Submission details
Task:Sort
Sender:saarixx
Submission time:2026-04-17 13:06:08 +0300
Language:C++ (C++23)
Status:READY
Result:0
Feedback
subtaskverdictscore
#10
#20
#30
#40
#50
#60
#70
Test results
testverdicttimesubtask
#10.00 s2, 6, 7details
#2ACCEPTED0.00 s1, 2, 3, 6, 7details
#3ACCEPTED0.00 s2, 6, 7details
#40.00 s1, 2, 3, 6, 7details
#5ACCEPTED0.00 s1, 2, 3, 6, 7details
#6ACCEPTED0.00 s1, 2, 3, 6, 7details
#70.00 s1, 2, 3, 6, 7details
#80.00 s1, 2, 3, 6, 7details
#9ACCEPTED0.00 s1, 2, 3, 6, 7details
#100.00 s1, 2, 3, 6, 7details
#110.00 s2, 6, 7details
#120.00 s2, 6, 7details
#130.00 s2, 6, 7details
#14ACCEPTED0.00 s2, 6, 7details
#150.00 s2, 6, 7details
#160.08 s3, 7details
#170.09 s3, 7details
#180.09 s3, 7details
#190.08 s3, 7details
#200.08 s3, 7details
#210.09 s3, 7details
#220.09 s3, 7details
#23ACCEPTED0.08 s3, 7details
#240.07 s4, 7details
#250.07 s4, 7details
#260.07 s4, 7details
#27ACCEPTED0.08 s4, 7details
#280.07 s4, 7details
#290.08 s4, 7details
#300.01 s5, 6, 7details
#310.01 s5, 6, 7details
#320.01 s5, 6, 7details
#330.01 s5, 6, 7details
#34ACCEPTED0.01 s5, 6, 7details
#350.01 s5, 6, 7details
#360.01 s6, 7details
#370.01 s6, 7details
#380.01 s6, 7details
#390.01 s6, 7details
#40ACCEPTED0.01 s6, 7details
#410.01 s6, 7details
#420.09 s7details
#430.09 s7details
#440.09 s7details
#450.09 s7details
#460.09 s7details
#470.09 s7details
#480.09 s7details
#49ACCEPTED0.08 s7details
#500.08 s7details
#510.09 s7details
#52ACCEPTED0.00 s1, 2, 3, 5, 6, 7details
#53ACCEPTED0.00 s1, 2, 3, 4, 5, 6, 7details
#54ACCEPTED0.00 s2, 5, 6, 7details
#550.00 s1, 2, 3, 4, 6, 7details
#560.00 s1, 2, 3, 6, 7details
#570.00 s6, 7details
#580.03 s3, 4, 7details
#590.03 s3, 7details
#600.00 s2, 6, 7details
#610.00 s2, 6, 7details
#620.00 s2, 6, 7details
#630.00 s2, 6, 7details
#640.00 s2, 6, 7details

Code

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, q;
    cin >> n >> q;

    vector<int> x(n);
    for (int i = 0; i < n; i++) cin >> x[i];

    int first_bad = -1, last_bad = -1;

    for (int i = 0; i + 1 < n; i++) {
        if (x[i] > x[i + 1]) {
            if (first_bad == -1) first_bad = i;
            last_bad = i;
        }
    }

    while (q--) {
        int a, b;
        cin >> a >> b;

        // Already sorted
        if (first_bad == -1) {
            cout << 0 << '\n';
            continue;
        }

        // Convert to 0-based logic:
        // prefix covers [0 ... a-1]
        // suffix covers [n-b ... n-1]

        // Case 1: one prefix operation
        if (a - 1 > last_bad) {
            cout << 1 << '\n';
            continue;
        }

        // Case 2: one suffix operation
        if (n - b <= first_bad) {
            cout << 1 << '\n';
            continue;
        }

        // Case 3: two operations
        // Need to cover all bad indices:
        // prefix covers up to a-1
        // suffix covers from n-b

        // If there's a gap: impossible
        if (a - 1 < first_bad && n - b > last_bad) {
            cout << -1 << '\n';
        } else {
            cout << 2 << '\n';
        }
    }

    return 0;
}

Test details

Test 1

Subtask: 2, 6, 7

Verdict:

input
6 3
3 1 4 1 5 9
4 1
3 3
2 5

correct output
1
-1
2

user output
1
2
2

Feedback: Incorrect character on line 2 col 1: expected "-1", got "2"

Test 2

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

input
2 1
548813503 548813503
1 1

correct output
0

user output
0

Test 3

Subtask: 2, 6, 7

Verdict: ACCEPTED

input
1 1
417021999
1 1

correct output
0

user output
0

Test 4

Subtask: 1, 2, 3, 6, 7

Verdict:

input
10 10
20751947 20751947 20751947 494...

correct output
-1
-1
1
1
-1
...

user output
-1
-1
1
1
-1
...

