CSES - BOI 2026 Mirror Day 2

Submission details
Task:	Distances
Sender:	Mauricio_Cruz
Submission time:	2026-04-17 12:13:26 +0300
Language:	C++ (C++17)
Status:	READY
Result:	21

Feedback
subtask	verdict	score
#1	ACCEPTED	11
#2	ACCEPTED	4
#3	ACCEPTED	6
#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	ACCEPTED	1, 6	details
#15	ACCEPTED	1, 2, 6	details
#16	WRONG ANSWER	4, 6	details
#17	WRONG ANSWER	4, 6	details
#18	ACCEPTED	3, 4, 5, 6	details
#19	WRONG ANSWER	4, 5, 6	details
#20	WRONG ANSWER	4, 5, 6	details
#21	WRONG ANSWER	5, 6	details
#22	WRONG ANSWER	5, 6	details
#23	ACCEPTED	2, 6	details
#24	ACCEPTED	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	ACCEPTED	2, 6	details
#30	ACCEPTED	3, 4, 5, 6	details
#31	WRONG ANSWER	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	ACCEPTED	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 'void solve()':
input/code.cpp:149:28: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
  149 |             while(aa.size()<c-m){
      |                   ~~~~~~~~~^~~~
input/code.cpp:164:27: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
  164 |             while(v.size()<n){
      |                   ~~~~~~~~^~
input/code.cpp:119:14: warning: unused variable 'b' [-Wunused-variable]
  119 |         bool b=0;
      |              ^

Code

#include <bits/stdc++.h>
using namespace std;

#define rz(a,n)a.resize(n); 
#define mset multiset
#define mii map<int,int>
#define str string
#define dbl double
#define i128 __int128
#define to_string tos

#define all(x) x.begin(), x.end()

#define srtl(x)sort(all(x))
#define srtg(x)sort((x).begin(),(x).end(),greater<>())
#define rev(x) reverse(all(x))
#define lb(x,y) lower_bound(x.begin(),x.end(),y)-x.begin()
#define ub(x,y) upper_bound(x.begin(),x.end(),y)-x.begin()

#define ios ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

#define f first
#define s second
#define pb push_back
#define ins insert
#define next next_permutation(all())
#define _b __builtin_popcount

#define ve vector
#define pii pair<int,int>
#define piii pair<int,pii>
#define vi vector<int>
#define vii vector<pii>
#define viii vector<piii>
#define vvi vector<vi>
#define vst vector<string>
#define vb vector<bool>

#define pV(x)for(auto i:x)cout<<i<<" ";

#define geta(a){for(auto &i:a)cin>>i;}
#define getaa(a){for(int i=1;i<a.size();i++)cin>>a[i];}

#define fri(n)for(int i=0;i<n;i++)
#define frj(j,m)for(int j=0;j<n;j++)
#define ff(v,x,y)for(int v=x;v<y;v++)
#define Fr(n)for(int i=n-1;i>=0;i--)

#define suma(a)accumulate(a.begin(),a.end(),0LL)

#define br(x){cout<<x<<"\n";return;}
#define yesn cout<<"YES\n";

#define yes()br("YES");
#define no(){br("NO")}

#define alice() br("Alice");
#define bob() br("Bob");

#define cn continue;

#define cint const int
#define int long long


int mod=1000000007;
cint mod1=100000007;
cint mod2=998244353;

int ax[8]={0,1,0,-1,-1,1,1,-1};
int ay[8]={1,0,-1,0,1,-1,1,-1};

//bool on(int x,int y){return (x>=0&&x<n&&y>=0&&y<m);}
//int euc(int a,int b,int c,int d){return abs(a-c)+abs(b-d);}

int bp(int x,int y){
	if(y==0)return 1;
	int r=bp(x,y/2);
	return (y&1)?r*r%mod*x%mod:r*r%mod;
}
int bpm(int x,int y){
	if(y==0)return 1;
	int r=bpm(x,y/2);
	return (y&1)?r*r*x:r*r;
}

int cinn(){
	int n;
	cin>>n;
	return n;
}
#define w cinn()

bool sqr(int num){
    if(num<0)return 0;
    int sq=round(sqrtl(num));
    for(int i=max(0LL,sq-2);i<=sq+2;i++){
        if(i*i==num)return 1;
    }
    return 0;
}

double euc(int a,int b,int c,int d){return (double)sqrt(abs(a-c)*abs(a-c)+abs(b-d)*abs(b-d));}

bool num(int n){
	int cnt=0;
	int suma=0;
	for(int i=0;i<n;i+=cnt){
		cnt++;
		suma+=cnt;
	}
	if(n==suma)return 1;
	return 0;
}

