CSES - Datatähti 2025 loppu

Submission details
Task:	Piiri
Sender:	vgtcross
Submission time:	2025-01-18 13:50:19 +0200
Language:	C++ (C++20)
Status:	READY
Result:	100

Feedback
group	verdict	score
#1	ACCEPTED	14
#2	ACCEPTED	12
#3	ACCEPTED	26
#4	ACCEPTED	48

Test results
test	verdict	time	group
#1	ACCEPTED	0.02 s	1, 2, 4	details
#2	ACCEPTED	0.02 s	1, 2, 4	details
#3	ACCEPTED	0.02 s	1, 2, 4	details
#4	ACCEPTED	0.01 s	1, 2, 4	details
#5	ACCEPTED	0.02 s	1, 2, 4	details
#6	ACCEPTED	0.02 s	1, 2, 4	details
#7	ACCEPTED	0.01 s	1, 2, 4	details
#8	ACCEPTED	0.01 s	1, 2, 4	details
#9	ACCEPTED	0.02 s	1, 2, 4	details
#10	ACCEPTED	0.01 s	2, 4	details
#11	ACCEPTED	0.01 s	2, 4	details
#12	ACCEPTED	0.02 s	2, 4	details
#13	ACCEPTED	0.01 s	2, 4	details
#14	ACCEPTED	0.02 s	2, 4	details
#15	ACCEPTED	0.02 s	2, 4	details
#16	ACCEPTED	0.02 s	2, 4	details
#17	ACCEPTED	0.04 s	3	details
#18	ACCEPTED	0.04 s	3	details
#19	ACCEPTED	0.03 s	3	details
#20	ACCEPTED	0.02 s	3	details
#21	ACCEPTED	0.01 s	3	details
#22	ACCEPTED	0.11 s	4	details
#23	ACCEPTED	0.08 s	4	details
#24	ACCEPTED	0.07 s	4	details
#25	ACCEPTED	0.11 s	4	details
#26	ACCEPTED	0.03 s	4	details
#27	ACCEPTED	0.04 s	4	details
#28	ACCEPTED	0.06 s	4	details

Code

#include <bits/stdc++.h>

#define debug(x) cout << #x << ": " << x << endl
#define fi first
#define se second
#define all(x) begin(x),end(x)
#define rall(x) rbegin(x),rend(x)

using namespace std;
using ll = long long;

string ask(string s) {
    cout << "? " << s << endl;
    string t;
    cin >> t;
    return t;
}

void find_fail(string s, string p) {
    if (count(all(s), '1') < count(all(p), '1')) {
        int j = 0;
        while (true) {
            while (s[j] == '1') ++j;
            s[j] = '1';
            string t = ask(s);
            if (t == p) {
                cout << "YES\n";
                cout << s << '\n';
                s[j] = '0';
                cout << s << endl;
                return;
            }
            p = t;
            ++j;
        }
    } else {
        int j = 0;
        while (true) {
            while (s[j] == '0') ++j;
            s[j] = '0';
            string t = ask(s);
            if (t == p) {
                cout << "YES\n";
                cout << s << '\n';
                s[j] = '1';
                cout << s << endl;
                return;
            }
            p = t;
            ++j;
        }
    }
}

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

    string s(n, '0');
    vector<int> v(m, -1);
    for (int i = 0; i < n; ++i) {
        s[i] = '1';
        string t = ask(s);
        if (count(all(t), '1') != 1) {
            find_fail(s, t);
            return;
        }
        int j = t.find('1');
        if (v[j] != -1) {
            cout << "YES\n";
            cout << s << '\n';
            s[i] = '0';
            s[v[j]] = '1';
            cout << s << endl;
            return;
        }
        v[j] = i;
        s[i] = '0';
    }

    s = string(n, '1');
    for (int i = 0; i < n; ++i) {
        s[i] = '0';
        string t = ask(s);
        if (count(all(t), '0') != 1) {
            find_fail(s, t);
            return;
        }
        s[i] = '1';
    }

    cout << "NO\n";
}

int main() {
    cin.tie(0) -> sync_with_stdio(0);

    solve();
}

Test details

Test 1

Group: 1, 2, 4

Verdict: ACCEPTED

input
`2 2 NO 1 2` view save

correct output
(empty)

user output
`2 2 ? 10 10 ? 01 01 ...` view save

Error:

1 1 100 0

Test 2

Group: 1, 2, 4

Verdict: ACCEPTED

input
`2 2 YES 1 2 conj 2 1 1` view save

correct output
(empty)

user output
`2 2 ? 10 10 ? 01 00 ...` view save

Error:

1 1 100 0

Test 3

Group: 1, 2, 4

Verdict: ACCEPTED

input
`10 10 NO 6 2 1 8 3 9 4 10 5 7` view save

correct output
(empty)

user output
`10 10 ? 1000000000 0010000000 ? 0100000000 0100000000 ...` Truncated

Error:

1 1 100 0

Test 4

Group: 1, 2, 4

Verdict: ACCEPTED

input
`10 10 YES 6 10 2 3 9 8 4 5 7 1 disj 2 2 7 3` view save

correct output
(empty)

user output
`10 10 ? 1000000000 0000000001 ? 0100000000 0010000000 ...` Truncated

Error:

1 1 100 0

Test 5

Group: 1, 2, 4

Verdict: ACCEPTED

input
`10 10 YES 8 4 9 10 6 3 7 2 1 5 disj 1 5 2 9 1 4 3` view save

correct output
(empty)

user output
`10 10 ? 1000000000 0000000010 ? 0100000000 0000000100 ...` Truncated

