CSES - BOI 2026 Mirror Day 2

Submission details
Task:	Sort
Sender:	jsesok
Submission time:	2026-09-30 14:09:57 +0300
Language:	C++ (C++23)
Status:	READY
Result:	0

Feedback
subtask	verdict	score
#1	WRONG ANSWER	0
#2	WRONG ANSWER	0
#3	WRONG ANSWER	0
#4	TIME LIMIT EXCEEDED	0
#5	TIME LIMIT EXCEEDED	0
#6	WRONG ANSWER	0
#7	WRONG ANSWER	0

Test results
test	verdict	time	subtask
#1	WRONG ANSWER	0.00 s	2, 6, 7	details
#2	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#3	ACCEPTED	0.00 s	2, 6, 7	details
#4	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#5	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#6	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#7	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#8	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#9	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#10	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#11	RUNTIME ERROR	0.00 s	2, 6, 7	details
#12	RUNTIME ERROR	0.00 s	2, 6, 7	details
#13	RUNTIME ERROR	0.00 s	2, 6, 7	details
#14	RUNTIME ERROR	0.00 s	2, 6, 7	details
#15	RUNTIME ERROR	0.00 s	2, 6, 7	details
#16	WRONG ANSWER	0.09 s	3, 7	details
#17	WRONG ANSWER	0.09 s	3, 7	details
#18	WRONG ANSWER	0.08 s	3, 7	details
#19	WRONG ANSWER	0.08 s	3, 7	details
#20	WRONG ANSWER	0.08 s	3, 7	details
#21	WRONG ANSWER	0.08 s	3, 7	details
#22	WRONG ANSWER	0.08 s	3, 7	details
#23	WRONG ANSWER	0.08 s	3, 7	details
#24	TIME LIMIT EXCEEDED	--	4, 7	details
#25	TIME LIMIT EXCEEDED	--	4, 7	details
#26	TIME LIMIT EXCEEDED	--	4, 7	details
#27	TIME LIMIT EXCEEDED	--	4, 7	details
#28	TIME LIMIT EXCEEDED	--	4, 7	details
#29	TIME LIMIT EXCEEDED	--	4, 7	details
#30	ACCEPTED	0.08 s	5, 6, 7	details
#31	ACCEPTED	0.07 s	5, 6, 7	details
#32	ACCEPTED	0.07 s	5, 6, 7	details
#33	ACCEPTED	0.63 s	5, 6, 7	details
#34	ACCEPTED	0.01 s	5, 6, 7	details
#35	TIME LIMIT EXCEEDED	--	5, 6, 7	details
#36	RUNTIME ERROR	0.01 s	6, 7	details
#37	RUNTIME ERROR	0.00 s	6, 7	details
#38	RUNTIME ERROR	0.01 s	6, 7	details
#39	RUNTIME ERROR	0.01 s	6, 7	details
#40	RUNTIME ERROR	0.00 s	6, 7	details
#41	RUNTIME ERROR	0.01 s	6, 7	details
#42	RUNTIME ERROR	0.03 s	7	details
#43	RUNTIME ERROR	0.03 s	7	details
#44	RUNTIME ERROR	0.03 s	7	details
#45	RUNTIME ERROR	0.03 s	7	details
#46	RUNTIME ERROR	0.03 s	7	details
#47	RUNTIME ERROR	0.03 s	7	details
#48	RUNTIME ERROR	0.03 s	7	details
#49	RUNTIME ERROR	0.03 s	7	details
#50	RUNTIME ERROR	0.03 s	7	details
#51	RUNTIME ERROR	0.03 s	7	details
#52	ACCEPTED	0.00 s	1, 2, 3, 5, 6, 7	details
#53	ACCEPTED	0.00 s	1, 2, 3, 4, 5, 6, 7	details
#54	ACCEPTED	0.00 s	2, 5, 6, 7	details
#55	WRONG ANSWER	0.00 s	1, 2, 3, 4, 6, 7	details
#56	WRONG ANSWER	0.00 s	1, 2, 3, 6, 7	details
#57	RUNTIME ERROR	0.00 s	6, 7	details
#58	WRONG ANSWER	0.03 s	3, 4, 7	details
#59	WRONG ANSWER	0.03 s	3, 7	details
#60	RUNTIME ERROR	0.00 s	2, 6, 7	details
#61	RUNTIME ERROR	0.00 s	2, 6, 7	details
#62	RUNTIME ERROR	0.00 s	2, 6, 7	details
#63	RUNTIME ERROR	0.00 s	2, 6, 7	details
#64	RUNTIME ERROR	0.00 s	2, 6, 7	details

