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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#140969#6740. Functioncciafrino#TL 374ms4400kbC++202.7kb2023-08-17 02:12:442023-08-17 02:12:48

Judging History

你现在查看的是最新测评结果

  • [2023-08-17 02:12:48]
  • 评测
  • 测评结果:TL
  • 用时:374ms
  • 内存:4400kb
  • [2023-08-17 02:12:44]
  • 提交

answer

#include<bits/stdc++.h>

namespace std {
int minv(int a, int m) {
	a %= m; assert(a);
	return a == 1 ? 1 : int(m - int64_t(minv(m, a)) * m / a);
}
template<unsigned M_> struct modnum {
	static constexpr unsigned M = M_;
	using ll = int64_t; using ull = uint64_t; unsigned x;
	modnum& norm(unsigned a) { x = a < M ? a : a - M; return *this; }
	constexpr modnum(ll a = 0U) : x(unsigned((a %= ll(M)) < 0 ? a + ll(M) : a)) {}
	explicit operator int() const { return x; }
	modnum& operator+=(const modnum& a) { return norm(x + a.x); }
	modnum& operator-=(const modnum& a) { return norm(x - a.x + M); }
	modnum& operator*=(const modnum& a) { x = unsigned(ull(x) * a.x % M); return *this; }
	modnum& operator/=(const modnum& a) { return (*this *= a.inv()); }
	modnum operator+(const modnum& a) const { return (modnum(*this) += a); }
	modnum operator-(const modnum& a) const { return (modnum(*this) -= a); }
	modnum operator*(const modnum& a) const { return (modnum(*this) *= a); }
	modnum operator/(const modnum& a) const { return (modnum(*this) /= a); }
	template<typename T> friend modnum operator+(T a, const modnum& b) { return (modnum(a) += b); }
	template<typename T> friend modnum operator-(T a, const modnum& b) { return (modnum(a) -= b); }
	template<typename T> friend modnum operator*(T a, const modnum& b) { return (modnum(a) *= b); }
	template<typename T> friend modnum operator/(T a, const modnum& b) { return (modnum(a) /= b); }
	modnum operator+() const { return *this; }
	modnum operator-() const { return modnum() - *this; }
	modnum pow(ll e) const {
		if (e < 0) return inv().pow(-e);
		modnum b = x, xe = 1U;
		for (; e; e >>= 1) { if (e & 1) xe *= b; b *= b; }
		return xe;
	}
	modnum inv() const { return minv(x, M); }
	friend modnum inv(const modnum& a) { return a.inv(); }
	explicit operator bool() const { return x; }
	friend bool operator==(const modnum& a, const modnum& b) { return a.x == b.x; }
	friend bool operator!=(const modnum& a, const modnum& b) { return a.x != b.x; }
	friend ostream &operator<<(ostream& os, const modnum& a) { return os << a.x; }
	friend istream &operator>>(istream& in, modnum& n) { ll v_; in >> v_; n = modnum(v_); return in; }
}; }

int main() {
	using namespace std;
	cin.tie(nullptr)->sync_with_stdio(false);
	int N; cin >> N;

	const int lo = 2, hi = 20210926;

	using num = modnum<998244353U>;

	map<int, num> mapa;
	auto rec = [&](auto&& self, int X) -> num {
		if (mapa.count(X) > 0) return mapa[X];
		num S = 1;
		for (int a = 1, b; a <= X; a = b+1) {
			b = X / (X / a);
			if (max(lo, a) <= min(hi, b)) {
				int mi = max(lo, a), ma = min(hi, b);
				S += num(ma - mi + 1) * self(self, X/a);
			}
		}
		return mapa[X] = S;
	};

	cout << rec(rec, N) << '\n';
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3448kb

input:

1

output:

1

result:

ok 1 number(s): "1"

Test #2:

score: 0
Accepted
time: 1ms
memory: 3512kb

input:

2

output:

2

result:

ok 1 number(s): "2"

Test #3:

score: 0
Accepted
time: 1ms
memory: 3468kb

input:

100

output:

949

result:

ok 1 number(s): "949"

Test #4:

score: 0
Accepted
time: 1ms
memory: 3576kb

input:

10

output:

19

result:

ok 1 number(s): "19"

Test #5:

score: 0
Accepted
time: 1ms
memory: 3492kb

input:

1000

output:

48614

result:

ok 1 number(s): "48614"

Test #6:

score: 0
Accepted
time: 1ms
memory: 3504kb

input:

10000

output:

2602393

result:

ok 1 number(s): "2602393"

Test #7:

score: 0
Accepted
time: 2ms
memory: 3540kb

input:

100000

output:

139804054

result:

ok 1 number(s): "139804054"

Test #8:

score: 0
Accepted
time: 6ms
memory: 3660kb

input:

1000000

output:

521718285

result:

ok 1 number(s): "521718285"

Test #9:

score: 0
Accepted
time: 58ms
memory: 3784kb

input:

10000000

output:

503104917

result:

ok 1 number(s): "503104917"

Test #10:

score: 0
Accepted
time: 374ms
memory: 4400kb

input:

100000000

output:

198815604

result:

ok 1 number(s): "198815604"

Test #11:

score: -100
Time Limit Exceeded

input:

1000000000

output:


result: