結果
| 問題 |
No.181 A↑↑N mod M
|
| コンテスト | |
| ユーザー |
kei
|
| 提出日時 | 2018-09-13 01:45:51 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
RE
|
| 実行時間 | - |
| コード長 | 2,406 bytes |
| コンパイル時間 | 1,828 ms |
| コンパイル使用メモリ | 169,692 KB |
| 実行使用メモリ | 817,920 KB |
| 最終ジャッジ日時 | 2024-06-28 11:44:41 |
| 合計ジャッジ時間 | 5,551 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 RE * 2 MLE * 1 |
| other | -- * 37 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
/*
<url:https://yukicoder.me/problems/no/181>
問題文============================================================
=================================================================
解説=============================================================
================================================================
*/
ll powmod(ll a,ll b,ll m) {ll res=1;a%=m;for(;b;b>>=1){if(b&1)res=res*a%m;a=a*a%m;}return res;}
ll Euler_Phi(ll m) {
ll res = m;
for (ll i = 2; i * i <= m; i++) { if (m % i == 0) { res = res / i * (i - 1); while(m % i == 0) m/=i;}}
if (m != 0) res = res / m * (m - 1);
return res;
}
ll MAXM;
vector<ll> Phi;
void initPhi(){
Phi.resize(MAXM);
for(int i = 0; i < MAXM;i++) Phi[i] = Euler_Phi(i);
}
ll greedy_test(ll a,ll n){
if(a == 1) return 1;
ll ret = 1;
for(int i = 0; i < n;i++){
ll t = ret; ret = 1;
for(int j = 0; j < t;j++){
ret *= a;
if(ret>MAXM) return MAXM;
}
}
return ret;
}
// a↑↑b mod m
ll tetration(ll a,ll n,ll m){
if(m == 1) return 0;
if(n == 0) return 1;
ll t = greedy_test(a, n);
if(t < MAXM) return t%m;
return powmod(a,MAXM+(tetration(a, n-1,Phi[m])-MAXM)%Phi[m],m);
}
ll solve(){
ll res = 0;
ll A,N,M; cin >> A >> N >> M;
MAXM = M+1; initPhi();
res = tetration(A, N, M);
return res;
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
kei