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> a(n);

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

    // sortedPrefix[i] = a[0..i] уже строго возрастает
    vector<int> sortedPrefix(n);
    sortedPrefix[0] = 1;

    for (int i = 1; i < n; ++i)
        sortedPrefix[i] =
            sortedPrefix[i-1] && (a[i-1] < a[i]);

    // sortedSuffix[i] = a[i..n-1] уже строго возрастает
    vector<int> sortedSuffix(n);
    sortedSuffix[n-1] = 1;

    for (int i = n-2; i >= 0; --i)
        sortedSuffix[i] =
            sortedSuffix[i+1] && (a[i] < a[i+1]);


    while (q--)
    {
        int p, s;
        cin >> p >> s;

        // Массив уже отсортирован
        if (sortedPrefix[n-1])
        {
            cout << 0 << '\n';
            continue;
        }

        // =====================================================
        // p+s <= n
        // =====================================================

        if (p+s <= n)
        {
            bool ok = true;

            // middle вообще невозможно изменить
            for (int i = p; i < n-s; ++i)
            {
                if (a[i] != i+1)
                {
                    ok = false;
                    break;
                }
            }

            // В prefix должны быть значения 1..p
            if (ok)
            {
                for (int i = 0; i < p; ++i)
                {
                    if (a[i] > p)
                    {
                        ok = false;
                        break;
                    }
                }
            }

            // В suffix должны быть значения n-s+1..n
            if (ok)
            {
                for (int i = n-s; i < n; ++i)
                {
                    if (a[i] <= n-s)
                    {
                        ok = false;
                        break;
                    }
                }
            }

            if (!ok)
            {
                cout << -1 << '\n';
                continue;
            }

            int ans = 0;

            if (!sortedPrefix[p-1])
                ++ans;

            if (!sortedSuffix[n-s])
                ++ans;

            cout << ans << '\n';
            continue;
        }


        // =====================================================
        // p+s > n
        // =====================================================

        int L = n-s;
        int R = p;

        /*
            позиции:

            [  A  |  B  |  C  ]
             0..L  L..R  R..n

            P сортирует A+B
            S сортирует B+C
        */


        auto solve = [&](int first) -> int
        {
            /*
                group[x]:

                0 -> значение x сейчас находится в A
                1 -> в B
                2 -> в C

                x — само значение, от 1 до n.
            */

            vector<unsigned char> group(n+1);

            for (int i = 0; i < L; ++i)
                group[a[i]] = 0;

            for (int i = L; i < R; ++i)
                group[a[i]] = 1;

            for (int i = R; i < n; ++i)
                group[a[i]] = 2;


            /*
                Четыре указателя:

                maxA = max(A)
                minB = min(B)
                maxB = max(B)
                minC = min(C)
            */

            int maxA = n;
            int minB = 1;
            int maxB = n;
            int minC = 1;


            auto fixMaxA = [&]()
            {
                while (maxA >= 1 && group[maxA] != 0)
                    --maxA;
            };

            auto fixMinB = [&]()
            {
                while (minB <= n && group[minB] != 1)
                    ++minB;
            };

            auto fixMaxB = [&]()
            {
                while (maxB >= 1 && group[maxB] != 1)
                    --maxB;
            };

            auto fixMinC = [&]()
            {
                while (minC <= n && group[minC] != 2)
                    ++minC;
            };


            fixMaxA();
            fixMinB();
            fixMaxB();
            fixMinC();


            // До первой P часть A может быть неотсортированной.
            bool sortedA = true;

            for (int i = 1; i < L; ++i)
            {
                if (a[i-1] > a[i])
                {
                    sortedA = false;
                    break;
                }
            }

            bool sortedB = true;

            for (int i = L+1; i < R; ++i)
            {
                if (a[i-1] > a[i])
                {
                    sortedB = false;
                    break;
                }
            }

            bool sortedC = true;

            for (int i = R+1; i < n; ++i)
            {
                if (a[i-1] > a[i])
                {
                    sortedC = false;
                    break;
                }
            }


            // После одинаковой операции два раза подряд ничего нового
            // не произойдёт, поэтому достаточно P,S,P,S...
            // или S,P,S,P...
            for (int cnt = 1; cnt <= 2*n+2; ++cnt)
            {
                int type;

                if (cnt & 1)
                    type = first;
                else
                    type = first ^ 1;


                // =============================================
                // PREFIX SORT
                // =============================================

                if (type == 0)
                {
                    fixMaxA();
                    fixMinB();

                    while (maxA >= 1 &&
                           minB <= n &&
                           maxA > minB)
                    {
                        int x = maxA;
                        int y = minB;

                        // x: A -> B
                        // y: B -> A

                        group[x] = 1;
                        group[y] = 0;


                        /*
                            Обновляем указатели.

                            В A появился y.
                            В B появился x.
                        */

                        maxA = max(maxA, y);
                        minB = min(minB, x);
                        maxB = max(maxB, x);

                        fixMaxA();
                        fixMinB();
                    }

                    // P полностью сортирует A+B
                    sortedA = true;
                    sortedB = true;
                }


                // =============================================
                // SUFFIX SORT
                // =============================================

                else
                {
                    fixMaxB();
                    fixMinC();

                    while (maxB >= 1 &&
                           minC <= n &&
                           maxB > minC)
                    {
                        int x = maxB;
                        int y = minC;

                        // x: B -> C
                        // y: C -> B

                        group[x] = 2;
                        group[y] = 1;


                        /*
                            В B появился y.
                            В C появился x.
                        */

                        maxB = max(maxB, y);
                        minB = min(minB, y);
                        minC = min(minC, x);

                        fixMaxB();
                        fixMinC();
                    }

                    // S полностью сортирует B+C
                    sortedB = true;
                    sortedC = true;
                }


                // =============================================
                // Проверяем, все ли значения находятся
                // в правильных группах.
                //
                // A должно содержать 1..L
                // B должно содержать L+1..R
                // C должно содержать R+1..n
                // =============================================

                fixMaxA();
                fixMinB();
                fixMaxB();
                fixMinC();

                bool good = true;

                if (L > 0)
                {
                    if (maxA > L)
                        good = false;
                }

                if (R-L > 0)
                {
                    if (minB <= L || maxB > R)
                        good = false;
                }

                if (n-R > 0)
                {
                    if (minC <= R)
                        good = false;
                }


                if (good &&
                    sortedA &&
                    sortedB &&
                    sortedC)
                {
                    return cnt;
                }
            }

            return (int)1e9;
        };


        int ans1 = solve(0); // P,S,P,S,...
        int ans2 = solve(1); // S,P,S,P,...

        int ans = min(ans1, ans2);

        if (ans >= (int)1e9)
            cout << -1 << '\n';
        else
            cout << ans << '\n';
    }
}

Test details

Test 1

Subtask: 2, 6, 7

Verdict: WRONG ANSWER

input
`6 3 3 1 4 1 5 9 4 1 3 3 2 5` view save

correct output
`1 -1 2` view save

user output
`1 -1 -1` view save

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

Test 2

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`2 1 548813503 548813503 1 1` view save

correct output
`0` view save

user output
`-1` view save

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

Test 3

Subtask: 2, 6, 7

Verdict: ACCEPTED

input
`1 1 417021999 1 1` view save

correct output
`0` view save

user output
`0` view save

Test 4

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`10 10 20751947 20751947 20751947 494...` view save

correct output
`-1 -1 1 1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 5

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`10 10 12780811 19475241 19475241 683...` view save

correct output
`0 0 0 0 0 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 6

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`10 10 14574963 14574963 14574963 864...` view save

correct output
`0 0 0 0 0 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 7

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`10 10 237541216 237541216 35036522 6...` view save

correct output
`-1 -1 -1 2 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 8

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`10 10 319425549 513116712 539199939 ...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 9

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`10 10 54363219 54363219 110986323 11...` view save

correct output
`0 0 0 0 0 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 10

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

input
`10 5 55687086 550701455 326656159 5...` view save

correct output
`-1 -1 -1 -1 -1` view save

user output
`-1 -1 -1 -1 -1` view save

Test 11

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 35889584 588130796 815837475 8...` view save

correct output
`-1 -1 1 1 1 ...` view save

user output
(empty)

Test 12

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 679842175 48724877 720966351 6...` view save

correct output
`2 3 2 1 1 ...` view save

user output
(empty)

Test 13

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 893310183 811950921 338863962 ...` view save

correct output
`2 1 1 2 5 ...` view save

user output
(empty)

Test 14

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 221045363 282395847 441913686 ...` view save

correct output
`0 0 0 0 0 ...` view save

user output
(empty)

Test 15

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 509019662 983949268 960017302 ...` view save

correct output
`3 -1 3 3 3 ...` view save

user output
(empty)

Test 16

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`200000 200000 2277053 2277053 2277053 227705...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 46 col 1: expected "2", got "-1"

Test 17

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`200000 200000 6767 16596 16596 27202 37272 4...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 18

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`200000 200000 5393 5910 9099 15755 15755 164...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 11 col 1: expected "2", got "-1"

