tests/aoj/totoid.eulers_phi_function.test.cpp

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Last update: 2020-10-29 22:43:21+01:00
Problem: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=NTL_1_D

Depends on

Code

#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=NTL_1_D"

#include "../../code/math/totoid.cc"

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);

  ll n;
  cin >> n;
  cout << phi(n) << endl;
}

#line 1 "tests/aoj/totoid.eulers_phi_function.test.cpp"
#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=NTL_1_D"

#line 1 "code/template.cc"
// this line is here for a reason
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
#define fi first
#define se second
#define eb emplace_back
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define endl '\n'
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define SZ(x) (int)(x).size()
#define FOR(a, b, c) for (auto a = (b); (a) < (c); ++(a))
#define F0R(a, b) FOR (a, 0, (b))
template <typename T>
bool ckmin(T& a, const T& b) { return a > b ? a = b, true : false; }
template <typename T>
bool ckmax(T& a, const T& b) { return a < b ? a = b, true : false; }
#ifndef DEBUG
#define DEBUG 0
#endif
#define dout if (DEBUG) cerr
#define dvar(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
#line 2 "code/math/totoid.cc"
int phi(int n) {
    int result = n;
    for (int i = 2; i * i <= n; i++) {
        if(n % i == 0) {
            while(n % i == 0) n /= i;
            result -= result / i;
        }
    }
    if(n > 1) result -= result / n;
    return result;
}
#line 4 "tests/aoj/totoid.eulers_phi_function.test.cpp"

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);

  ll n;
  cin >> n;
  cout << phi(n) << endl;
}