CSES - BOI 2026 Mirror Day 2

Submission details
Task:	Sort
Sender:	kiddi
Submission time:	2026-04-20 15:01:42 +0300
Language:	C++ (C++20)
Status:	READY
Result:	67

Feedback
subtask	verdict	score
#1	ACCEPTED	6
#2	ACCEPTED	5
#3	ACCEPTED	7
#4	ACCEPTED	14
#5	ACCEPTED	23
#6	ACCEPTED	12
#7	TIME LIMIT EXCEEDED	0

Test results
test	verdict	time	subtask
#1	ACCEPTED	0.00 s	2, 6, 7	details
#2	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#3	ACCEPTED	0.00 s	2, 6, 7	details
#4	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#5	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#6	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#7	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#8	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#9	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#10	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#11	ACCEPTED	0.00 s	2, 6, 7	details
#12	ACCEPTED	0.00 s	2, 6, 7	details
#13	ACCEPTED	0.00 s	2, 6, 7	details
#14	ACCEPTED	0.00 s	2, 6, 7	details
#15	ACCEPTED	0.00 s	2, 6, 7	details
#16	ACCEPTED	1.00 s	3, 7	details
#17	ACCEPTED	1.07 s	3, 7	details
#18	ACCEPTED	1.15 s	3, 7	details
#19	ACCEPTED	1.05 s	3, 7	details
#20	ACCEPTED	1.08 s	3, 7	details
#21	ACCEPTED	1.02 s	3, 7	details
#22	ACCEPTED	1.08 s	3, 7	details
#23	ACCEPTED	0.59 s	3, 7	details
#24	ACCEPTED	0.93 s	4, 7	details
#25	ACCEPTED	0.70 s	4, 7	details
#26	ACCEPTED	1.73 s	4, 7	details
#27	ACCEPTED	0.45 s	4, 7	details
#28	ACCEPTED	1.11 s	4, 7	details
#29	ACCEPTED	0.89 s	4, 7	details
#30	ACCEPTED	0.02 s	5, 6, 7	details
#31	ACCEPTED	0.03 s	5, 6, 7	details
#32	ACCEPTED	0.02 s	5, 6, 7	details
#33	ACCEPTED	0.03 s	5, 6, 7	details
#34	ACCEPTED	0.02 s	5, 6, 7	details
#35	ACCEPTED	0.03 s	5, 6, 7	details
#36	ACCEPTED	0.02 s	6, 7	details
#37	ACCEPTED	0.03 s	6, 7	details
#38	ACCEPTED	0.03 s	6, 7	details
#39	ACCEPTED	0.03 s	6, 7	details
#40	ACCEPTED	0.02 s	6, 7	details
#41	ACCEPTED	0.03 s	6, 7	details
#42	ACCEPTED	1.17 s	7	details
#43	ACCEPTED	1.23 s	7	details
#44	ACCEPTED	1.31 s	7	details
#45	TIME LIMIT EXCEEDED	--	7	details
#46	TIME LIMIT EXCEEDED	--	7	details
#47	TIME LIMIT EXCEEDED	--	7	details
#48	TIME LIMIT EXCEEDED	--	7	details
#49	ACCEPTED	0.53 s	7	details
#50	ACCEPTED	1.29 s	7	details
#51	ACCEPTED	1.08 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	ACCEPTED	0.00 s	1, 2, 3, 4, 6, 7	details
#56	ACCEPTED	0.00 s	1, 2, 3, 6, 7	details
#57	ACCEPTED	0.00 s	6, 7	details
#58	ACCEPTED	0.18 s	3, 4, 7	details
#59	ACCEPTED	0.19 s	3, 7	details
#60	ACCEPTED	0.00 s	2, 6, 7	details
#61	ACCEPTED	0.00 s	2, 6, 7	details
#62	ACCEPTED	0.00 s	2, 6, 7	details
#63	ACCEPTED	0.00 s	2, 6, 7	details
#64	ACCEPTED	0.00 s	2, 6, 7	details