Feedback: Incorrect character on line 8 col 1: expected "-1", got "1"

Test 5

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

input
10 10
12780811 19475241 19475241 683...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 6

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

input
10 10
14574963 14574963 14574963 864...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 7

Subtask: 1, 2, 3, 6, 7

Verdict:

input
10 10
237541216 237541216 35036522 6...

correct output
-1
-1
-1
2
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 8

Subtask: 1, 2, 3, 6, 7

Verdict:

input
10 10
319425549 513116712 539199939 ...

correct output
-1
-1
-1
-1
-1
...

user output
-1
-1
2
2
2
...

Feedback: Incorrect character on line 3 col 1: expected "-1", got "2"

Test 9

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

input
10 10
54363219 54363219 110986323 11...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 10

Subtask: 1, 2, 3, 6, 7

Verdict:

input
10 5
55687086 550701455 326656159 5...

correct output
-1
-1
-1
-1
-1

user output
2
2
-1
2
2

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 11

Subtask: 2, 6, 7

Verdict:

input
10 10
35889584 588130796 815837475 8...

correct output
-1
-1
1
1
1
...

user output
-1
-1
1
1
1
...

Feedback: Incorrect character on line 6 col 1: expected "-1", got "2"

Test 12

Subtask: 2, 6, 7

Verdict:

input
10 10
679842175 48724877 720966351 6...

correct output
2
3
2
1
1
...

user output
2
2
2
1
1
...

Feedback: Incorrect character on line 2 col 1: expected "3", got "2"

Test 13

Subtask: 2, 6, 7

Verdict:

input
10 10
893310183 811950921 338863962 ...

correct output
2
1
1
2
5
...

user output
1
1
1
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "2", got "1"

Test 14

Subtask: 2, 6, 7

Verdict: ACCEPTED

input
10 10
221045363 282395847 441913686 ...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 15

Subtask: 2, 6, 7

Verdict:

input
10 10
509019662 983949268 960017302 ...

correct output
3
-1
3
3
3
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "2"

Test 16

Subtask: 3, 7

Verdict:

input
200000 200000
2277053 2277053 2277053 227705...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 17

Subtask: 3, 7

Verdict:

input
200000 200000
6767 16596 16596 27202 37272 4...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 18

Subtask: 3, 7

Verdict:

input
200000 200000
5393 5910 9099 15755 15755 164...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 19

Subtask: 3, 7

Verdict:

input
200000 200000
3779 4629 8999 10468 22605 227...

correct output
-1
1
2
-1
-1
...

user output
2
1
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 20

Subtask: 3, 7

Verdict:

input
200000 200000
878 2791 10849 11861 13405 239...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 21

Subtask: 3, 7

Verdict:

input
200000 200000
430 1479 1992 2829 7152 14093 ...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 22

Subtask: 3, 7

Verdict:

input
199997 200000
2733 10526 13882 14035 14689 3...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 23

Subtask: 3, 7

Verdict: ACCEPTED

input
200000 200000
12345 13538 15407 18490 18984 ...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 24

Subtask: 4, 7

Verdict:

input
200000 200000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

correct output
-1
1
-1
-1
-1
...

user output
2
1
2
-1
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 25

Subtask: 4, 7

Verdict:

input
200000 200000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

correct output
1
-1
1
-1
1
...

user output
1
2
1
2
1
...

Feedback: Incorrect character on line 2 col 1: expected "-1", got "2"

Test 26

Subtask: 4, 7

Verdict:

input
200000 200000
2 2 1 1 2 1 2 1 2 2 2 1 1 1 2 ...

correct output
4
3
2
2
6
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "4", got "2"

Test 27

Subtask: 4, 7

Verdict: ACCEPTED

input
200000 200000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 28

Subtask: 4, 7

Verdict:

input
200000 200000
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 ...

correct output
8513
1099
35939
9299
19597
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "8513", got "2"

Test 29

Subtask: 4, 7

Verdict:

input
200000 200000
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 ...

correct output
178345
169257
62115
96143
64796
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "178345", got "2"

Test 30

Subtask: 5, 6, 7

Verdict:

input
5000 5000
1 2 3 4 5 6 7 8 9 10 11 12 13 ...

correct output
1
1
-1
1
-1
...

user output
1
1
2
1
2
...

Feedback: Incorrect character on line 3 col 1: expected "-1", got "2"

Test 31

Subtask: 5, 6, 7

Verdict:

input
5000 5000
1 2 3 4 5 6 7 8 9 72 145 47 19...

correct output
-1
2
-1
2
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 32

Subtask: 5, 6, 7

Verdict:

input
4999 5000
1 2 3 4 5 6 7 8 9 10 11 12 13 ...

correct output
-1
2
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 33

Subtask: 5, 6, 7

Verdict:

input
5000 5000
4033 4368 3086 3208 4313 388 8...

correct output
3
3
3
3
11
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "2"

Test 34

Subtask: 5, 6, 7

Verdict: ACCEPTED

input
5000 5000
1 2 3 4 5 6 7 8 9 10 11 12 13 ...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 35

Subtask: 5, 6, 7

Verdict:

input
5000 5000
5000 4999 4998 4997 4996 4995 ...

correct output
2039
1910
-1
687
673
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 2: expected "2039", got "2"

Test 36

Subtask: 6, 7

Verdict:

input
5000 5000
202010 457852 826471 926337 10...

correct output
-1
-1
2
-1
-1
...

user output
2
2
2
2
-1
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 37

Subtask: 6, 7

Verdict:

input
5000 5000
190583 326486 431922 462939 72...

correct output
-1
-1
-1
-1
2
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 38

Subtask: 6, 7

Verdict:

input
5000 5000
821998255 400550008 71790232 5...

correct output
5
3
3
2
5
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "5", got "2"

Test 39

Subtask: 6, 7

Verdict:

input
5000 5000
266174928 446601941 191252234 ...

correct output
3
3
414
4
3
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "2"

Test 40

Subtask: 6, 7

Verdict: ACCEPTED

input
5000 5000
11621 243915 243915 949123 137...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 41

Subtask: 6, 7

Verdict:

input
5000 5000
999767052 998555066 997822810 ...

correct output
919
459
505
833
809
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "919", got "2"

Test 42

Subtask: 7

Verdict:

input
200000 200000
478025 478025 478025 478025 47...

correct output
-1
-1
2
2
2
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 43

Subtask: 7

Verdict:

input
200000 200000
1810 2088 3022 3097 7459 7943 ...

correct output
2
-1
-1
2
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 2 col 1: expected "-1", got "2"

Test 44

Subtask: 7

Verdict:

input
199531 200000
11328 26391 30353 37063 44412 ...

correct output
-1
2
-1
2
2
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 45

Subtask: 7

Verdict:

input
200000 200000
106738201 369187074 412614650 ...

correct output
2
12
3
19
3
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 2 col 1: expected "12", got "2"

Test 46

Subtask: 7

Verdict:

input
200000 200000
670611290 43427363 8475380 309...

correct output
3
5
3
3
3
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "2"

Test 47

Subtask: 7

Verdict:

input
200000 200000
907542569 504758282 948727805 ...

correct output
3
33
3
3
3
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "2"

Test 48

Subtask: 7

Verdict:

input
200000 200000
487056731 460461648 142698485 ...

correct output
3
3
3
3
3
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "2"

Test 49

Subtask: 7

Verdict: ACCEPTED

input
200000 200000
12772 23236 23236 23236 41149 ...

correct output
0
0
0
0
0
...

user output
0
0
0
0
0
...

Test 50

Subtask: 7

Verdict:

input
200000 200000
999993539 999993361 999993361 ...

correct output
125375
16687
-1
84781
46147
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "125375", got "2"

Test 51

Subtask: 7

Verdict:

input
200000 200000
999993539 999993361 999993361 ...

correct output
94788
177608
95881
56377
179957
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "94788", got "2"

Test 52

Subtask: 1, 2, 3, 5, 6, 7

Verdict: ACCEPTED

input
5 1
2 1 3 5 4
2 2

correct output
2

user output
2

Test 53

Subtask: 1, 2, 3, 4, 5, 6, 7

Verdict: ACCEPTED

input
2 1
1 2
1 1

correct output
0

user output
0

Test 54

Subtask: 2, 5, 6, 7

Verdict: ACCEPTED

input
4 1
2 1 4 3
3 2

correct output
2

user output
2

Test 55

Subtask: 1, 2, 3, 4, 6, 7

Verdict:

input
10 10
1 1 1 1 2 2 1 1 2 2
7 1
2 6
4 5
...

correct output
-1
1
-1
-1
-1
...

user output
1
1
1
2
1
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "1"

Test 56

Subtask: 1, 2, 3, 6, 7

Verdict:

input
10 10
181777772 181777772 181777772 ...

correct output
-1
-1
-1
-1
-1
...

user output
1
2
2
2
-1
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "1"

Test 57

Subtask: 6, 7

Verdict:

input
100 10
92800811 524548163 939127795 9...

correct output
-1
-1
3
-1
3
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 58

Subtask: 3, 4, 7

Verdict:

input
100 100000
2 2 2 1 2 2 2 2 1 2 1 1 1 2 2 ...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 59

Subtask: 3, 7

Verdict:

input
100 100000
172695325 172695325 172695325 ...

correct output
-1
-1
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 60

Subtask: 2, 6, 7

Verdict:

input
4 10
869194539 239439572 968540665 ...

correct output
-1
2
-1
-1
-1
...

user output
2
2
2
2
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 61

Subtask: 2, 6, 7

Verdict:

input
10 10
55366041 112170735 112170735 5...

correct output
-1
-1
2
1
1
...

user output
2
-1
2
1
1
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 62

Subtask: 2, 6, 7

Verdict:

input
10 10
156018639 156018639 445832758 ...

correct output
-1
1
-1
-1
2
...

user output
-1
1
2
2
2
...

Feedback: Incorrect character on line 3 col 1: expected "-1", got "2"

Test 63

Subtask: 2, 6, 7

Verdict:

input
10 10
702507512 702507512 892090406 ...

correct output
-1
2
-1
2
2
...

user output
2
2
2
1
1
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"

Test 64

Subtask: 2, 6, 7

Verdict:

input
10 10
720324490 720324490 720324490 ...

correct output
-1
2
2
1
-1
...

user output
2
2
1
1
2
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "2"