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BOI 2026 Mirror Day 2

Sort

  • Start: 2026-04-17 10:00:00
  • End: 2026-04-17 15:00:00
Submission details
Task:Sort
Sender:Diego_09
Submission time:2026-04-17 14:30:23 +0300
Language:C++ (C++17)
Status:READY
Result:6
Feedback
subtaskverdictscore
#1ACCEPTED6
#20
#30
#40
#50
#60
#70
Test results
testverdicttimesubtask
#1ACCEPTED0.00 s2, 6, 7details
#2ACCEPTED0.00 s1, 2, 3, 6, 7details
#3ACCEPTED0.00 s2, 6, 7details
#4ACCEPTED0.00 s1, 2, 3, 6, 7details
#5ACCEPTED0.00 s1, 2, 3, 6, 7details
#6ACCEPTED0.00 s1, 2, 3, 6, 7details
#7ACCEPTED0.00 s1, 2, 3, 6, 7details
#8ACCEPTED0.00 s1, 2, 3, 6, 7details
#9ACCEPTED0.00 s1, 2, 3, 6, 7details
#10ACCEPTED0.00 s1, 2, 3, 6, 7details
#11ACCEPTED0.00 s2, 6, 7details
#120.00 s2, 6, 7details
#130.00 s2, 6, 7details
#14ACCEPTED0.00 s2, 6, 7details
#150.00 s2, 6, 7details
#16--3, 7details
#17--3, 7details
#18--3, 7details
#19--3, 7details
#20--3, 7details
#21--3, 7details
#22--3, 7details
#23--3, 7details
#24--4, 7details
#25--4, 7details
#26--4, 7details
#27--4, 7details
#28--4, 7details
#29--4, 7details
#300.50 s5, 6, 7details
#310.66 s5, 6, 7details
#320.67 s5, 6, 7details
#331.93 s5, 6, 7details
#34ACCEPTED0.42 s5, 6, 7details
#350.87 s5, 6, 7details
#360.75 s6, 7details
#370.82 s6, 7details
#381.98 s6, 7details
#391.94 s6, 7details
#40ACCEPTED0.51 s6, 7details
#410.86 s6, 7details
#42--7details
#43--7details
#44--7details
#45--7details
#46--7details
#47--7details
#48--7details
#49--7details
#50--7details
#51--7details
#52ACCEPTED0.00 s1, 2, 3, 5, 6, 7details
#53ACCEPTED0.00 s1, 2, 3, 4, 5, 6, 7details
#54ACCEPTED0.00 s2, 5, 6, 7details
#55ACCEPTED0.00 s1, 2, 3, 4, 6, 7details
#56ACCEPTED0.00 s1, 2, 3, 6, 7details
#570.00 s6, 7details
#58ACCEPTED0.17 s3, 4, 7details
#59ACCEPTED0.22 s3, 7details
#600.00 s2, 6, 7details
#610.00 s2, 6, 7details
#62ACCEPTED0.00 s2, 6, 7details
#63ACCEPTED0.00 s2, 6, 7details
#640.00 s2, 6, 7details

Compiler report

input/code.cpp: In function 'void set_io(std::string)':
input/code.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen((name+".in").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input/code.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen((name+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Code

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#if defined(__has_include)&&__has_include("custom_h/debugging.h")
#define local_run 1
#include "custom_h\debugging.h"
#else 
#define local_run 0
#endif
// #pragma GCC target ("avx2");
// #pragma GCC optimize ("Ofast");
#define rall(v) v.rbegin(),v.rend()
#define all(v) v.begin(),v.end()
#define keyval find_by_order
#define valkey order_of_key
#define int long long
#define pb push_back
#define s second
#define f first

using namespace __gnu_pbds; 
using namespace std;
template<typename T>
using oset=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
template<typename T>
using omset=tree<T,null_type,less_equal<T>,rb_tree_tag,tree_order_statistics_node_update>;
    
void set_io(string name=""){
    ios_base::sync_with_stdio(0);cin.tie(0);
    if(name.size() and !local_run){
        freopen((name+".in").c_str(),"r",stdin);
        freopen((name+".out").c_str(),"w",stdout);
    }
}

const int my[]={0,0,1,-1,1,1,-1,-1};
const int mx[]={1,-1,0,0,1,-1,-1,1};
const int md=1e9+7;
const int oo=1e18;

void solve(){
    int n,q;
    cin>>n>>q;

    vector<int>v(n+1,0),s(n+1,0);
    for(int i=1;i<=n;i++)cin>>v[i];

    s=v;
    sort(all(s));

    while(q--){
        int a,b,xl=0,xr=0;
        cin>>a>>b;

        vector<int>aux=v;

        vector<int>l={0};
        for(int i=1;i<=a;i++)l.pb(aux[i]);
        sort(all(l));
        for(int i=1;i<=a;i++){
            if(aux[i]!=l[i]){
                xl=1;
                aux[i]=l[i];
            }
        }

        vector<int>r={0};
        for(int i=n-b+1;i<=n;i++)r.pb(aux[i]);
        sort(all(r));
        for(int i=n-b+1;i<=n;i++){
            if(aux[i]!=r[i+b-n]){
                xr=1;
                aux[i]=r[i+b-n];
            }
        }

        // cerr<<l<<" "<<r<<" "<<aux<<"\n";

        if(aux==s){
            cout<<xl+xr<<"\n";
        }else{
            cout<<"-1\n";
        }
    }
}

int32_t main(){set_io("");
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
}

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:

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

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

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

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

Test 13

Subtask: 2, 6, 7

Verdict:

input
10 10
893310183 811950921 338863962 ...
view save

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

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

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

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:

input
10 10
509019662 983949268 960017302 ...
view save

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

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

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

Test 16

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 17

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 18

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 19

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 20

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 21

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 22

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 23

Subtask: 3, 7

Verdict:

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

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

user output
(empty)

Test 24

Subtask: 4, 7

Verdict:

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:

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:

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:

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:

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:

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:

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
2
1
-1
1
-1
...
view save

Feedback: Incorrect character on line 1 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...
view save

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

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

Feedback: Incorrect character on line 14 col 1: expected "3", got "-1"

Test 32

Subtask: 5, 6, 7

Verdict:

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

Feedback: Incorrect character on line 116 col 1: expected "1", got "2"

Test 33

Subtask: 5, 6, 7

Verdict:

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

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

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

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

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:

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

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

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

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...
view save

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

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

Feedback: Incorrect character on line 7 col 1: expected "3", got "-1"

Test 37

Subtask: 6, 7

Verdict:

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

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

Test 38

Subtask: 6, 7

Verdict:

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

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

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

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

Test 39

Subtask: 6, 7

Verdict:

input
5000 5000
266174928 446601941 191252234 ...
view save

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

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

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

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:

input
5000 5000
999767052 998555066 997822810 ...
view save

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

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

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

Test 42

Subtask: 7

Verdict:

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:

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:

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:

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:

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:

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:

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:

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:

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:

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: 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:

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

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

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

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

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:

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

Feedback: Incorrect character on line 8 col 1: expected "1", got "2"

Test 61

Subtask: 2, 6, 7

Verdict:

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

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

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

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

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:

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

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

Tasks

A Distances-B Hamilton-C Sort-

Submissions (Diego_09)

2026-04-17 14:30:23 62026-04-17 14:22:01 02026-04-17 14:21:29