Code

#include<vector>
#include<iostream>
#include<algorithm>
#include<map>
using namespace std;

struct segmenttree {
    vector<bool> f;

    void init(int l, int r, int i, vector<int> &vs) {
        if (l == r) f[i] = vs[l]==l;
        else {
            init(l, (l+r)/2, i*2, vs);
            init((l+r)/2+1, r, i*2+1, vs);
            f[i] = f[i*2]&&f[i*2+1];            
        }
    }

    segmenttree(int n, vector<int> &vs) {
        f.resize(4*n, 0);
        init(0, n-1, 1, vs);
    }

    bool isorted(int l, int r, int ll, int rr, int i) {
        if (r < ll || rr < l) return 1;
        if (l <= ll && rr <= r) return f[i];
        return isorted(l, r, ll, (ll+rr)/2, i*2) && isorted(l, r, (ll+rr)/2+1, rr, i*2+1);
    }
};

struct mergesorttree {
    vector<vector<int>> f;

    void merge(int i, int j, int d) {
        int n(f[i].size()), m(f[j].size());
        f[d].resize(n+m);
        int ii=0, jj=0;
        for (int x = 0; x < n+m; x++) {
            if (ii==n||(jj<m&&f[i][ii]>f[j][jj])) {
                f[d][x] = f[j][jj++];
            } else f[d][x] = f[i][ii++];
        }
    }

    void init(int l, int r, int i, vector<int> &idx) {
        if (l==r) {
            f[i].push_back(idx[l]);
            return;
        }
        init(l, (l+r)/2, i*2, idx);
        init((l+r)/2+1, r, i*2+1, idx);
        merge(i*2, i*2+1, i);
    }

    mergesorttree(int n, vector<int> &idx) {
        f.resize(n*4);
        init(0, n-1, 1, idx);
    }

    int count(int lt, int i) {
        return upper_bound(f[i].begin(), f[i].end(), lt) - f[i].begin();
    }

    int tl(int l, int r, int lt, int ll, int rr, int i) {
        if (r < ll || rr < l) return 0;
        if (l <= ll && rr <= r) return count(lt, i);
        return tl(l, r, lt, ll, (ll+rr)/2, i*2) + tl(l, r, lt, (ll+rr)/2+1, rr, i*2+1);
    }

    int tr(int l, int r, int gt, int ll, int rr, int i) {
        return (r-l+1) - tl(l, r, gt-1, ll, rr, i);
    }
};

int tl(int l, int r, int ll, int n, mergesorttree &mst) {
    return mst.tl(l, r, ll, 0, n-1, 1);
}

int tr(int l, int r, int rr, int n, mergesorttree &mst) {
    return mst.tr(l, r, rr, 0, n-1, 1);
}

int isorted(int l, int r, int n, segmenttree &segs) {
    return segs.isorted(l, r, 0, n-1, 1);
}

int manyleft(int s, int ltr, int rtl) {
    return (ltr+s-1)/s + (rtl+s-1)/s + 1;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    vector<int> x(n), xs(n), idx(n);
    
    for (int i = 0; i < n; i++) {
        cin >> x[i];
        xs[i] = x[i];
    }

    sort(xs.begin(), xs.end());
    map<int, vector<int>> t;

    for (int i = 0; i < n; i++) {
        t[xs[i]].emplace_back(i);
    }

    for (int i = n-1; i >= 0; i--) {
        idx[i] = t[x[i]].back();
        t[x[i]].pop_back();
    }

    segmenttree sortchecker(n, idx);
    mergesorttree mst(n, idx);

    bool z = isorted(0, n-1, n, sortchecker);

