結果
問題 | No.1653 Squarefree |
ユーザー |
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提出日時 | 2025-03-25 14:37:19 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
TLE
|
実行時間 | - |
コード長 | 3,252 bytes |
コンパイル時間 | 926 ms |
コンパイル使用メモリ | 69,488 KB |
実行使用メモリ | 82,792 KB |
最終ジャッジ日時 | 2025-03-25 14:38:27 |
合計ジャッジ時間 | 63,692 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 11 TLE * 27 |
コンパイルメッセージ
main.cpp: In function ‘int main()’: main.cpp:113:26: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 113 | long long L, R; scanf("%lld%lld", &L, &R); | ~~~~~^~~~~~~~~~~~~~~~~~~~
ソースコード
#include <vector> #include <cmath> #include <cassert> namespace nachia{ namespace internal{ // mod 2^64 constexpr unsigned long long PowerOfULongLong(unsigned long long a, unsigned long long i){ unsigned long long res = 1; while(i){ if(i&1){ res *= a; } i /= 2; a *= a; } return res; } } unsigned long long FloorOfKthRoot(unsigned long long real, unsigned long long k){ using u64 = unsigned long long; assert(k != 0); if(real <= 1) return real; if(k >= 64) return 1; if(k == 1) return real; struct Precalc{ // a^i <= x static constexpr bool lesseq(u64 a, int i, u64 x) { if (a == 0) return true; for(int j=0; j<i; j++) x /= a; return x >= 1; } unsigned long long BORDER[64]; constexpr Precalc() : BORDER() { for (int idx = 2; idx <= 63; idx++) { u64 l = 0, r = 1ull << 33; while (l + 1 < r) { u64 m = (l + r) / 2; if (lesseq(m, idx, ~0ull)) l = m; else r = m; } BORDER[idx] = r; } }; }; constexpr Precalc precalc; u64 l = 0, r = precalc.BORDER[k]; if(real < r) r = real; while (l + 1 < r) { u64 m = (l + r) / 2; if(internal::PowerOfULongLong(m, k) <= real) l = m; else r = m; } return l; } unsigned long long CeilOfKthRoot(unsigned long long real, unsigned long long k){ if(real <= 1) return real; if(k >= 64) return 2; if(k == 1) return real; unsigned long long x = FloorOfKthRoot(real, k); if(internal::PowerOfULongLong(x, k) != real) x++; return x; } } // namespace nachia namespace nachia{ long long CountSquarefree(long long n){ using i64 = long long; i64 s = 0; auto getMobius = [&](i64 n){ std::vector<bool> sieve(n+1, true); std::vector<signed char> mu(n+1, 1); for(i64 i=2; i<=n; i++) if(sieve[i]){ mu[i] = -1; for(i64 j=i*i; j<=n; j+=i) sieve[j] = false; for(i64 j=i*2; j<=n; j+=i) mu[j] = -mu[j]; for(i64 j=i*i; j<=n; j+=i*i) mu[j] = 0; } return mu; }; if(n <= 4000){ auto mu = getMobius(n+1); for(i64 i=1; i*i<=n; i++) s += n/(i*i) * mu[i]; return s; } i64 I = nachia::FloorOfKthRoot(n, 5); i64 D = nachia::FloorOfKthRoot(n/(I+1), 2); auto mu = getMobius(D+1); std::vector<int> Mf(D+1); for(i64 i=1; i<=D; i++) Mf[i] = Mf[i-1] + mu[i]; std::vector<i64> Md(I+1); for(i64 i=I; i>=1; i--){ i64 m = 1; i64 x = nachia::FloorOfKthRoot(n/i, 2); i64 Dx = nachia::FloorOfKthRoot(x, 2); i64 Rx = x / (Dx+1); i64 r = 2; for( ; i*r*r<=I; r++) m -= Md[i*r*r]; for( ; r<=Rx; r++) m -= Mf[x/r]; for(i64 d=1; d<=Dx; d++) m -= mu[d] * (x/d - Rx); Md[i] = m; s += m; } for(i64 i=1; i<=D; i++) s += mu[i] * (n/(i*i) - I); return s; } } // namespace nachia #include <cstdio> int main(){ long long L, R; scanf("%lld%lld", &L, &R); long long ans = nachia::CountSquarefree(R) - nachia::CountSquarefree(L-1); printf("%lld\n", ans); return 0; }