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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#200023#5141. Identical ParityPHarr#WA 11ms3608kbC++201.8kb2023-10-04 15:07:442023-10-04 15:07:44

Judging History

你现在查看的是最新测评结果

  • [2023-10-04 15:07:44]
  • 评测
  • 测评结果:WA
  • 用时:11ms
  • 内存:3608kb
  • [2023-10-04 15:07:44]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std;

#define int long long

using vi = vector<int>;
using db = long double;

constexpr int inf = 1E18;


int exgcd(int a, int b, int &x, int &y) {
    if (b == 0) {
        x = 1, y = 0;
        return a;
    }
    int d = exgcd(b, a % b, x, y);
    int z = x;
    x = y;
    y = z - y * (a / b);
    return d;
}

//int n , k = 11;
void solve() {
    int n, k;
    cin >> n >> k;
//    cout << n << " :  ";
    if (n == k and n == 1) {
        cout << "Yes\n";
        return;
    }
    if (k % 2 == 0) {
        cout << "Yes\n";
        return;
    }
    if (n > k * 10) {
        cout << "No\n";
        return;
    }
    if (k == 1) {
        cout << "No\n";
        return;
    }

    int a = n / k, b = (n + k - 1) / k, c = n / 2, x0, y0, d;
    d = exgcd(a, b, x0, y0);
    if (c % d != 0) {
        cout << "No\n";
        return;
    }
    int x = c / d * x0, y = c / d * y0, dx = b / d, dy = a / d;
    {
        int kk = (-x) / dx;
        x = x + kk * dx, y = y - kk * dy;
    }
    for (; y >= 0; x += dx, y -= dy) {
        if (x < 0) continue;
        if (n % k != 0 and x + y <= k and x <= k - n % k and y <= n % k) {
//                    cout << a << " * " << x << " + " << b << " * " << y << " = " << c << "\n";
            cout << "Yes\n";
            return;
        } else if (n % k == 0 and x + y <= k and min(x, y) == 0) {
//                    cout << a << " * " << x << " + " << b << " * " << y << " = " << c << "\n";
            cout << "Yes\n";
            return;
        }
    }
    cout << "No\n";


    return;
}

int32_t main() {
    ios::sync_with_stdio(false), cin.tie(nullptr);
    int TC;
//    n = k;
    for (cin >> TC; TC; TC--)
        solve();
    return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 1ms
memory: 3372kb

input:

3
3 1
4 2
5 3

output:

No
Yes
Yes

result:

ok 3 token(s): yes count is 2, no count is 1

Test #2:

score: -100
Wrong Answer
time: 11ms
memory: 3608kb

input:

100000
1 1
2 1
2 2
3 1
3 2
3 3
4 1
4 2
4 3
4 4
5 1
5 2
5 3
5 4
5 5
6 1
6 2
6 3
6 4
6 5
6 6
7 1
7 2
7 3
7 4
7 5
7 6
7 7
8 1
8 2
8 3
8 4
8 5
8 6
8 7
8 8
9 1
9 2
9 3
9 4
9 5
9 6
9 7
9 8
9 9
10 1
10 2
10 3
10 4
10 5
10 6
10 7
10 8
10 9
10 10
11 1
11 2
11 3
11 4
11 5
11 6
11 7
11 8
11 9
11 10
11 11
12 1
...

output:

Yes
No
Yes
No
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes...

result:

wrong answer expected YES, found NO [19720th token]