Test 19

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`200000 200000 3779 4629 8999 10468 22605 227...` view save

correct output
`-1 1 2 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 20

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`200000 200000 878 2791 10849 11861 13405 239...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 13 col 1: expected "2", got "-1"

Test 21

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`200000 200000 430 1479 1992 2829 7152 14093 ...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 98 col 1: expected "2", got "-1"

Test 22

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`199997 200000 2733 10526 13882 14035 14689 3...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 20 col 1: expected "1", got "-1"

Test 23

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`200000 200000 12345 13538 15407 18490 18984 ...` view save

correct output
`0 0 0 0 0 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 24

Subtask: 4, 7

Verdict: TIME LIMIT EXCEEDED

input
`200000 200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`-1 1 -1 -1 -1 ...` view save

user output
(empty)

Test 25

Subtask: 4, 7

Verdict: TIME LIMIT EXCEEDED

input
`200000 200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`1 -1 1 -1 1 ...` view save

user output
(empty)

Test 26

Subtask: 4, 7

Verdict: TIME LIMIT EXCEEDED

input
`200000 200000 2 2 1 1 2 1 2 1 2 2 2 1 1 1 2 ...` view save

correct output
`4 3 2 2 6 ...` view save

user output
(empty)

Test 27

Subtask: 4, 7

Verdict: TIME LIMIT EXCEEDED

input
`200000 200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`0 0 0 0 0 ...` view save

user output
(empty)

Test 28

Subtask: 4, 7

Verdict: TIME LIMIT EXCEEDED

input
`200000 200000 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 ...` view save

correct output
`8513 1099 35939 9299 19597 ...` view save

user output
(empty)

Test 29

Subtask: 4, 7

Verdict: TIME LIMIT EXCEEDED

input
`200000 200000 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 ...` view save

correct output
`178345 169257 62115 96143 64796 ...` view save

user output
(empty)

Test 30

Subtask: 5, 6, 7

Verdict: ACCEPTED

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

correct output
`1 1 -1 1 -1 ...` view save

user output
`1 1 -1 1 -1 ...` view save

Test 31

Subtask: 5, 6, 7

Verdict: ACCEPTED

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

correct output
`-1 2 -1 2 -1 ...` view save

user output
`-1 2 -1 2 -1 ...` view save

Test 32

Subtask: 5, 6, 7

Verdict: ACCEPTED

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

correct output
`-1 2 -1 -1 -1 ...` view save

user output
`-1 2 -1 -1 -1 ...` view save

Test 33

Subtask: 5, 6, 7

Verdict: ACCEPTED

input
`5000 5000 4033 4368 3086 3208 4313 388 8...` view save

correct output
`3 3 3 3 11 ...` view save

user output
`3 3 3 3 11 ...` view save

Test 34

Subtask: 5, 6, 7

Verdict: ACCEPTED

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

correct output
`0 0 0 0 0 ...` view save

user output
`0 0 0 0 0 ...` view save

Test 35

Subtask: 5, 6, 7

Verdict: TIME LIMIT EXCEEDED

input
`5000 5000 5000 4999 4998 4997 4996 4995 ...` view save

correct output
`2039 1910 -1 687 673 ...` view save

user output
(empty)

Test 36

Subtask: 6, 7

Verdict: RUNTIME ERROR

input
`5000 5000 202010 457852 826471 926337 10...` view save

correct output
`-1 -1 2 -1 -1 ...` view save

user output
(empty)

Test 37

Subtask: 6, 7

Verdict: RUNTIME ERROR

input
`5000 5000 190583 326486 431922 462939 72...` view save

correct output
`-1 -1 -1 -1 2 ...` view save

user output
(empty)

Test 38

Subtask: 6, 7

Verdict: RUNTIME ERROR

input
`5000 5000 821998255 400550008 71790232 5...` view save

correct output
`5 3 3 2 5 ...` view save

user output
(empty)

Test 39

Subtask: 6, 7

Verdict: RUNTIME ERROR

input
`5000 5000 266174928 446601941 191252234 ...` view save

correct output
`3 3 414 4 3 ...` view save

user output
(empty)

Test 40

Subtask: 6, 7

Verdict: RUNTIME ERROR

input
`5000 5000 11621 243915 243915 949123 137...` view save

correct output
`0 0 0 0 0 ...` view save

user output
(empty)

Test 41

Subtask: 6, 7

Verdict: RUNTIME ERROR

input
`5000 5000 999767052 998555066 997822810 ...` view save

correct output
`919 459 505 833 809 ...` view save

user output
(empty)

Test 42

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 478025 478025 478025 478025 47...` view save

correct output
`-1 -1 2 2 2 ...` view save

user output
(empty)

