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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#736750 | #9622. 有限小数 | xianggui | WA | 41ms | 3956kb | C++14 | 1.6kb | 2024-11-12 13:12:21 | 2024-11-12 13:12:21 |
Judging History
answer
#include <bits/stdc++.h>
#define int long long
using namespace std;
int exgcd(int a, int b, int &x, int &y) {
if (!b) {
x = 1, y = 0;
return a;
}
int d = exgcd(b, a % b, x, y);
int t = x;
x = y;
y = t - a / b * y;
return d;
}
// bool getans(int cur2) {
// int x, y;
// exgcd()
// }
void solve() {
int a, b;
scanf("%lld%lld", &a, &b);
int tmp = 1;
int tb = b;
while (tb % 2 == 0) {
tb /= 2;
tmp *= 2;
}
while (tb % 5 == 0) {
tb /= 5;
tmp *= 5;
}
// cerr << b << ' ' << tmp << '\n';
int cur = 1;
int ans = 1000000000, ans2 = 0;
// int
auto getans = [&tb, &b, &a](int cur2, int d) -> int {
int x, y;
int g = exgcd(b, d, x, y);
y = -y;
x *= cur2 * a / g;
y *= cur2 * a / g;
y %= b / g;
y += b / g;
y %= b / g;
return y;
};
for (int i = 0; i <= 20; ++i) {
int cur2 = cur;
for (int j = 0; j <= 20; ++j) {
int tmp2 = getans(cur2, __gcd(tmp, cur2));
if (tmp2 < ans) {
ans = tmp2;
ans2 = cur2 * b / __gcd(tmp, cur2);
}
if (cur2 * 5 * b / __gcd(tmp, cur2 * 5) > 1000000000) break;
cur2 *= 5;
}
if (cur * 2 * b / __gcd(tmp, cur * 2) > 1000000000) break;
cur *= 2;
}
printf("%lld %lld\n", ans, ans2);
}
signed main() {
int T;
scanf("%lld", &T);
while (T--) {
solve();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3956kb
input:
4 1 2 2 3 3 7 19 79
output:
0 2 1 3 1 4375 3 316
result:
ok 4 case(s)
Test #2:
score: -100
Wrong Answer
time: 41ms
memory: 3888kb
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 12 1 828125000 1 60 1 109375 1 231680000 23 960937500 1 36096000 5 326 1 63360 0 64 1 61000 0 32 1 4880 1 10750 1 18500 1 11714560 1 331250 1 898437500 1 31 1 6 1 289600000 1 455000 1 115000000 1 1265625 0 2 1 29687500 0 160 1 415 1 235937500 1 765000000 1 181250 1 2968750 1 4406250 3 24800 1 1200...
result:
wrong answer Jury found better answer than participant's 1 < 2 (Testcase 321)