結果

問題 No.856 増える演算
ユーザー QCFiumQCFium
提出日時 2019-10-08 19:01:41
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 226 ms / 3,153 ms
コード長 3,127 bytes
コンパイル時間 2,394 ms
コンパイル使用メモリ 183,016 KB
実行使用メモリ 12,968 KB
最終ジャッジ日時 2024-11-07 10:58:49
合計ジャッジ時間 16,370 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)

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 AC 114 ms
10,848 KB
testcase_01 AC 114 ms
10,864 KB
testcase_02 AC 114 ms
10,728 KB
testcase_03 AC 113 ms
10,856 KB
testcase_04 AC 114 ms
10,728 KB
testcase_05 AC 114 ms
10,856 KB
testcase_06 AC 115 ms
10,732 KB
testcase_07 AC 114 ms
10,732 KB
testcase_08 AC 114 ms
10,728 KB
testcase_09 AC 113 ms
10,724 KB
testcase_10 AC 116 ms
10,728 KB
testcase_11 AC 114 ms
10,724 KB
testcase_12 AC 113 ms
10,724 KB
testcase_13 AC 115 ms
10,736 KB
testcase_14 AC 114 ms
10,636 KB
testcase_15 AC 114 ms
10,728 KB
testcase_16 AC 116 ms
10,852 KB
testcase_17 AC 114 ms
10,860 KB
testcase_18 AC 114 ms
10,728 KB
testcase_19 AC 112 ms
10,728 KB
testcase_20 AC 114 ms
10,852 KB
testcase_21 AC 114 ms
10,728 KB
testcase_22 AC 113 ms
10,856 KB
testcase_23 AC 117 ms
11,124 KB
testcase_24 AC 117 ms
10,872 KB
testcase_25 AC 115 ms
10,840 KB
testcase_26 AC 115 ms
10,868 KB
testcase_27 AC 114 ms
10,732 KB
testcase_28 AC 117 ms
11,092 KB
testcase_29 AC 117 ms
11,036 KB
testcase_30 AC 116 ms
10,864 KB
testcase_31 AC 114 ms
10,868 KB
testcase_32 AC 117 ms
11,028 KB
testcase_33 AC 121 ms
11,112 KB
testcase_34 AC 133 ms
11,232 KB
testcase_35 AC 129 ms
10,964 KB
testcase_36 AC 131 ms
11,232 KB
testcase_37 AC 130 ms
11,268 KB
testcase_38 AC 116 ms
10,848 KB
testcase_39 AC 117 ms
11,000 KB
testcase_40 AC 119 ms
11,028 KB
testcase_41 AC 120 ms
10,980 KB
testcase_42 AC 136 ms
11,380 KB
testcase_43 AC 119 ms
10,932 KB
testcase_44 AC 114 ms
10,736 KB
testcase_45 AC 117 ms
11,100 KB
testcase_46 AC 121 ms
10,992 KB
testcase_47 AC 120 ms
10,984 KB
testcase_48 AC 127 ms
11,124 KB
testcase_49 AC 123 ms
11,076 KB
testcase_50 AC 127 ms
11,144 KB
testcase_51 AC 133 ms
11,152 KB
testcase_52 AC 135 ms
11,420 KB
testcase_53 AC 171 ms
11,548 KB
testcase_54 AC 141 ms
11,244 KB
testcase_55 AC 167 ms
11,708 KB
testcase_56 AC 139 ms
11,008 KB
testcase_57 AC 175 ms
11,648 KB
testcase_58 AC 158 ms
11,452 KB
testcase_59 AC 200 ms
12,680 KB
testcase_60 AC 149 ms
11,236 KB
testcase_61 AC 200 ms
11,760 KB
testcase_62 AC 190 ms
12,160 KB
testcase_63 AC 119 ms
10,816 KB
testcase_64 AC 182 ms
11,892 KB
testcase_65 AC 135 ms
11,148 KB
testcase_66 AC 149 ms
11,340 KB
testcase_67 AC 164 ms
11,308 KB
testcase_68 AC 191 ms
12,220 KB
testcase_69 AC 187 ms
11,928 KB
testcase_70 AC 214 ms
12,256 KB
testcase_71 AC 192 ms
12,264 KB
testcase_72 AC 177 ms
11,808 KB
testcase_73 AC 219 ms
12,840 KB
testcase_74 AC 219 ms
12,968 KB
testcase_75 AC 221 ms
12,968 KB
testcase_76 AC 221 ms
12,840 KB
testcase_77 AC 219 ms
12,844 KB
testcase_78 AC 221 ms
12,964 KB
testcase_79 AC 221 ms
12,844 KB
testcase_80 AC 226 ms
12,920 KB
testcase_81 AC 223 ms
12,840 KB
testcase_82 AC 172 ms
12,844 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int pow(int a, int b, int mod) {
	int res = 1;
	for (; b; b >>= 1) {
		if (b & 1) res = (int64_t) res * a % mod;
		a = (int64_t) a * a % mod;
	}
	return res;
}
int inv(int i, int mod) { return pow(i, mod - 2, mod); }

template<int mod, int proot> struct NTT {
	int get_mod() { return mod; }
	void ntt(std::vector<int> &a, bool inverse) {
		int n = a.size();
		assert((n & -n) == n);
		int h = pow(proot, (mod - 1) / n, mod);
		if (inverse) h = inv(h, mod);
		
		for (int i = 0, j = 1; j < n - 1; j++) {
			for (int k = n >> 1; k > (i ^= k); k >>= 1);
			if (j < i) std::swap(a[i], a[j]);
		}
		for (int i = 1; i < n; i <<= 1) {
			int base = pow(h, n / i / 2, mod);
			int w = 1;
			for (int j = 0; j < i; j++) {
				for (int k = j; k < n; k += i << 1) {
					int u = a[k];
					int d = (int64_t) a[k + i] * w % mod;
					a[k] = u + d;
					if (a[k] >= mod) a[k] -= mod;
					a[k + i] = u - d;
					if (a[k + i] < 0) a[k + i] += mod;
				}
				w = (int64_t) w * base % mod;
			}
		}
		if (inverse) {
			int ninv = inv(a.size(), mod);
			for (auto &i : a) i = (int64_t) i * ninv % mod;
		}
	}
	std::vector<int> conv(const std::vector<int> a_, const std::vector<int> b_) {
		std::vector<int> a = a_, b = b_;
		size_t size = 1;
		for (; size < a_.size() + b_.size(); size <<= 1);
		a.resize(size);
		b.resize(size);
		ntt(a, false);
		ntt(b, false);
		for (size_t i = 0; i < size; i++) a[i] = (int64_t) a[i] * b[i] % mod;
		ntt(a, true);
		a.resize(a_.size() + b_.size() - 1);
		return a;
	}
};
#define MOD 1000000007

std::vector<int64_t> conv(const std::vector<int> a, const std::vector<int> b) {
	NTT<998244353, 3> ntt1;
	NTT<469762049, 3> ntt2;
	auto r0 = ntt1.conv(a, b);
	auto r1 = ntt2.conv(a, b);
	int n = r0.size();
	std::vector<int64_t> res;
	for (int i = 0; i < n; i++) {
		int64_t cur = r0[i];
		while (cur % 469762049 != r1[i]) cur += 998244353;
		res.push_back(cur);
	}
	return res;
}
int main() {
	int n = ri();
	int a[n];
	for (int i = 0; i < n; i++) a[i] = ri();
	
	std::multiset<std::pair<int, int> > all;
	for (int i = 0; i < n; i++) all.insert({a[i], i});
	std::pair<int, int> optimal;
	double min = 1000000000;
	for (int i = 0; i + 1 < n; i++) {
		all.erase(all.find({a[i], i}));
		double cur = log2(a[i]) * all.begin()->first + log2(a[i] + all.begin()->first);
		if (min > cur) min = cur, optimal = {i, all.begin()->second};
	}
	
	int64_t sum[n];
	sum[n - 1] = 0;
	for (int i = n - 2; i >= 0; i--) sum[i] = sum[i + 1] + a[i + 1];
	int res = 1;
	for (int i = 0; i < n; i++) res = (int64_t) res * pow(a[i], sum[i] % (MOD - 1), MOD) % MOD;
	
	std::vector<int> num(100001);
	for (int i = 0; i < n; i++) num[a[i]]++;
	auto conved = conv(num, num);
	for (int i = 0; i < n; i++) conved[a[i] + a[i]]--;
	for (int i = 1; i <= 200000; i++) assert(conved[i] % 2 == 0), conved[i] >>= 1, res = (int64_t) res * pow(i, conved[i] % (MOD - 1), MOD) % MOD;
	res = (int64_t) res * inv((int64_t) (a[optimal.first] + a[optimal.second]) * pow(a[optimal.first], a[optimal.second], MOD) % MOD, MOD) % MOD;
	
	std::cout << res << std::endl;
	
	return 0;
}
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