Submission details
Task:Sort
Sender:Lia_Cruz
Submission time:2026-04-17 12:49:33 +0300
Language:C++ (C++20)
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
#160.35 s3, 7details
#170.35 s3, 7details
#180.35 s3, 7details
#190.35 s3, 7details
#200.36 s3, 7details
#210.35 s3, 7details
#220.35 s3, 7details
#23ACCEPTED0.35 s3, 7details
#240.35 s4, 7details
#250.35 s4, 7details
#260.35 s4, 7details
#27ACCEPTED0.35 s4, 7details
#280.36 s4, 7details
#290.35 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
#420.36 s7details
#430.35 s7details
#440.36 s7details
#450.35 s7details
#460.35 s7details
#470.36 s7details
#480.35 s7details
#49ACCEPTED0.35 s7details
#500.35 s7details
#510.35 s7details
#520.00 s1, 2, 3, 5, 6, 7details
#53ACCEPTED0.00 s1, 2, 3, 4, 5, 6, 7details
#540.00 s2, 5, 6, 7details
#550.00 s1, 2, 3, 4, 6, 7details
#560.00 s1, 2, 3, 6, 7details
#570.00 s6, 7details
#580.16 s3, 4, 7details
#590.16 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;

#define int long long
#define F first
#define S second
#define pb push_back

#define vi vector<int>
#define pii pair<int, int>
#define vvi vector<vector<int>>

#define sz(x) x.size()
#define all(x) (x).begin(), x.end()
#define rall(x) (x).rbegin(), (x).rend()

const int INF = 1e18;
const int MOD = 1e9 + 7;

int32_t main(){
    cin.tie(0)->sync_with_stdio(0);
    cout.precision(0);
    cout << fixed;

    int n, t;
    cin>>n>>t;

    vi a(n);
    for(auto &x : a){
        cin>>x;
    }

    vi b(n + 1), pref(n + 1);
    for(int i = 1; n > i; i++){
        b[i] = (a[i] == 2 && a[i + 1] == 1);
        pref[i] = pref[i - 1] + b[i];
    }

    auto f = [&](int l, int r){
        if(l >= r){
            return true;
        }

        return (pref[r - 1] - pref[l - 1] == 0);
    };

    while(t--){
        int X, Y;
        cin>>X>>Y;

        int ans = 3;
        if(!pref[n - 1]){
            cout<<"0"<<endl;
            continue;
        }

        if(f(X + 1, n)){
            ans = min(ans, 1LL);
        }

        if(f(1, n - Y)){
            ans = min(ans, 1LL);
        }

        if(f(X + 1, n - Y)){
            ans = min(ans, 2LL);
        }

        cout<<ans<<endl;
    }




    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
0
0
0

Feedback: Incorrect character on line 1 col 1: expected "1", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 8

Subtask: 1, 2, 3, 6, 7

Verdict:

input
10 10
319425549 513116712 539199939 ...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

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
0
0
0
0
0

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 11

Subtask: 2, 6, 7

Verdict:

input
10 10
35889584 588130796 815837475 8...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 12

Subtask: 2, 6, 7

Verdict:

input
10 10
679842175 48724877 720966351 6...

correct output
2
3
2
1
1
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "2", got "0"

Test 13

Subtask: 2, 6, 7

Verdict:

input
10 10
893310183 811950921 338863962 ...

correct output
2
1
1
2
5
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "2", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "0"

Test 16

Subtask: 3, 7

Verdict:

input
200000 200000
2277053 2277053 2277053 227705...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 17

Subtask: 3, 7

Verdict:

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

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 18

Subtask: 3, 7

Verdict:

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

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 19

Subtask: 3, 7

Verdict:

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

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 20

Subtask: 3, 7

Verdict:

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

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 21

Subtask: 3, 7

Verdict:

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

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 22

Subtask: 3, 7

Verdict:

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

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

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
3
1
3
3
3
...

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

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
3
1
3
1
...

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

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "1", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "0"

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
1
1
1
1
1
...

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

Test 36

Subtask: 6, 7

Verdict:

input
5000 5000
202010 457852 826471 926337 10...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 37

Subtask: 6, 7

Verdict:

input
5000 5000
190583 326486 431922 462939 72...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 38

Subtask: 6, 7

Verdict:

input
5000 5000
821998255 400550008 71790232 5...

correct output
5
3
3
2
5
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "5", got "0"

Test 39

Subtask: 6, 7

Verdict:

input
5000 5000
266174928 446601941 191252234 ...

correct output
3
3
414
4
3
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "919", got "0"

Test 42

Subtask: 7

Verdict:

input
200000 200000
478025 478025 478025 478025 47...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 43

Subtask: 7

Verdict:

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

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "2", got "0"

Test 44

Subtask: 7

Verdict:

input
199531 200000
11328 26391 30353 37063 44412 ...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 45

Subtask: 7

Verdict:

input
200000 200000
106738201 369187074 412614650 ...

correct output
2
12
3
19
3
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "2", got "0"

Test 46

Subtask: 7

Verdict:

input
200000 200000
670611290 43427363 8475380 309...

correct output
3
5
3
3
3
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "0"

Test 47

Subtask: 7

Verdict:

input
200000 200000
907542569 504758282 948727805 ...

correct output
3
33
3
3
3
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "0"

Test 48

Subtask: 7

Verdict:

input
200000 200000
487056731 460461648 142698485 ...

correct output
3
3
3
3
3
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "3", got "0"

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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "125375", got "0"

Test 51

Subtask: 7

Verdict:

input
200000 200000
999993539 999993361 999993361 ...

correct output
94788
177608
95881
56377
179957
...

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "94788", got "0"

Test 52

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

Verdict:

input
5 1
2 1 3 5 4
2 2

correct output
2

user output
0

Feedback: Incorrect character on line 1 col 1: expected "2", got "0"

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:

input
4 1
2 1 4 3
3 2

correct output
2

user output
0

Feedback: Incorrect character on line 1 col 1: expected "2", got "0"

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
1
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
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 57

Subtask: 6, 7

Verdict:

input
100 10
92800811 524548163 939127795 9...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

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
3
3
3
3
3
...

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

Test 59

Subtask: 3, 7

Verdict:

input
100 100000
172695325 172695325 172695325 ...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 60

Subtask: 2, 6, 7

Verdict:

input
4 10
869194539 239439572 968540665 ...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 61

Subtask: 2, 6, 7

Verdict:

input
10 10
55366041 112170735 112170735 5...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 62

Subtask: 2, 6, 7

Verdict:

input
10 10
156018639 156018639 445832758 ...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 63

Subtask: 2, 6, 7

Verdict:

input
10 10
702507512 702507512 892090406 ...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"

Test 64

Subtask: 2, 6, 7

Verdict:

input
10 10
720324490 720324490 720324490 ...

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

user output
0
0
0
0
0
...

Feedback: Incorrect character on line 1 col 1: expected "-1", got "0"