CSES - BOI 2026 Mirror Day 2

Submission details
Task:	Sort
Sender:	sofapuden
Submission time:	2026-04-17 12:57:37 +0300
Language:	C++ (C++20)
Status:	READY
Result:	100

Feedback
subtask	verdict	score
#1	ACCEPTED	6
#2	ACCEPTED	5
#3	ACCEPTED	7
#4	ACCEPTED	14
#5	ACCEPTED	23
#6	ACCEPTED	12
#7	ACCEPTED	33

Test results
test	verdict	time	subtask
#1	ACCEPTED	0.04 s	2, 6, 7	details
#2	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#3	ACCEPTED	0.04 s	2, 6, 7	details
#4	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#5	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#6	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#7	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#8	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#9	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#10	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#11	ACCEPTED	0.04 s	2, 6, 7	details
#12	ACCEPTED	0.04 s	2, 6, 7	details
#13	ACCEPTED	0.04 s	2, 6, 7	details
#14	ACCEPTED	0.04 s	2, 6, 7	details
#15	ACCEPTED	0.04 s	2, 6, 7	details
#16	ACCEPTED	0.27 s	3, 7	details
#17	ACCEPTED	0.32 s	3, 7	details
#18	ACCEPTED	0.36 s	3, 7	details
#19	ACCEPTED	0.29 s	3, 7	details
#20	ACCEPTED	0.30 s	3, 7	details
#21	ACCEPTED	0.27 s	3, 7	details
#22	ACCEPTED	0.29 s	3, 7	details
#23	ACCEPTED	0.28 s	3, 7	details
#24	ACCEPTED	0.41 s	4, 7	details
#25	ACCEPTED	0.39 s	4, 7	details
#26	ACCEPTED	0.61 s	4, 7	details
#27	ACCEPTED	0.21 s	4, 7	details
#28	ACCEPTED	0.48 s	4, 7	details
#29	ACCEPTED	0.45 s	4, 7	details
#30	ACCEPTED	0.05 s	5, 6, 7	details
#31	ACCEPTED	0.05 s	5, 6, 7	details
#32	ACCEPTED	0.05 s	5, 6, 7	details
#33	ACCEPTED	0.05 s	5, 6, 7	details
#34	ACCEPTED	0.04 s	5, 6, 7	details
#35	ACCEPTED	0.05 s	5, 6, 7	details
#36	ACCEPTED	0.05 s	6, 7	details
#37	ACCEPTED	0.05 s	6, 7	details
#38	ACCEPTED	0.05 s	6, 7	details
#39	ACCEPTED	0.05 s	6, 7	details
#40	ACCEPTED	0.05 s	6, 7	details
#41	ACCEPTED	0.05 s	6, 7	details
#42	ACCEPTED	0.45 s	7	details
#43	ACCEPTED	0.50 s	7	details
#44	ACCEPTED	0.47 s	7	details
#45	ACCEPTED	0.71 s	7	details
#46	ACCEPTED	0.85 s	7	details
#47	ACCEPTED	0.97 s	7	details
#48	ACCEPTED	1.13 s	7	details
#49	ACCEPTED	0.27 s	7	details
#50	ACCEPTED	0.57 s	7	details
#51	ACCEPTED	0.49 s	7	details
#52	ACCEPTED	0.04 s	1, 2, 3, 5, 6, 7	details
#53	ACCEPTED	0.04 s	1, 2, 3, 4, 5, 6, 7	details
#54	ACCEPTED	0.04 s	2, 5, 6, 7	details
#55	ACCEPTED	0.04 s	1, 2, 3, 4, 6, 7	details
#56	ACCEPTED	0.04 s	1, 2, 3, 6, 7	details
#57	ACCEPTED	0.04 s	6, 7	details
#58	ACCEPTED	0.06 s	3, 4, 7	details
#59	ACCEPTED	0.06 s	3, 7	details
#60	ACCEPTED	0.04 s	2, 6, 7	details
#61	ACCEPTED	0.04 s	2, 6, 7	details
#62	ACCEPTED	0.04 s	2, 6, 7	details
#63	ACCEPTED	0.04 s	2, 6, 7	details
#64	ACCEPTED	0.04 s	2, 6, 7	details

