test/aoj/NTL/NTL_1_D.test.cpp

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Last update: 2023-11-11 17:58:53+09:00
Problem: https://onlinejudge.u-aizu.ac.jp/problems/NTL_1_D

Depends on

Code

#define PROBLEM "https://onlinejudge.u-aizu.ac.jp/problems/NTL_1_D"

#include "../../../template/template.hpp"

#include "../../../math/euler.hpp"

int main(){
  int n;
  cin >> n;
  cout << euler(n) << "\n";
}

#line 1 "test/aoj/NTL/NTL_1_D.test.cpp"
#define PROBLEM "https://onlinejudge.u-aizu.ac.jp/problems/NTL_1_D"

#line 1 "template/template.hpp"
#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
#include <tuple>
#include <cstdint>
#include <cstdio>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <bitset>
#include <cctype>
#include <climits>
#include <functional>
#include <cassert>
#include <numeric>
#include <cstring>
#define rep(i, n) for(int i = 0; i < (n); i++)
#define per(i, n) for(int i = (n) - 1; i >= 0; i--)
using ll = long long;
#define vi vector<int>
#define vvi vector<vi>
#define vl vector<ll>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
constexpr int mod = 1000000007;
using namespace std;
template<class T, class U>
bool chmax(T &a, const U &b){ return a < b ? (a = b, 1) : 0; }
template<class T, class U>
bool chmin(T &a, const U &b){ return a > b ? (a = b, 1) : 0; }
#line 4 "test/aoj/NTL/NTL_1_D.test.cpp"

#line 1 "math/euler.hpp"
ll euler(ll n){
  ll res = n, k = n;
  for(ll i = 2; i*i <= k; i++){
    if(n % i) continue;
    res = res / i * (i - 1);
    while(n % i == 0) n /= i;
  }
  if(n != 1) res = res / n * (n - 1);
  return res;
}
#line 6 "test/aoj/NTL/NTL_1_D.test.cpp"

int main(){
  int n;
  cin >> n;
  cout << euler(n) << "\n";
}