CSES - Datatähti 2022 alku - Results
Submission details
Task:Spiraali (Spiral)
Sender:xyrj
Submission time:2021-10-14 13:58:50
Language:C++11
Status:READY
Result:35
Feedback
groupverdictscore
#1ACCEPTED15
#2ACCEPTED20
#30
Test results
testverdicttimegroup
#1ACCEPTED0.01 s1details
#2ACCEPTED0.01 s2details
#30.01 s3details

Code

#include <iostream>

using namespace std;

typedef long long ull;

ull hae(ull n, ull y, ull x)
{
    ull vasen = x;
    ull ala = n - y + 1;
    ull oikea = n - x + 1;
    ull yla = y;

    ull r = min(vasen, min(ala, min(oikea, yla)));

    // cout << "r " << r << "\n";

    // ull tulos = (ull)((r - 1) * ((-4 * (2 * 1 - n - 1) - 4 * (2 * (r - 1) - n - 1)) / 2)) % (ull)(1e9 + 7);
    ull tulos = (ull)(-4 * (r - 1) * ((r - 1) - n)) % (ull)(1e9 + 7);

    if (r == vasen)
    {
        tulos = (tulos + (y - r + 1)) % (ull)(1e9 + 7);
        return tulos;
    }

    tulos = (tulos + n - 2 * (r - 1)) % (ull)(1e9 + 7);

    if (r == ala)
    {
        tulos = tulos + (x - r) % (ull)(1e9 + 7);
        return tulos;
    }

    tulos = (tulos + n - 2 * (r - 1)) % (ull)(1e9 + 7);

    if (r == oikea)
    {
        // cout << "Korkeus " << (n - 2 * (r - 1)) << "    (y - r) " << (y - r + 1) << "\n";
        tulos = (tulos + (n - 2 * (r - 1)) - (y - r + 1) - 1) % (ull)(1e9 + 7);
        return tulos;
    }

    tulos = (tulos + n - 2 * (r - 1)) % (ull)(1e9 + 7);

    if (r == yla)
    {
        tulos = (tulos + (n - 2 * (r - 1)) - (x - r + 1) - 2) % (ull)(1e9 + 7);
        return tulos;
    }

    return tulos;
}

int main()
{
    ull n, t;
    cin >> n >> t;

    for (int i = 0; i < t; i++)
    {
        ull y, x;
        cin >> y >> x;
        cout << hae(n, y, x) << "\n";
    }
}

Test details

Test 1

Group: 1

Verdict: ACCEPTED

input
10 100
1 1
1 2
1 3
1 4
...

correct output
1
36
35
34
33
...

user output
1
36
35
34
33
...

Test 2

Group: 2

Verdict: ACCEPTED

input
1000 1000
371 263
915 322
946 880
53 738
...

correct output
773533
312166
206053
200080
593922
...

user output
773533
312166
206053
200080
593922
...

Test 3

Group: 3

Verdict:

input
1000000000 1000
177757853 827347032
409613589 419171337
739269360 256524697
328695530 896842209
...

correct output
571375684522141210
967321186816598569
762879105851175000
370065046779516790
936897883750373771
...

user output
522511450
45350309
511021300
189061482
192088632
...