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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
#738458#9622. 有限小数qzhfxTL 0ms0kbC++231.8kb2024-11-12 19:07:312024-11-12 19:07:34

Judging History

你现在查看的是最新测评结果

  • [2024-11-12 19:07:34]
  • 评测
  • 测评结果:TL
  • 用时:0ms
  • 内存:0kb
  • [2024-11-12 19:07:31]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 1e6 + 7;
const int mod = 998244353;
const int L = 1e9;
// #define ll __int128
//求解不定方程 ax+by=c 的最小整数解 x
ll exgcd(ll a, ll b, ll &x, ll &y)
{
    if (!b) {x = 1; y = 0; return a;}
    ll ans = exgcd(b, a % b, x, y);
    ll tmp = x;
    x = y;
    y = tmp - a / b * y;
    return ans;
}
ll x, y;
ll cal(ll a, ll b, ll c)
{
    x = 0, y = 0;
    ll ans = exgcd(a, b, x, y);
    if (c % ans)return -1;
    x *= c / ans; b /= ans;
    // y *= c / ans;
    if (b < 0)b = -b;
    x = (x % b + b) % b;
    return x;
}
    std::vector<ll> px;
void solve()
{
    int a, b;
    cin >> a >> b;
    ll p = b, k = 1;
    while (p % 2 == 0) {
        p /= 2;
        k *= 2;
    }
    while (p % 5 == 0) {
        p /= 5;
        k *= 5;
    }
    long long c = 1e18, t = 0;
    auto check = [&](ll id) {
        c = cal(k, a, p * id);
        // cerr << c << "\n";
        t = (id*p - 1ll * k * c) / a;
        return t >= 1;
    };
    ll d = 1;
    ll cx = 1e18,ct = 0;
    for(auto pd:px){
        ll s = pd * k;
        check(s);
        if(c >=0&&cx > c){
            cx = c;
            d = pd;
        }
    }
    cout << cx << " " << d << '\n';
}
int main()
{
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    px.push_back(1);
    for(int i=0;;i++){
        ll now = 1;
        int x = i;
        while(x --){
            now *= 2;
        } 
        if(now > L)break;
        for(int j=0;;j++){
            int y = j;
            while(y--){
                now *= 5;
            }
            px.push_back(now);
        }
    }
    int _ = 1;
    cin >> _;
    while (_--)
        solve();
    return 0;
}

详细

Test #1:

score: 0
Time Limit Exceeded

input:

4
1 2
2 3
3 7
19 79

output:


result: