CSES - BOI 2026 Mirror Day 2

Submission details
Task:	Distances
Sender:	Juan_Alejandro
Submission time:	2026-04-17 20:05:56 +0300
Language:	C++ (C++20)
Status:	READY
Result:	0

Feedback
subtask	verdict	score
#1	WRONG ANSWER	0
#2	WRONG ANSWER	0
#3	WRONG ANSWER	0
#4	WRONG ANSWER	0
#5	WRONG ANSWER	0
#6	WRONG ANSWER	0

Test results
test	verdict	subtask
#1	ACCEPTED	1, 4, 6	details
#2	ACCEPTED	1, 2, 3, 4, 5, 6	details
#3	ACCEPTED	1, 3, 4, 5, 6	details
#4	ACCEPTED	1, 2, 4, 6	details
#5	ACCEPTED	1, 3, 4, 5, 6	details
#6	ACCEPTED	1, 4, 6	details
#7	ACCEPTED	1, 4, 6	details
#8	ACCEPTED	1, 2, 4, 6	details
#9	ACCEPTED	1, 3, 4, 5, 6	details
#10	ACCEPTED	1, 4, 5, 6	details
#11	ACCEPTED	1, 4, 6	details
#12	ACCEPTED	1, 4, 6	details
#13	ACCEPTED	1, 4, 6	details
#14	WRONG ANSWER	1, 6	details
#15	WRONG ANSWER	1, 2, 6	details
#16	ACCEPTED	4, 6	details
#17	ACCEPTED	4, 6	details
#18	ACCEPTED	3, 4, 5, 6	details
#19	WRONG ANSWER	4, 5, 6	details
#20	ACCEPTED	4, 5, 6	details
#21	WRONG ANSWER	5, 6	details
#22	WRONG ANSWER	5, 6	details
#23	WRONG ANSWER	2, 6	details
#24	WRONG ANSWER	3, 4, 5, 6	details
#25	WRONG ANSWER	4, 5, 6	details
#26	WRONG ANSWER	4, 5, 6	details
#27	WRONG ANSWER	5, 6	details
#28	WRONG ANSWER	5, 6	details
#29	WRONG ANSWER	2, 6	details
#30	WRONG ANSWER	3, 4, 5, 6	details
#31	ACCEPTED	4, 5, 6	details
#32	WRONG ANSWER	4, 5, 6	details
#33	WRONG ANSWER	4, 5, 6	details
#34	WRONG ANSWER	5, 6	details
#35	WRONG ANSWER	5, 6	details
#36	WRONG ANSWER	5, 6	details
#37	WRONG ANSWER	6	details
#38	WRONG ANSWER	6	details
#39	WRONG ANSWER	2, 6	details
#40	WRONG ANSWER	6	details
#41	WRONG ANSWER	6	details
#42	WRONG ANSWER	6	details
#43	WRONG ANSWER	6	details
#44	WRONG ANSWER	6	details

Compiler report

input/code.cpp: In function 'bool asdd(long long int, long long int, std::vector<std::pair<long long int, long long int> >&)':
input/code.cpp:11:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for(int k=0;k<x.size();k++)
      |                 ~^~~~~~~~~
input/code.cpp: In function 'bool asddd(long long int, long long int, std::vector<std::pair<long long int, long long int> >&)':
input/code.cpp:25:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for(int k=0;k<x.size();k++)
      |                 ~^~~~~~~~~
input/code.cpp:24:9: warning: unused variable 'c' [-Wunused-variable]
   24 |     int c=0;
      |         ^
input/code.cpp: In function 'int32_t main()':...

Code

#include <bits/stdc++.h>
#define int long long 
#define endl " \n"
#define vec vector 
#define all(x) x.begin(),x.end()
#pragma GCC optimize("O2,unroll-loops")
using namespace std;
bool asdd(int i,int j,vec<pair<int,int>> &x)
{
    int c=0;
    for(int k=0;k<x.size();k++)
    {
        if(x[k].first-i==0||x[k].second-j==0)
        {
            c++;
        }
    }
    if(c>1)
    return 1;else
    return 0;
}
bool asddd(int i,int j,vec<pair<int,int>> &x)
{
    int c=0;
    for(int k=0;k<x.size();k++)
    {
        if(x[k].first-i==0||x[k].second-j==0)
        {
            return 1;
        }
    }
    return 0;
}
int32_t main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
    int n,k;
    cin>>n>>k;int prk=k;
    if(k<=n)
    {
        int i=0,j=0,c=0;
        vec<pair<int,int>> vs;
        if(k==n){cout<<0<<" "<<-1<<endl[1];k-=2;n-=2;vs.push_back({0,-1});}
        cout<<0<<" "<<0<<endl[1];
        vs.push_back({0,0});
        j=1;
        int cc=1;
        while(c<k)
        {
            c++;
            cout<<i<<" "<<j<<endl[1];
            vs.push_back({i,j});
            while(asdd(i,j,vs)){
            if(((cc++)&1))i+=uniform_int_distribution<int>(1,1000)(rng);else
            j+=uniform_int_distribution<int>(1,1000)(rng);
            }
        }
        i=max(i,j),j=max(i,j);i++;j++;
        //cout<<i<<"a"<<j<<endl[1];
        while(c<n-1)
        {
            c++;
            while(asddd(i,j,vs)){
                i+=uniform_int_distribution<int>(1,1000)(rng);j+=uniform_int_distribution<int>(1,1000)(rng);
            }
            cout<<i<<" "<<j<<endl[1];
            vs.push_back({i,j});
        }
    }
    return 0;
}

Test details

Test 1

Subtask: 1, 4, 6

Verdict: ACCEPTED

input
`3 2` view save

correct output
`1 1 1 2 2 2` view save

user output
`0 0 0 1 648 1` view save

Test 2

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

Verdict: ACCEPTED

input
`1 0` view save

correct output
`1 0` view save

user output
`0 0` view save

Test 3

Subtask: 1, 3, 4, 5, 6

Verdict: ACCEPTED

input
`2 0` view save

correct output
`1 0 804289383 846930886` view save

user output
`0 0 2 2` view save

Test 4

Subtask: 1, 2, 4, 6

Verdict: ACCEPTED

input
`2 1` view save

correct output
`1 0 2 0` view save

user output
`0 0 0 1` view save

Test 5

Subtask: 1, 3, 4, 5, 6

Verdict: ACCEPTED

input
`3 0` view save

correct output
`1 0 804289383 846930886 681692777 714636915` view save

user output
`0 0 2 2 920 943` view save

Test 6

Subtask: 1, 4, 6

Verdict: ACCEPTED

input
`3 1` view save

correct output
`1 0 2 0 804289383 846930886` view save

user output
`0 0 0 1 433 433` view save

Test 7

Subtask: 1, 4, 6

Verdict: ACCEPTED

input
`3 2` view save

correct output
`1 1 1 2 2 2` view save

user output
`0 0 0 1 848 1` view save

Test 8

Subtask: 1, 2, 4, 6

Verdict: ACCEPTED

input
`3 3` view save

correct output
`1 0 2 0 3 0` view save

user output
`0 -1 0 0 0 1` view save

Test 9

Subtask: 1, 3, 4, 5, 6

Verdict: ACCEPTED

input
`4 0` view save

correct output
`1 0 804289383 846930886 681692777 714636915 957747793 424238335` view save

user output
`0 0 2 2 197 594 772 1164` view save

Test 10

Subtask: 1, 4, 5, 6

Verdict: ACCEPTED

input
`4 1` view save

correct output
`1 0 2 0 804289383 846930886 681692777 714636915` view save

user output
`0 0 0 1 510 510 960 1021` view save

Test 11

Subtask: 1, 4, 6

Verdict: ACCEPTED

input
`4 2` view save

correct output
`21392 0 1 0 0 510510 804289383 846930886` view save

user output
`0 0 0 1 248 1 249 249` view save

Test 12

Subtask: 1, 4, 6

Verdict: ACCEPTED

input
`4 3` view save

correct output
`1 0 2 0 3 0 804289383 846930886` view save

user output
`0 0 0 1 658 1 658 265` view save

Test 13

Subtask: 1, 4, 6

Verdict: ACCEPTED

input
`4 4` view save

correct output
`21392 0 1 0 2 0 0 510510` view save

user output
`0 -1 0 0 0 1 413 1` view save

Test 14

Subtask: 1, 6

Verdict: WRONG ANSWER

input
`4 5` view save

correct output
`21392 0 22600 0 1 0 0 510510` view save

user output
(empty)

Test 15

Subtask: 1, 2, 6

Verdict: WRONG ANSWER

input
`4 6` view save

correct output
`1 0 2 0 3 0 4 0` view save

user output
(empty)

