結果
問題 | No.1255 ハイレーツ・オブ・ボリビアン |
ユーザー |
![]() |
提出日時 | 2020-10-09 21:53:16 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 33 ms / 2,000 ms |
コード長 | 1,147 bytes |
コンパイル時間 | 2,017 ms |
コンパイル使用メモリ | 199,224 KB |
最終ジャッジ日時 | 2025-01-15 04:31:46 |
ジャッジサーバーID (参考情報) |
judge3 / judge3 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 1 |
other | AC * 15 |
コンパイルメッセージ
In file included from /usr/include/c++/13/istream:41, from /usr/include/c++/13/sstream:40, from /usr/include/c++/13/complex:45, from /usr/include/c++/13/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:127, from main.cpp:1: In member function ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>]’, inlined from ‘int main()’ at main.cpp:64:15: /usr/include/c++/13/ostream:204:25: warning: ‘ans’ may be used uninitialized [-Wmaybe-uninitialized] 204 | { return _M_insert(__n); } | ~~~~~~~~~^~~~~ main.cpp: In function ‘int main()’: main.cpp:57:17: note: ‘ans’ was declared here 57 | long long ans; | ^~~
ソースコード
#include <bits/stdc++.h> using namespace std; long long MOD; long long modpow(long long a, long long b){ long long ans = 1; while (b > 0){ if (b % 2 == 1){ ans *= a; ans %= MOD; } a *= a; a %= MOD; b /= 2; } return ans; } int euler_phi(int N){ vector<int> pf; int ans = N; for (int j = 2; j * j <= N; j++){ if (N % j == 0){ ans /= j; ans *= j - 1; while (N % j == 0){ N /= j; } } } if (N != 1){ ans /= N; ans *= N - 1; } return ans; } int main(){ int T; cin >> T; for (int i = 0; i < T; i++){ int N; cin >> N; if (N == 1){ cout << 1 << endl; } else { int M = N * 2 - 1; MOD = M; int F = euler_phi(M); vector<int> fact; for (int j = 1; j * j <= F; j++){ if (F % j == 0){ fact.push_back(j); if (j * j < F){ fact.push_back(F / j); } } } sort(fact.begin(), fact.end()); long long ans; for (int x : fact){ if (modpow(2, x) == 1){ ans = x; break; } } cout << ans << endl; } } }