Code

#include<bits/stdc++.h>

using namespace std;

constexpr const int mxN = 4'000'005;

int ver[mxN], L[mxN], R[mxN];
int id = 1;

int upd(int p, int l, int r, int x) {
	if(l == r) {
		ver[id] = 1;
		return id++;
	}
	int m = (l + r) >> 1;
	int cuid = id++;
	L[cuid] = L[p], R[cuid] = R[p];
	if(m >= x) L[cuid] = upd(L[p], l, m, x);
	else R[cuid] = upd(R[p], m + 1, r, x);
	ver[cuid] = ver[L[cuid]] + ver[R[cuid]];
	return cuid;
}

int que(int p, int l, int r, int i, int j) {
	if(l >= i && r <= j) return ver[p];
	if(l > j || r < i) return 0;
	int m = (l + r) >> 1;
	return que(L[p], l, m, i, j) + que(R[p], m + 1, r, i, j);
}

pair<int, int> correct(vector<int> v, int a, int b) {
	int n = v.size();
	vector<int> st = v;
	sort(st.begin(), st.end());
	pair<int, int> ret;
	{
		vector<int> cp = v;
		int cnt = 0;
		while(cp != st) {
			if(~cnt & 1) sort(cp.begin(), cp.begin() + a);
			else sort(cp.begin() + n - b, cp.end());
			cnt++;
		}
		ret.first = cnt;
	}
	{
		vector<int> cp = v;
		int cnt = 0;
		while(cp != st) {
			if(cnt & 1) sort(cp.begin(), cp.begin() + a);
			else sort(cp.begin() + n - b, cp.end());
			cnt++;
		}
		ret.second = cnt;
	}
	return ret;
}

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	memset(ver, 0, sizeof ver);
	memset(L, 0, sizeof L);
	memset(R, 0, sizeof R);
	int n, q; cin >> n >> q;
	vector<pair<int, int>> v(n);
	vector<int> cp;
	map<int, int> mp;
	for(int i = 0; i < n; ++i) {
		int x; cin >> x;
		cp.push_back(x);
		v[i] = make_pair(x, mp[x]++);
	}
	vector<int> od(n);
	iota(od.begin(), od.end(), 0);
	sort(od.begin(), od.end(), [&](auto a, auto b) { return v[a] < v[b]; } );

	vector<int> veri = {0};
	for(int i = 0; i < n; ++i) veri.push_back(upd(veri.back(), 0, n - 1, od[i]));

	vector<int> gd(n), gdp(n), gds(n);

	for(int i = 0; i < n; ++i) gd[i] = od[i] == i;
	for(int i = 1; i < n; ++i) gd[i] += gd[i - 1];

	set<int> pf;
	for(int i = 0; i < n; ++i) {
		pf.insert(od[i]);
		gdp[i] = *pf.rbegin() == i;
	}

	auto range = [&](int l, int r, vector<int> &pf) -> int {
		return pf[r] - (l ? pf[l - 1] : 0);
	};

	// for(int a = 1; a <= n; ++a) for(int b = 1; b <= n; ++b) {
	while(q--) {
		int a, b; cin >> a >> b;
		if(gd.back() == n) {
			cout << 0 << '\n';
		}
		else if(a + b <= n) {
			if(!gdp[a - 1] || !(gdp[n - b - 1])) {
				cout << -1 << '\n';
			}
			else {
				int c = range(0, a - 1, gd), d = range(a, n - b - 1, gd), e = range(n - b, n - 1, gd);
				int ans = (c != a) + (e != b);
				if(d == n - a - b) {
					cout << ans << '\n';
				}
				else {
					cout << -1 << '\n';
				}
			}
		}
		else {
			int ans1 = 0, ans2 = 0;
			{
				int x = a - que(veri[n - b], 0, n - 1, 0, a - 1);
				int y = que(veri[a], 0, n - 1, a, n - 1);
				if(range(0, a - 1, gd) != a) x = max(x, 1);
				if(range(a, n - 1, gd) != n - a) y = max(y, 1);
				ans1 = (x + (a + b) - n - 1) / ((a + b) - n) + (y + (a + b) - n - 1) / ((a + b) - n);
			}
			{
				int x = que(veri[a], 0, n - 1, n - b, n - 1);
				int y = (n - b) - que(veri[n - b], 0, n - 1, 0, n - b - 1);
				if(range(n - b, n - 1, gd) != b) x = max(x, 1);
				if(range(0, n - b - 1, gd) != n - b) y = max(y, 1);
				ans2 = (x + (a + b) - n - 1) / ((a + b) - n) + (y + (a + b) - n - 1) / ((a + b) - n);
			}
			/*
			if(make_pair(ans1, ans2) != correct(cp, a, b)) {
				cerr << a << ' ' << b << ' ' << ans1 << ' ' << ans2 << ' ' << correct(cp, a, b).first << ' ' << correct(cp, a, b).second << '\n';
			}
			*/
			cout << min(ans1, ans2) << '\n';
		}
	}
}

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: ACCEPTED

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

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

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

Test 46

Subtask: 7

Verdict: ACCEPTED

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

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

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

Test 47

Subtask: 7

Verdict: ACCEPTED

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

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

user output
`3 33 3 3 3 ...` view save

Test 48

Subtask: 7

Verdict: ACCEPTED

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

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

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

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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