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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#763948#9622. 有限小数lonelywolfWA 26ms3660kbC++201.5kb2024-11-19 22:57:342024-11-19 22:57:37

Judging History

你现在查看的是最新测评结果

  • [2024-11-19 22:57:37]
  • 评测
  • 测评结果:WA
  • 用时:26ms
  • 内存:3660kb
  • [2024-11-19 22:57:34]
  • 提交

answer

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

#define int long long

int exgcd(int a, int b, int &x, int &y)
{
    if (!b)
    {
        x = 1, y = 0;
        return a;
    }
    int g = exgcd(b, a % b, y, x);
    y -= a / b * x;
    return g;
}
// ax + by = c, 可求解线性同余方程 ax === b (mod c)
bool liEu(int a, int b, int c, int &x, int &y)
{
    int d = exgcd(a, b, x, y);
    if (c % d != 0)
        return false;
    int k = c / d;
    x *= k;
    y *= k;
    return true;
}

const int inf = 1e9;

void solve()
{
    int a, b;
    cin >> a >> b;

    int tb = b;
    while (tb % 2 == 0)
    {
        tb /= 2;
    }
    while (tb % 5 == 0)
    {
        tb /= 5;
    }

    auto calc = [&](int d)
    {
        int z = (d * a + tb * tb - 1) / (tb * tb) * (tb * tb) - d * a;
        int x, y;
        liEu(b, tb * tb, z, x, y);
        if (x < 0)
        {
            int tx = x;
            int f = (tb * tb) / gcd(tb * tb, b);
            x += 2 * (abs(x) + f - 1) / f * f;
            x %= f;
        }
        return x;
    };

    int ans = 1e18, ansd;
    for (int i = tb; i <= inf; i *= 5)
    {
        for (int j = i; j <= inf; j *= 2)
        {
            if (ans > calc(j)) {
                ans = calc(j), ansd = j;
            }
        }
    }

    cout << ans << " " << ansd << "\n";
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }

    return 0;
}

詳細信息

Test #1:

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

input:

4
1 2
2 3
3 7
19 79

output:

0 1
1 3
1 14
3 316

result:

ok 4 case(s)

Test #2:

score: -100
Wrong Answer
time: 26ms
memory: 3660kb

input:

10000
11 12
28 53
17 60
2 35
17 181
80 123
68 141
79 163
71 99
13 64
33 61
15 32
16 61
11 86
33 74
128 143
40 53
7 23
30 31
5 6
86 181
73 91
13 23
71 81
1 2
7 38
117 160
33 83
129 151
88 153
25 58
16 19
19 141
95 124
43 96
71 139
11 59
106 109
93 152
34 43
17 99
1 57
20 159
16 25
5 73
159 170
172 17...

output:

1 3
1 54272
1 6
3 70
1 231680000
23 3936
1 36096000
5 326
1 63360
0 1
1 31232
0 1
1 4880
1 44032
1 757760
1 11714560
1 331250
1 2944
1 31
1 6
1 289600000
1 455000
1 58880
1 51840
0 1
1 304
0 1
1 415
1 19328000
1 765000000
1 4640
1 608
1 72192
24 6200
1 3
3 347500
1 944
1 43600
1 76
1 1761280
1 6336
...

result:

wrong answer Jury found better answer than participant's 1 < 3 (Testcase 4)