unwrap() %= M;
            
            if j == 0 || is_in_slice[arr[j - 1]] {
                break;
            }

            is_in_slice[arr[j - 1]] = true;
        }
    }

    println!("{}", counts.last().unwrap());
}

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