結果
問題 | No.3133 法B逆元 |
ユーザー |
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提出日時 | 2025-05-02 21:39:25 |
言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 11 ms / 2,000 ms |
コード長 | 10,389 bytes |
コンパイル時間 | 3,414 ms |
コンパイル使用メモリ | 278,636 KB |
実行使用メモリ | 6,272 KB |
最終ジャッジ日時 | 2025-05-02 21:39:30 |
合計ジャッジ時間 | 4,346 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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ファイルパターン | 結果 |
---|---|
other | AC * 21 |
ソースコード
#include <bits/stdc++.h> #include <cassert> using namespace std; using ll = long long int; using u64 = unsigned long long; using pll = pair<ll, ll>; // #include <atcoder/all> // using namespace atcoder; #define REP(i, a, b) for (ll i = (a); i < (b); i++) #define REPrev(i, a, b) for (ll i = (a); i >= (b); i--) #define ALL(coll) (coll).begin(), (coll).end() #define SIZE(v) ((ll)((v).size())) #define REPOUT(i, a, b, exp, sep) REP(i, (a), (b)) cout << (exp) << (i + 1 == (b) ? "" : (sep)); cout << "\n" // @@ !! LIM(debug) // ---- inserted function f:<< from util.cc // declarations template <typename T1, typename T2> ostream& operator<< (ostream& os, const pair<T1,T2>& p); template <typename T1, typename T2, typename T3> ostream& operator<< (ostream& os, const tuple<T1,T2,T3>& t); template <typename T1, typename T2, typename T3, typename T4> ostream& operator<< (ostream& os, const tuple<T1,T2,T3,T4>& t); template <typename T1, typename T2, typename T3, typename T4, typename T5> ostream& operator<< (ostream& os, const tuple<T1,T2,T3,T4,T5>& t); template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6> ostream& operator<< (ostream& os, const tuple<T1,T2,T3,T4,T5,T6>& t); template <typename T> ostream& operator<< (ostream& os, const vector<T>& v); template <typename T, typename C> ostream& operator<< (ostream& os, const set<T, C>& v); template <typename T, typename C> ostream& operator<< (ostream& os, const unordered_set<T, C>& v); template <typename T, typename C> ostream& operator<< (ostream& os, const multiset<T, C>& v); template <typename T1, typename T2, typename C> ostream& operator<< (ostream& os, const map<T1, T2, C>& mp); template <typename T1, typename T2, typename C> ostream& operator<< (ostream& os, const unordered_map<T1, T2, C>& mp); template <typename T, typename T2> ostream& operator<< (ostream& os, const queue<T, T2>& orig); template <typename T, typename T2> ostream& operator<< (ostream& os, const deque<T, T2>& orig); template <typename T, typename T2, typename T3> ostream& operator<< (ostream& os, const priority_queue<T, T2, T3>& orig); template <typename T> ostream& operator<< (ostream& os, const stack<T>& st); #if __cplusplus >= 201703L template <typename T> ostream& operator<< (ostream& os, const optional<T>& t); #endif ostream& operator<< (ostream& os, int8_t x); ostream& operator<< (ostream& os, const __int128& x); // definitions template <typename T1, typename T2> ostream& operator<< (ostream& os, const pair<T1,T2>& p) { os << "(" << p.first << ", " << p.second << ")"; return os; } template <typename T1, typename T2, typename T3> ostream& operator<< (ostream& os, const tuple<T1,T2,T3>& t) { os << "(" << get<0>(t) << ", " << get<1>(t) << ", " << get<2>(t) << ")"; return os; } template <typename T1, typename T2, typename T3, typename T4> ostream& operator<< (ostream& os, const tuple<T1,T2,T3,T4>& t) { os << "(" << get<0>(t) << ", " << get<1>(t) << ", " << get<2>(t) << ", " << get<3>(t) << ")"; return os; } template <typename T1, typename T2, typename T3, typename T4, typename T5> ostream& operator<< (ostream& os, const tuple<T1,T2,T3,T4,T5>& t) { os << "(" << get<0>(t) << ", " << get<1>(t) << ", " << get<2>(t) << ", " << get<3>(t) << ", " << get<4>(t) << ")"; return os; } template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6> ostream& operator<< (ostream& os, const tuple<T1,T2,T3,T4,T5,T6>& t) { os << "(" << get<0>(t) << ", " << get<1>(t) << ", " << get<2>(t) << ", " << get<3>(t) << ", " << get<4>(t) << ", " << get<5>(t) << ")"; return os; } template <typename T> ostream& operator<< (ostream& os, const vector<T>& v) { os << '['; for (auto it = v.begin(); it != v.end(); it++) { if (it != v.begin()) os << ", "; os << *it; } os << ']'; return os; } template <typename T, typename C> ostream& operator<< (ostream& os, const set<T, C>& v) { os << '{'; for (auto it = v.begin(); it != v.end(); it++) { if (it != v.begin()) os << ", "; os << *it; } os << '}'; return os; } template <typename T, typename C> ostream& operator<< (ostream& os, const unordered_set<T, C>& v) { os << '{'; for (auto it = v.begin(); it != v.end(); it++) { if (it != v.begin()) os << ", "; os << *it; } os << '}'; return os; } template <typename T, typename C> ostream& operator<< (ostream& os, const multiset<T, C>& v) { os << '{'; for (auto it = v.begin(); it != v.end(); it++) { if (it != v.begin()) os << ", "; os << *it; } os << '}'; return os; } template <typename T1, typename T2, typename C> ostream& operator<< (ostream& os, const map<T1, T2, C>& mp) { os << '['; for (auto it = mp.begin(); it != mp.end(); it++) { if (it != mp.begin()) os << ", "; os << it->first << ": " << it->second; } os << ']'; return os; } template <typename T1, typename T2, typename C> ostream& operator<< (ostream& os, const unordered_map<T1, T2, C>& mp) { os << '['; for (auto it = mp.begin(); it != mp.end(); it++) { if (it != mp.begin()) os << ", "; os << it->first << ": " << it->second; } os << ']'; return os; } template <typename T, typename T2> ostream& operator<< (ostream& os, const queue<T, T2>& orig) { queue<T, T2> que(orig); bool first = true; os << '['; while (!que.empty()) { T x = que.front(); que.pop(); if (!first) os << ", "; os << x; first = false; } return os << ']'; } template <typename T, typename T2> ostream& operator<< (ostream& os, const deque<T, T2>& orig) { deque<T, T2> que(orig); bool first = true; os << '['; while (!que.empty()) { T x = que.front(); que.pop_front(); if (!first) os << ", "; os << x; first = false; } return os << ']'; } template <typename T, typename T2, typename T3> ostream& operator<< (ostream& os, const priority_queue<T, T2, T3>& orig) { priority_queue<T, T2, T3> pq(orig); bool first = true; os << '['; while (!pq.empty()) { T x = pq.top(); pq.pop(); if (!first) os << ", "; os << x; first = false; } return os << ']'; } template <typename T> ostream& operator<< (ostream& os, const stack<T>& st) { stack<T> tmp(st); os << '['; bool first = true; while (!tmp.empty()) { T& t = tmp.top(); if (first) first = false; else os << ", "; os << t; tmp.pop(); } os << ']'; return os; } #if __cplusplus >= 201703L template <typename T> ostream& operator<< (ostream& os, const optional<T>& t) { if (t.has_value()) os << "v(" << t.value() << ")"; else os << "nullopt"; return os; } #endif ostream& operator<< (ostream& os, int8_t x) { os << (int32_t)x; return os; } // for Enum type; just displays ordinals. template <typename E> typename std::enable_if<std::is_enum<E>::value, std::ostream&>::type operator<<(std::ostream& os, E e) { return os << static_cast<typename std::underlying_type<E>::type>(e); } // This is a very ad-hoc implementation... ostream& operator<<(ostream& os, const __int128& v) { unsigned __int128 a = v < 0 ? -v : v; ll i = 0; string s(64, ' '); if (v == 0) { s[i++] = '0'; }else { while (a > 0) { s[i++] = '0' + (char)(a % 10); a /= 10; } } if (v < 0) { s[i++] = '-'; } s.erase(s.begin() + i, s.end()); reverse(s.begin(), s.end()); os << s; return os; } // ---- end f:<< // ---- inserted library file debug.cc template <class... Args> string dbgFormat(const char* fmt, Args... args) { size_t len = snprintf(nullptr, 0, fmt, args...); char buf[len + 1]; snprintf(buf, len + 1, fmt, args...); return string(buf); } template <class Head> void dbgLog(bool with_nl, Head&& head) { cerr << head; if (with_nl) cerr << endl; } template <class Head, class... Tail> void dbgLog(bool with_nl, Head&& head, Tail&&... tail) { cerr << head << " "; dbgLog(with_nl, forward<Tail>(tail)...); } #if DEBUG #define DLOG(...) dbgLog(true, __VA_ARGS__) #define DLOGNNL(...) dbgLog(false, __VA_ARGS__) #define DFMT(...) cerr << dbgFormat(__VA_ARGS__) << endl #define DCALL(func, ...) func(__VA_ARGS__) #else #define DLOG(...) #define DLOGNNL(...) #define DFMT(...) #define DCALL(func, ...) #endif /* #if DEBUG_LIB #define DLOG_LIB(...) dbgLog(true, __VA_ARGS__) #define DLOGNNL_LIB(...) dbgLog(false, __VA_ARGS__) #define DFMT_LIB(...) cerr << dbgFormat(__VA_ARGS__) << endl #define DCALL_LIB(func, ...) func(__VA_ARGS__) #else #define DLOG_LIB(...) #define DFMT_LIB(...) #define DCALL_LIB(func, ...) #endif */ #define DUP1(E1) #E1 "=", E1 #define DUP2(E1,E2) DUP1(E1), DUP1(E2) #define DUP3(E1,...) DUP1(E1), DUP2(__VA_ARGS__) #define DUP4(E1,...) DUP1(E1), DUP3(__VA_ARGS__) #define DUP5(E1,...) DUP1(E1), DUP4(__VA_ARGS__) #define DUP6(E1,...) DUP1(E1), DUP5(__VA_ARGS__) #define DUP7(E1,...) DUP1(E1), DUP6(__VA_ARGS__) #define DUP8(E1,...) DUP1(E1), DUP7(__VA_ARGS__) #define DUP9(E1,...) DUP1(E1), DUP8(__VA_ARGS__) #define DUP10(E1,...) DUP1(E1), DUP9(__VA_ARGS__) #define DUP11(E1,...) DUP1(E1), DUP10(__VA_ARGS__) #define DUP12(E1,...) DUP1(E1), DUP11(__VA_ARGS__) #define GET_MACRO(_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,NAME,...) NAME #define DUP(...) GET_MACRO(__VA_ARGS__, DUP12, DUP11, DUP10, DUP9, DUP8, DUP7, DUP6, DUP5, DUP4, DUP3, DUP2, DUP1)(__VA_ARGS__) #define DLOGK(...) DLOG(DUP(__VA_ARGS__)) #define DLOGKL(lab, ...) DLOG(lab, DUP(__VA_ARGS__)) #if DEBUG_LIB #define DLOG_LIB DLOG #define DLOGK_LIB DLOGK #define DLOGKL_LIB DLOGKL #endif // ---- end debug.cc // @@ !! LIM -- end mark -- int main(/* int argc, char *argv[] */) { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout << setprecision(20); u64 n; cin >> n; ll b; cin >> b; ll ans; if (b == 1) { ans = 0; }else { if (n == 0) ans = -1; else { ll g = gcd(n, b); if (g == 1) { bool bb = false; REP(i, 1, b) { n = n % b; DLOGK(n, i, n * i % b); if (n * i % b == 1) { ans = i; bb = true; break; } } if (not bb) assert(0); }else { ans = -1; } } } if (ans < 0) { cout << "NaN\n"; }else { cout << ans << "\n"; } return 0; }