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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#814583 | #9622. 有限小数 | kiana810 | WA | 0ms | 3804kb | C++14 | 1.5kb | 2024-12-14 18:37:51 | 2024-12-14 18:37:51 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int T;
ll a, b, c, d;
int cp2, cp5;
ll ip2, ip5;
void exgcd(ll a, ll b, ll &x, ll &y) {
if (!b) {
x = 1ll;
y = 0ll;
return;
}
exgcd(b, a%b, x, y);
ll t = x;
x = y;
y = t - a / b * y;
}
ll inv(ll a, ll p) {
ll x, y;
exgcd(a, p, x, y);
x = (x % p + p) % p;
return x;
}
int main() {
scanf("%d", &T);
while (T--) {
scanf("%lld%lld", &a, &b);
cp2 = cp5 = 0;
for (; b % 2 == 0; b /= 2, cp2++);
for (; b % 5 == 0; b /= 5, cp5++);
if (b == 1) {
puts("0 1");
continue;
}
ip2 = ip5 = 1ll;
for (int i = 0; i < cp2; i++, ip2 *= inv(2, b));
for (int i = 0; i < cp5; i++, ip5 *= inv(5, b));
c = 1e9 + 1ll;
for (int i = 0; i < 35; i++) {
for (int j = 0; j < 15; j++) {
ll tmp = (-a % b + b) % b, tmp2 = b;
for (int k = 0; (k < i) && (tmp2 <= 1e9); k++, tmp2 *= 2);
for (int k = 0; (k < i) && (tmp2 <= 1e9); k++, tmp2 *= 5);
if (tmp2 > 1e9) continue;
for (int k = 0; k < i; k++, tmp *= 2, tmp %= b);
for (int k = 0; k < j; k++, tmp *= 5, tmp %= b);
if (tmp < c) {
c = tmp;
d = tmp2;
}
}
}
printf("%lld %lld\n", c, d);
}
return 0;
}
Details
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Test #1:
score: 0
Wrong Answer
time: 0ms
memory: 3804kb
input:
4 1 2 2 3 3 7 19 79
output:
0 1 1 3 1 7 3 7900
result:
wrong answer The result is not terminating.(Testcase 3)