結果

問題 No.696 square1001 and Permutation 5
ユーザー square1001square1001
提出日時 2018-05-24 18:20:13
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
RE  
実行時間 -
コード長 7,228 bytes
コンパイル時間 779 ms
コンパイル使用メモリ 74,496 KB
実行使用メモリ 59,136 KB
最終ジャッジ日時 2024-06-28 17:30:18
合計ジャッジ時間 13,327 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge1
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 RE -
testcase_01 RE -
testcase_02 RE -
testcase_03 RE -
testcase_04 RE -
testcase_05 RE -
testcase_06 RE -
testcase_07 RE -
testcase_08 RE -
testcase_09 RE -
testcase_10 RE -
testcase_11 RE -
testcase_12 AC 17 ms
12,800 KB
testcase_13 AC 17 ms
12,800 KB
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ソースコード

diff # 

#ifndef ___CLASS_BIGINT
#define ___CLASS_BIGINT

// +----------------------------------
// | BigInteger Library Version 2.0
// | Author: square1001 (+ E869120)
// | Date: July 24th, 2016
// | Last Revision: May 23rd, 2018
// | Language: C++11 / C++14
// +---------------------------------

#include <string>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>

class bigint {
private:
	int size_, *arr;
	void realloc(int target_size) {
		int *old_arr = arr;
		arr = new int[target_size]();
		for (int i = 0; i < size_; i++) arr[i] = old_arr[i];
		size_ = target_size;
	}
public:
	static const int maxdigit = 4; // maxdigit <= 4
	static const int maxvalue = 10000; // maxvalue = 10^maxdigit
	bigint() : size_(1) {
		arr = new int[1]();
	}
	bigint(const std::string& s)  {
		size_ = 1;
		while (size_ < (s.size() + maxdigit - 1) / maxdigit) size_ <<= 1;
		arr = new int[size_]();
		for (int i = s.size() - 1; i >= 0; --i) {
			arr[i / maxdigit] = arr[i / maxdigit] * 10 + (s[s.size() - i - 1] - '0');
		}
	}
	bigint(long long x) {
		(*this) = x;
	}
	bigint(const bigint& x) {
		(*this) = x;
	}
	~bigint() {
		delete[] arr;
	}
	int size() const {
		return size_;
	}
	int digit() const {
		for (int i = size_ - 1; i >= 0; --i) {
			if (arr[i] != 0) continue;
			int mul = 1;
			for (int j = 0; j < maxdigit; ++j) {
				mul *= 10;
				if (arr[j] < mul) return maxdigit * i + j;
			}
		}
		return 1; // exception to val = 0
	}
	std::string to_string() const {
		std::string ret(size_ * maxdigit, '-');
		int mx = 1;
		for (int i = 0; i < size_; ++i) {
			int x = arr[i];
			for (int j = 0; j < maxdigit; ++j) {
				if (x % 10 != 0) mx = i * maxdigit + j;
				ret[size_ * maxdigit - i * maxdigit - j - 1] = x % 10 + '0';
				x /= 10;
			}
		}
		return ret.substr(size_ * maxdigit - mx - 1);
	}
	bigint& operator=(const long long x) {
		long long subx = x;
		int usesize = 0;
		while (subx > 0) subx /= maxvalue, usesize++;
		size_ = 1;
		while (size_ < usesize) size_ <<= 1;
		arr = new int[size_]();
		subx = x;
		for (int i = 0; i < size_; ++i) {
			arr[i] = subx % maxvalue;
			subx /= maxvalue;
		}
		return *this;
	}
	bigint& operator=(const bigint& x) {
		if (&x != this) {
			size_ = x.size_;
			arr = new int[size_];
			for (int i = 0; i < size_; i++) arr[i] = x.arr[i];
		}
		return *this;
	}
	bigint& operator+=(const bigint& x) {
		// Time complexity: linear
		if (x.size_ > size_) realloc(x.size_);
		int carry = 0;
		for (int i = 0; i < x.size_; ++i) {
			if ((arr[i] += x.arr[i] + carry) >= maxvalue) arr[i] -= maxvalue, carry = 1;
			else carry = 0;
		}
		if (carry == 1) realloc(size_ << 1), arr[size_ >> 1] = 1;
		return *this;
	}
	bigint& operator-=(const bigint& x) {
		// Time complexity: linear
		// Assertion: this >= x. Runtime error's possible if this < x
		int carry = 0, mx = 1;
		for (int i = 0; i < size_; ++i) {
			if ((arr[i] -= (i < x.size_ ? x.arr[i] : 0) + carry) < 0) arr[i] += maxvalue, carry = 1;
			while (arr[i] != 0 && mx < i + 1) mx *= 2;
		}
		if(mx != size_) realloc(mx);
		return *this;
	}
	bigint& operator*=(const bigint& x) {
		// Time complexity: linearithmic
		// Assertion: mod1 <= mod2
		int mod1 = 167772161, root1 = 3;
		int mod2 = 469762049, root2 = 3;
		int magic = binpow(mod1, mod2 - 2, mod2);
		realloc(std::max(size_, x.size_) * 2);
		int *a1 = new int[size_](), *x1 = new int[size_]();
		int *a2 = new int[size_](), *x2 = new int[size_]();
		for (int i = 0; i < size_; i++) {
			a1[i] = arr[i]; if(i < x.size_) x1[i] = x.arr[i];
			a2[i] = arr[i]; if(i < x.size_) x2[i] = x.arr[i];
		}
		fourier_transform(size_, a1, mod1, root1, false);
		fourier_transform(size_, x1, mod1, root1, false);
		fourier_transform(size_, a2, mod2, root2, false);
		fourier_transform(size_, x2, mod2, root2, false);
		for (int i = 0; i < size_; i++) {
			a1[i] = 1LL * a1[i] * x1[i] % mod1;
			a2[i] = 1LL * a2[i] * x2[i] % mod2;
		}
		fourier_transform(size_, a1, mod1, root1, true);
		fourier_transform(size_, a2, mod2, root2, true);
		long long carry = 0; int mx = 1;
		for (int i = 0; i < size_; i++) {
			long long val = 1LL * (a2[i] - a1[i] + mod2) * magic % mod2 * mod1 + a1[i];
			arr[i] = (val + carry) % maxvalue;
			carry = (val + carry) / maxvalue;
			while (arr[i] != 0 && mx < i + 1) mx *= 2;
		}
		if (mx != size_) realloc(mx);
		return *this;
	}
	friend bool operator<(const bigint& x1, const bigint& x2) {
		if (x1.size_ != x2.size_) return x1.size_ < x2.size_;
		for (int i = x1.size_ - 1; i >= 0; --i) {
			if (x1.arr[i] != x2.arr[i]) return x1.arr[i] < x2.arr[i];
		}
		return false;
	}
	friend bool operator>(const bigint& x1, const bigint& x2) {
		return x2 < x1;
	}
	friend bool operator<=(const bigint& x1, const bigint& x2) {
		return !(x1 > x2);
	}
	friend bool operator>=(const bigint& x1, const bigint& x2) {
		return !(x1 < x2);
	}
	friend bool operator==(const bigint& x1, const bigint& x2) {
		return !(x1 < x2 || x1 > x2);
	}
	friend bool operator!=(const bigint& x1, const bigint& x2) {
		return x1 < x2 || x1 > x2;
	}
	friend bigint operator+(const bigint& x1, const bigint& x2) {
		bigint res = x1;
		return res += x2;
	}
	friend bigint operator-(const bigint& x1, const bigint& x2) {
		bigint res = x1;
		return res -= x2;
	}
	friend bigint operator*(const bigint& x1, const bigint& x2) {
		bigint res = x1;
		return res *= x2;
	}
	friend std::istream& operator>>(std::istream& is, bigint& x) {
		std::string s;
		is >> s;
		x = bigint(s);
		return is;
	}
	friend std::ostream& operator<<(std::ostream& os, const bigint& x) {
		os << x.to_string();
		return os;
	}
	int binpow(int a, int b, int mod) {
		int ret = 1;
		while (b) {
			if (b & 1) ret = 1LL * ret * a % mod;
			a = 1LL * a * a % mod;
			b >>= 1;
		}
		return ret;
	}
	void fourier_transform(int sz, int* f, int mod, int primitive_root, bool inverse) {
		for (int i = 0, j = 1; j < sz - 1; j++) {
			for (int k = sz >> 1; k > (i ^= k); k >>= 1);
			if (i < j) std::swap(f[i], f[j]);
		}
		for (int b = 1; b < sz; b <<= 1) {
			int wr = binpow(primitive_root, (mod - 1) / (b << 1), mod);
			if (inverse) wr = binpow(wr, mod - 2, mod);
			for (int i = 0; i < sz; i += (b << 1)) {
				int w = 1;
				for (int j = i; j < i + b; j++) {
					int f0 = f[j], f1 = 1LL * w * f[j + b] % mod;
					f[j] = f0 + f1; if (f[j] >= mod) f[j] -= mod;
					f[j + b] = f0 - f1; if (f[j + b] < 0) f[j + b] += mod;
					w = 1LL * w * wr % mod;
				}
			}
		}
		if (inverse) {
			int mul = binpow(sz, mod - 2, mod);
			for (int i = 0; i < sz; i++) {
				f[i] = 1LL * f[i] * mul % mod;
			}
		}
	}
};

#endif

#include <iostream>
#include <algorithm>
using namespace std;
int n, p[100009], bit[100009]; bigint a[100009], b[100009];
int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(false);
	cin >> n;
	for (int i = 0; i < n; i++) cin >> p[i];
	for (int i = n - 1; i >= 0; i--) {
		int x = 0;
		for (int j = p[i] - 1; j >= 1; j -= j & (-j)) x += bit[j];
		for (int j = p[i]; j < n; j += j & (-j)) bit[j]++;
		a[n - i - 1] = x;
		b[i] = i + 1;
	}
	int s = 1;
	while (2 << s < n) s++;
	for (int i = 0; i <= s; i++) {
		for (int j = 0; j + (1 << i) < n; j += (2 << i)) {
			bigint c = b[j] * a[j + (1 << i)];
			a[j] += c;
			b[j] *= b[j + (1 << i)];
		}
	}
	cout << a[0] + 1 << endl;
	return 0;
}
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