Test 16

Subtask: 4, 6

Verdict: ACCEPTED

input
`5 5` view save

correct output
`21392 0 22600 0 1 0 0 510510 804289383 846930886` view save

user output
`0 -1 0 0 0 1 260 1 260 628` view save

Test 17

Subtask: 4, 6

Verdict: ACCEPTED

input
`6 5` view save

correct output
`21392 0 22600 0 1 0 0 510510 804289383 846930886 ...` view save

user output
`0 0 0 1 986 1 986 393 1690 393 ...` view save

Test 18

Subtask: 3, 4, 5, 6

Verdict: ACCEPTED

input
`98 0` view save

correct output
`1 0 804289383 846930886 681692777 714636915 957747793 424238335 719885386 649760492 ...` view save

user output
`0 0 2 2 941 595 1033 1434 1338 2135 ...` view save

Test 19

Subtask: 4, 5, 6

Verdict: WRONG ANSWER

input
`98 97` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
`0 0 0 1 30 1 30 224 970 224 ...` view save

Test 20

Subtask: 4, 5, 6

Verdict: ACCEPTED

input
`98 98` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
`0 -1 0 0 0 1 990 1 990 49 ...` view save

Test 21

Subtask: 5, 6

Verdict: WRONG ANSWER

input
`98 1185` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 22

Subtask: 5, 6

Verdict: WRONG ANSWER

input
`98 1188` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 23

Subtask: 2, 6

Verdict: WRONG ANSWER

input
`98 4753` view save

correct output
`1 0 2 0 3 0 4 0 5 0 ...` view save

user output
(empty)

Test 24

Subtask: 3, 4, 5, 6

Verdict: WRONG ANSWER

input
`99 0` view save

correct output
`1 0 804289383 846930886 681692777 714636915 957747793 424238335 719885386 649760492 ...` view save

user output
`0 0 2 2 636 996 1431 1311 1955 1429 ...` view save

Test 25

Subtask: 4, 5, 6

Verdict: WRONG ANSWER

input
`99 98` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
`0 0 0 1 425 1 425 433 1129 433 ...` view save

Test 26

Subtask: 4, 5, 6

Verdict: WRONG ANSWER

input
`99 99` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
`0 -1 0 0 0 1 298 1 298 20 ...` view save

Test 27

Subtask: 5, 6

Verdict: WRONG ANSWER

input
`99 1201` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 28

Subtask: 5, 6

Verdict: WRONG ANSWER

input
`99 1212` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 29

Subtask: 2, 6

Verdict: WRONG ANSWER

input
`99 4851` view save

correct output
`1 0 2 0 3 0 4 0 5 0 ...` view save

user output
(empty)

Test 30

Subtask: 3, 4, 5, 6

Verdict: WRONG ANSWER

input
`100 0` view save

correct output
`1 0 804289383 846930886 681692777 714636915 957747793 424238335 719885386 649760492 ...` view save

user output
`0 0 2 2 398 477 1228 1154 1703 1554 ...` view save

Test 31

Subtask: 4, 5, 6

Verdict: ACCEPTED

input
`100 1` view save

correct output
`1 0 2 0 804289383 846930886 681692777 714636915 957747793 424238335 ...` view save

user output
`0 0 0 1 958 958 1504 1558 1892 1616 ...` view save

Test 32

Subtask: 4, 5, 6

Verdict: WRONG ANSWER

input
`100 5` view save

correct output
`21392 0 22600 0 1 0 0 510510 804289383 846930886 ...` view save

user output
`0 0 0 1 99 1 99 533 263 533 ...` view save

Test 33

Subtask: 4, 5, 6

Verdict: WRONG ANSWER

input
`100 100` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
`0 -1 0 0 0 1 6 1 6 449 ...` view save

Test 34

Subtask: 5, 6

Verdict: WRONG ANSWER

input
`100 1000` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 35

Subtask: 5, 6

Verdict: WRONG ANSWER

input
`100 1232` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 36

Subtask: 5, 6

Verdict: WRONG ANSWER

input
`100 1237` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 37

Subtask: 6

Verdict: WRONG ANSWER

input
`100 2222` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 38

Subtask: 6

Verdict: WRONG ANSWER

input
`100 3395` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 39

Subtask: 2, 6

Verdict: WRONG ANSWER

input
`100 4950` view save

correct output
`1 0 2 0 3 0 4 0 5 0 ...` view save

user output
(empty)

Test 40

Subtask: 6

Verdict: WRONG ANSWER

input
`100 4949` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 41

Subtask: 6

Verdict: WRONG ANSWER

input
`100 4948` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 42

Subtask: 6

Verdict: WRONG ANSWER

input
`100 4930` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 43

Subtask: 6

Verdict: WRONG ANSWER

input
`100 4920` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

Test 44

Subtask: 6

Verdict: WRONG ANSWER

input
`100 4900` view save

correct output
`21392 0 22600 0 30056 0 34848 0 38584 0 ...` view save

user output
(empty)

BOI 2026 Mirror Day 2

Distances

Compiler report

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

Tasks

Submissions (Juan_Alejandro)