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

        if (z) {
            cout << 0 << endl;
            continue;
        } 

        int l = a-1, r = n-b, s = l-r+1;
        if (l < r) {
            int c = 0;
            if (tr(0, l, l+1, n, mst) + tl(r, n-1, r-1, n, mst) != 0) {
                cout << -1 << endl;
                continue;
            }
            if (!isorted(0, l, n, sortchecker)) c++;
            if (!isorted(r, n-1, n, sortchecker)) c++;
            if (isorted(l+1, r-1, n, sortchecker)) cout << c << endl;
            else cout << -1 << endl;
            continue;
        }

        if (isorted(0, r-1, n, sortchecker) || isorted(l+1, n-1, n, sortchecker)) {
            cout << 1 << endl;
            continue;
        }
        
        int ltr = tr(0, r-1, l+1, n, mst), rtl = tl(l+1, n-1, r-1, n, mst);
        int mtl = tl(r, l, r-1, n, mst), mtr = tr(r, l, l+1, n, mst);

        cout << max(2, min(manyleft(s, ltr+mtr, rtl), manyleft(s, rtl+mtl, ltr))) << endl;
    }

    return 0;
}

Test details

Test 1

Subtask: 2, 6, 7

Verdict: ACCEPTED

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 2` view save

Test 2

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

input
`2 1 548813503 548813503 1 1` view save

correct output
`0` view save

user output
`0` view save

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: ACCEPTED

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

Test 5

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

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

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

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

Test 6

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

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

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

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

Test 7

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

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

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

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

Test 8

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

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

Test 9

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

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

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

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

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: ACCEPTED

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

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

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

Test 12

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 13

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 14

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 15

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 16

Subtask: 3, 7

Verdict: ACCEPTED

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

Test 17

Subtask: 3, 7

Verdict: ACCEPTED

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

Test 18

Subtask: 3, 7

Verdict: ACCEPTED

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

Test 19

Subtask: 3, 7

Verdict: ACCEPTED

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

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

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

Test 20

Subtask: 3, 7

Verdict: ACCEPTED

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

Test 21

Subtask: 3, 7

Verdict: ACCEPTED

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

Test 22

Subtask: 3, 7

Verdict: ACCEPTED

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

Test 23

Subtask: 3, 7

Verdict: ACCEPTED

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

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

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

Test 24

Subtask: 4, 7

Verdict: ACCEPTED

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
`-1 1 -1 -1 -1 ...` view save

Test 25

Subtask: 4, 7

Verdict: ACCEPTED

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
`1 -1 1 -1 1 ...` view save

Test 26

Subtask: 4, 7

Verdict: ACCEPTED

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

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 ...` view save

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

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

Test 28

Subtask: 4, 7

Verdict: ACCEPTED

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

Test 29

Subtask: 4, 7

Verdict: ACCEPTED

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

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: ACCEPTED

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

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

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

Test 36

Subtask: 6, 7

Verdict: ACCEPTED

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

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

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

Test 37

Subtask: 6, 7

Verdict: ACCEPTED

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

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

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

Test 38

Subtask: 6, 7

Verdict: ACCEPTED

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

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

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

Test 39

Subtask: 6, 7

Verdict: ACCEPTED

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

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

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

Test 40

Subtask: 6, 7

Verdict: ACCEPTED

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

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

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

Test 41

Subtask: 6, 7

Verdict: ACCEPTED

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

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

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

Test 42

Subtask: 7

Verdict: ACCEPTED

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

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

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

Test 43

Subtask: 7

Verdict: ACCEPTED

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

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

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

Test 44

Subtask: 7

Verdict: ACCEPTED

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

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

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

Test 45

Subtask: 7

Verdict: TIME LIMIT EXCEEDED

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: TIME LIMIT EXCEEDED

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: TIME LIMIT EXCEEDED

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: TIME LIMIT EXCEEDED

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: ACCEPTED

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

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

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

Test 50

Subtask: 7

Verdict: ACCEPTED

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

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

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

Test 51

Subtask: 7

Verdict: ACCEPTED

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

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

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

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: ACCEPTED

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

Test 56

Subtask: 1, 2, 3, 6, 7

Verdict: ACCEPTED

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

Test 57

Subtask: 6, 7

Verdict: ACCEPTED

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

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

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

Test 58

Subtask: 3, 4, 7

Verdict: ACCEPTED

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

Test 59

Subtask: 3, 7

Verdict: ACCEPTED

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

Test 60

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 61

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 62

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 63

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

Test 64

Subtask: 2, 6, 7

Verdict: ACCEPTED

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

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

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

BOI 2026 Mirror Day 2

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