CSES - Datatähti 2026 loppu

Submission details
Task:	Peli
Sender:	Nyno
Submission time:	2026-10-22 17:15:38 +0300
Language:	C++ (C++17)
Status:	READY
Result:	100

Feedback
subtask	verdict	score
#1	ACCEPTED	17
#2	ACCEPTED	38
#3	ACCEPTED	45

Test results
test	verdict	time	subtask
#1	ACCEPTED	0.00 s	1, 2, 3	details
#2	ACCEPTED	0.00 s	1, 2, 3	details
#3	ACCEPTED	0.01 s	2, 3	details
#4	ACCEPTED	0.01 s	3	details
#5	ACCEPTED	0.01 s	2, 3	details
#6	ACCEPTED	0.01 s	3	details

Code

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

int main() {
    int t;
    cin >> t;

    while (t--) {
        long long a, b;
        cin >> a >> b;

        if (a > b) swap(a, b);

        long long k = b - a;
        long long x = floor(k * (1.0 + sqrt(5.0)) / 2.0);

        if (x == a)
            cout << "second\n";
        else
            cout << "first\n";
    }
}

Test details

Test 1 (public)

Subtask: 1, 2, 3

Verdict: ACCEPTED

input
`5 2 2 1 2 3 2 4 3 ...` view save

correct output
`first second first first second` view save

user output
`first second first first second` view save

Test 2

Subtask: 1, 2, 3

Verdict: ACCEPTED

input
`100 1 1 1 2 1 3 1 4 ...` view save

correct output
`first second first first first ...` view save

user output
`first second first first first ...` view save

Test 3

Subtask: 2, 3

Verdict: ACCEPTED

input
`1000 82 14 91 84 13 97 92 23 ...` view save

correct output
`first first first first first ...` view save

user output
`first first first first first ...` view save

Test 4

Subtask: 3

Verdict: ACCEPTED

input
`1000 1630 271 1812 1671 254 1938 1827 443 ...` view save

correct output
`first first first first first ...` view save

user output
`first first first first first ...` view save

Test 5

Subtask: 2, 3

Verdict: ACCEPTED

input
`1000 36 14 79 81 93 82 32 1 ...` view save

correct output
`first first first first first ...` view save

user output
`first first first first first ...` view save

Test 6

Subtask: 3

Verdict: ACCEPTED

input
`1000 486 300 899 1455 879 543 40 65 ...` view save

correct output
`second second second second second ...` view save

user output
`second second second second second ...` view save

Datatähti 2026 loppu

Peli

Code

Test details

Test 1 (public)

Test 2

Test 3

Test 4

Test 5

Test 6

Tasks

Submissions (Nyno)