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#1508. 【CSP七连测Day1】上海

https://sjzezoj.com/submission/56127
This commit is contained in:
Baoshuo Ren 2022-09-09 11:47:35 +08:00
parent 237c953596
commit b11f436570
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
22 changed files with 120 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <cmath>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e6 + 5;
long long k, _k, cnt, p[N], c[N], ans = 1;
bool flag;
long long binpow(long long a, long long b) {
long long res = 1;
while (b) {
if (b & 1) res *= a;
a *= a;
b >>= 1;
}
return res;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> k;
_k = k;
for (long long i = 2; i * i <= k; i++) {
if (k % i == 0) {
p[++cnt] = i;
while (k % i == 0) {
k /= i;
c[cnt]++;
}
}
}
if (k) {
p[++cnt] = k;
c[cnt] = 1;
}
for (int i = 1; i <= cnt; i++) {
ans *= binpow(p[i], static_cast<long long>(std::ceil(static_cast<long double>(c[i]) / 2)));
}
cout << (ans % _k ? ans : -1) << endl;
return 0;
}

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