This documentation is automatically generated by online-judge-tools/verification-helper
View the Project on GitHub ruthen71/rcpl
#define PROBLEM "https://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=NTL_1_D" #include <bits/stdc++.h> #include "math/totient.hpp" int main() { long long n; std::cin >> n; std::cout << totient(n) << '\n'; return 0; }
#line 1 "verify/aoj_ntl/aoj_ntl_1_d.test.cpp" #define PROBLEM "https://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=NTL_1_D" #include <bits/stdc++.h> #line 2 "math/totient.hpp" #line 2 "math/prime_factor.hpp" std::map<long long, int> prime_factor(long long n) { std::map<long long, int> res; for (long long i = 2; i * i <= n; i++) { while (n % i == 0) { res[i]++; n /= i; } } if (n != 1) res[n]++; return res; } #line 4 "math/totient.hpp" long long totient(long long n) { auto pf = prime_factor(n); for (auto &[p, e] : pf) { n /= p; n *= p - 1; } return n; } #line 6 "verify/aoj_ntl/aoj_ntl_1_d.test.cpp" int main() { long long n; std::cin >> n; std::cout << totient(n) << '\n'; return 0; }