Error:

1 1 100 0

Test 6

Group: 1, 2, 4

Verdict: ACCEPTED

input
`10 10 YES 8 6 2 4 10 5 7 9 1 3 disj 9 8 3 6 2 10 8 7 9 5` view save

correct output
(empty)

user output
`10 10 ? 1000000000 0000000010 ? 0100000000 0010000000 ...` Truncated

Error:

1 1 100 0

Test 7

Group: 1, 2, 4

Verdict: ACCEPTED

input
`10 10 YES 1 2 3 5 8 6 4 9 10 7 conj 4 2 8 10` view save

correct output
(empty)

user output
`10 10 ? 1000000000 1000000000 ? 0100000000 0100000000 ...` Truncated

Error:

1 1 100 0

Test 8

Group: 1, 2, 4

Verdict: ACCEPTED

input
`10 10 YES 9 8 3 2 10 6 1 4 5 7 conj 2 5 3 1 2 7 4` view save

correct output
(empty)

user output
`10 10 ? 1000000000 0000001000 ? 0100000000 0001000000 ...` Truncated

Error:

1 1 100 0

Test 9

Group: 1, 2, 4

Verdict: ACCEPTED

input
`10 10 YES 7 1 5 8 9 4 3 6 2 10 conj 4 8 9 6 3 5 1 10 7 4` view save

correct output
(empty)

user output
`10 10 ? 1000000000 0100000000 ? 0100000000 0000000010 ...` Truncated

Error:

1 1 100 0

Test 10

Group: 2, 4

Verdict: ACCEPTED

input
`30 30 NO 17 30 6 20 28 16 7 4 14 25 18 ...` view save

correct output
(empty)

user output
`30 30 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 11

Group: 2, 4

Verdict: ACCEPTED

input
`30 30 YES 13 22 6 23 16 20 9 30 8 18 2 1...` view save

correct output
(empty)

user output
`30 30 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 12

Group: 2, 4

Verdict: ACCEPTED

input
`30 30 YES 12 30 22 9 3 7 27 21 2 28 10 1...` view save

correct output
(empty)

user output
`30 30 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 13

Group: 2, 4

Verdict: ACCEPTED

input
`30 30 YES 4 7 27 17 26 24 9 20 19 22 10 ...` view save

correct output
(empty)

user output
`30 30 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 14

Group: 2, 4

Verdict: ACCEPTED

input
`30 30 YES 7 2 24 11 4 30 17 6 9 29 5 22 ...` view save

correct output
(empty)

user output
`30 30 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 15

Group: 2, 4

Verdict: ACCEPTED

input
`30 30 YES 8 12 21 26 3 23 17 4 5 6 22 16...` view save

correct output
(empty)

user output
`30 30 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 16

Group: 2, 4

Verdict: ACCEPTED

input
`30 30 YES 8 20 19 21 24 23 25 28 5 10 13...` view save

correct output
(empty)

user output
`30 30 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 17

Group: 3

Verdict: ACCEPTED

input
`1000 999 YES 122 260 455 752 587 951 433 81...` view save

correct output
(empty)

user output
`1000 999 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 18

Group: 3

Verdict: ACCEPTED

input
`1000 999 YES 593 999 981 107 187 851 19 574...` view save

correct output
(empty)

user output
`1000 999 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 19

Group: 3

Verdict: ACCEPTED

input
`1000 999 YES 99 213 558 569 343 613 593 85 ...` view save

correct output
(empty)

user output
`1000 999 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 20

Group: 3

Verdict: ACCEPTED

input
`1000 999 YES 60 15 857 450 862 173 675 384 ...` view save

correct output
(empty)

user output
`1000 999 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 21

Group: 3

Verdict: ACCEPTED

input
`3 2 YES 3 1 disj 1 2 2 1` view save

correct output
(empty)

user output
`3 2 ? 100 01 ? 010 00 ...` view save

Error:

1 1 100 0

Test 22

Group: 4

Verdict: ACCEPTED

input
`1000 1000 NO 493 409 829 533 156 443 530 80...` view save

correct output
(empty)

user output
`1000 1000 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 23

Group: 4

Verdict: ACCEPTED

input
`1000 1000 YES 16 450 665 56 968 1 984 545 90...` view save

correct output
(empty)

user output
`1000 1000 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 24

Group: 4

Verdict: ACCEPTED

input
`1000 1000 YES 503 289 147 513 833 468 199 82...` view save

correct output
(empty)

user output
`1000 1000 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 25

Group: 4

Verdict: ACCEPTED

input
`1000 1000 YES 294 617 164 497 46 961 234 12 ...` view save

correct output
(empty)

user output
`1000 1000 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 26

Group: 4

Verdict: ACCEPTED

input
`1000 1000 YES 465 496 15 263 713 784 337 487...` view save

correct output
(empty)

user output
`1000 1000 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 27

Group: 4

Verdict: ACCEPTED

input
`1000 1000 YES 788 567 826 731 874 95 502 20 ...` view save

correct output
(empty)

user output
`1000 1000 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Test 28

Group: 4

Verdict: ACCEPTED

input
`1000 1000 YES 611 543 496 586 262 765 461 83...` view save

correct output
(empty)

user output
`1000 1000 ? 1000000000000000000000000000...` Truncated

Error:

1 1 100 0

Datatähti 2025 loppu

Piiri

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

Tasks

Submissions (vgtcross)