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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#756723#5141. Identical ParityPHarrWA 13ms3720kbC++231.1kb2024-11-16 21:42:002024-11-16 21:42:01

Judging History

你现在查看的是最新测评结果

  • [2024-11-16 21:42:01]
  • 评测
  • 测评结果:WA
  • 用时:13ms
  • 内存:3720kb
  • [2024-11-16 21:42:00]
  • 提交

answer

#include<bits/stdc++.h>

using namespace std;

using i32 = int32_t;
using i64 = long long;

#define int i64
using vi = vector<int>;
using pii = pair<int, int>;

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, y, x);
    y -= a / b * x;
    return d;
}

void solve() {
    int n, k;
    cin >> n >> k;
    int m = (n + 1) / 2;
    int a = (n + k - 1) / k, b = n / k;
    int p = n % k, q = k - p; // p is max x, q is max y

    int x, y;
    int d = exgcd(a, b, x, y);
    if (m % d != 0) {
        cout << "No\n";
        return;
    }
    x = x * m / d, y = y * m / d;
    int dx = b / d, dy = a / d;

    x = (x % dx + dx) % dx, y = (m - a * x) / b;
    while (x <= q) {
        if (0 <= y and y <= q) {
            cout << "Yes\n";
            return;
        }
        x += dx, y -= dy;
    }
    cout << "No\n";
    return;
}

i32 main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int T;
    cin >> T;
    while (T--)
        solve();

    return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3596kb

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: 13ms
memory: 3720kb

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

result:

wrong answer expected YES, found NO [25th token]