void solve(){
	int n,k;
	cin>>n>>k;
	bool b=0;	
	
	if(n<=4){
		
		int l=15015;
		/*int nn=1;
		while(l*l<=200000000){
			l*=nn;
			nn++;
		}*/
	    int ll=l*l;
	    vi a;
	    for(int d=1;d<=l;d++){
	        if(ll%d==0){
	            int d2=ll/d;
	            if((d2-d)%2==0){
	                int cr=(d2-d)/2;
	                if(cr>0)a.pb(cr);
	            }
	        }
	    }
	    srtl(a);
	    
	    int c=0;
	    while(((c+1)*c/2)<=k)c++;
	    int m=k- (c*(c-1)/2);
	    
	    vii v;
	    vi aa;
	    int xd=1;
	    while(aa.size()<c-m){
	        bool b=0;
	        for(int num:a){
	            if(num==xd)b=true;
	        }
	        if(!b)aa.pb(xd);
	        xd++;
	    }
	    
	    for(int i=0;i<m;i++)v.pb({a[i],0});
	    for(int i=0;i<c-m;i++)v.pb({aa[i],0});
	    
	    if(m>0)v.pb({0,l});
	    
	    int x=1;
	    while(v.size()<n){
	        int y=(999999999)-x*7;
	        bool fl=1;
	        for(auto p:v){
	            int xx=p.f-x;
	            int yy=p.s-y;
	            //double e=euc(p.f,p.s,x,y);
	            //int ei=euc(p.f,p.s,x,y);
				if(sqr(xx*xx+yy*yy)){
	                fl=0;
	                break;
	            }
	        }
	        if(fl)v.pb({x,y});
	        x++;
	    }
	    for(auto p:v){
	        cout<<p.f<<" "<<p.s<<"\n";
	    }
		
		return;
	}
	
	if(k==((n*(n-1))/2)){
		for(int i=1;i<=n;i++){
			cout<<1<<" "<<i<<"\n";
		}
	}
	else if(k==0){
		for(int i=1;i<=n;i++){
			cout<<i<<" "<<i<<"\n";
		}
	}
	
	
	
}

int32_t main(){
	
	ios;

	int t=1;
	//cin>>t;
	
	while(t--){
		solve();
	}
	
	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
`884 0 1 0 0 15015` 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
`1 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
`1 0 2 999999985` 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
`1 0 2 0` 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
`1 0 2 999999985 3 999999978` 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
`1 0 2 0 3 999999978` 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
`884 0 1 0 0 15015` 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
`1 0 2 0 3 0` 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
`1 0 2 999999985 3 999999978 4 999999971` 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
`1 0 2 0 3 999999978 4 999999971` 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
`884 0 1 0 0 15015 2 999999985` 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
`1 0 2 0 3 0 4 999999971` 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
`884 0 1 0 2 0 0 15015` view save

Test 14

Subtask: 1, 6

Verdict: ACCEPTED

input
`4 5` view save

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

user output
`884 0 1628 0 1 0 0 15015` view save

Test 15

Subtask: 1, 2, 6

Verdict: ACCEPTED

input
`4 6` view save

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

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

Test 16

Subtask: 4, 6

Verdict: WRONG ANSWER

input
`5 5` view save

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

user output
(empty)

Test 17

Subtask: 4, 6

Verdict: WRONG ANSWER

input
`6 5` view save

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

user output
(empty)

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
`1 1 2 2 3 3 4 4 5 5 ...` 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
(empty)

Test 20

Subtask: 4, 5, 6

Verdict: WRONG ANSWER

input
`98 98` view save

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

user output
(empty)

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: ACCEPTED

input
`98 4753` view save

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

user output
`1 1 1 2 1 3 1 4 1 5 ...` view save

Test 24

Subtask: 3, 4, 5, 6

Verdict: ACCEPTED

input
`99 0` view save

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

user output
`1 1 2 2 3 3 4 4 5 5 ...` 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
(empty)

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
(empty)

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: ACCEPTED

input
`99 4851` view save

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

user output
`1 1 1 2 1 3 1 4 1 5 ...` view save

Test 30

Subtask: 3, 4, 5, 6

Verdict: ACCEPTED

input
`100 0` view save

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

user output
`1 1 2 2 3 3 4 4 5 5 ...` view save

Test 31

Subtask: 4, 5, 6

Verdict: WRONG ANSWER

input
`100 1` view save

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

user output
(empty)

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
(empty)

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
(empty)

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: ACCEPTED

input
`100 4950` view save

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

user output
`1 1 1 2 1 3 1 4 1 5 ...` view save

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 (Mauricio_Cruz)