Test 43

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 1810 2088 3022 3097 7459 7943 ...` view save

correct output
`2 -1 -1 2 -1 ...` view save

user output
(empty)

Test 44

Subtask: 7

Verdict: RUNTIME ERROR

input
`199531 200000 11328 26391 30353 37063 44412 ...` view save

correct output
`-1 2 -1 2 2 ...` view save

user output
(empty)

Test 45

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 106738201 369187074 412614650 ...` view save

correct output
`2 12 3 19 3 ...` view save

user output
(empty)

Test 46

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 670611290 43427363 8475380 309...` view save

correct output
`3 5 3 3 3 ...` view save

user output
(empty)

Test 47

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 907542569 504758282 948727805 ...` view save

correct output
`3 33 3 3 3 ...` view save

user output
(empty)

Test 48

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 487056731 460461648 142698485 ...` view save

correct output
`3 3 3 3 3 ...` view save

user output
(empty)

Test 49

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 12772 23236 23236 23236 41149 ...` view save

correct output
`0 0 0 0 0 ...` view save

user output
(empty)

Test 50

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 999993539 999993361 999993361 ...` view save

correct output
`125375 16687 -1 84781 46147 ...` view save

user output
(empty)

Test 51

Subtask: 7

Verdict: RUNTIME ERROR

input
`200000 200000 999993539 999993361 999993361 ...` view save

correct output
`94788 177608 95881 56377 179957 ...` view save

user output
(empty)

Test 52

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

Verdict: ACCEPTED

input
`5 1 2 1 3 5 4 2 2` view save

correct output
`2` view save

user output
`2` view save

Test 53

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

Verdict: ACCEPTED

input
`2 1 1 2 1 1` view save

correct output
`0` view save

user output
`0` view save

Test 54

Subtask: 2, 5, 6, 7

Verdict: ACCEPTED

input
`4 1 2 1 4 3 3 2` view save

correct output
`2` view save

user output
`2` view save

Test 55

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

Verdict: WRONG ANSWER

input
`10 10 1 1 1 1 2 2 1 1 2 2 7 1 2 6 4 5 ...` view save

correct output
`-1 1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

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

Test 56

Subtask: 1, 2, 3, 6, 7

Verdict: WRONG ANSWER

input
`10 10 181777772 181777772 181777772 ...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 10 col 1: expected "1", got "-1"

Test 57

Subtask: 6, 7

Verdict: RUNTIME ERROR

input
`100 10 92800811 524548163 939127795 9...` view save

correct output
`-1 -1 3 -1 3 ...` view save

user output
(empty)

Test 58

Subtask: 3, 4, 7

Verdict: WRONG ANSWER

input
`100 100000 2 2 2 1 2 2 2 2 1 2 1 1 1 2 2 ...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 1401 col 1: expected "1", got "-1"

Test 59

Subtask: 3, 7

Verdict: WRONG ANSWER

input
`100 100000 172695325 172695325 172695325 ...` view save

correct output
`-1 -1 -1 -1 -1 ...` view save

user output
`-1 -1 -1 -1 -1 ...` view save

Feedback: Incorrect character on line 417 col 1: expected "1", got "-1"

Test 60

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`4 10 869194539 239439572 968540665 ...` view save

correct output
`-1 2 -1 -1 -1 ...` view save

user output
(empty)

Test 61

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 55366041 112170735 112170735 5...` view save

correct output
`-1 -1 2 1 1 ...` view save

user output
(empty)

Test 62

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 156018639 156018639 445832758 ...` view save

correct output
`-1 1 -1 -1 2 ...` view save

user output
(empty)

Test 63

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 702507512 702507512 892090406 ...` view save

correct output
`-1 2 -1 2 2 ...` view save

user output
(empty)

Test 64

Subtask: 2, 6, 7

Verdict: RUNTIME ERROR

input
`10 10 720324490 720324490 720324490 ...` view save

correct output
`-1 2 2 1 -1 ...` view save

user output
(empty)

BOI 2026 Mirror Day 2

Sort

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Test 24

Test 25

Test 26

Test 27

Test 28

Test 29

Test 30

Test 31

Test 32

Test 33

Test 34

Test 35

Test 36

Test 37

Test 38

Test 39

Test 40

Test 41

Test 42

Test 43

Test 44

Test 45

Test 46

Test 47

Test 48

Test 49

Test 50

Test 51

Test 52

Test 53

Test 54

Test 55

Test 56

Test 57

Test 58

Test 59

Test 60

Test 61

Test 62

Test 63

Test 64

Tasks

Submissions (jsesok)