結果

問題 No.878 Range High-Element Query
コンテスト
ユーザー MarcusAureliusAntoninus
提出日時 2019-09-06 23:19:07
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 91 ms / 2,000 ms
コード長 3,648 bytes
コンパイル時間 2,546 ms
コンパイル使用メモリ 205,796 KB
最終ジャッジ日時 2025-01-07 16:58:30
ジャッジサーバーID
（参考情報） 		judge5 / judge1
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ファイルパターン 結果
sample AC * 1
other AC * 18
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:100:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  100 |         scanf("%d%d", &N, &Q);
      |         ~~~~~^~~~~~~~~~~~~~~~
main.cpp:102:31: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  102 |         for (auto& e: a) scanf("%d", &e);
      |                          ~~~~~^~~~~~~~~~
main.cpp:121:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  121 |                 scanf("%d%d%d", &com, &left, &right);
      |                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

ソースコード

diff # 

#include <bits/stdc++.h>

/////////////////////////
// Range Maximum Query //
/////////////////////////

class RMaxQ {
private:
	std::vector<int64_t> container_;
	const int64_t negative_inf_{-1};

	void build(const unsigned int array_size)
	{
		unsigned int length{1};
		while (length < array_size)
			length <<= 1;
		container_.resize(2 * length, negative_inf_);
	}

public:
	RMaxQ(const unsigned int array_size) { build(array_size); }
	RMaxQ(const std::vector<int64_t> &array)
	{
		build(array.size());
		std::copy(array.begin(), array.end(), container_.begin() + (container_.size() >> 1));
		for (auto i{(container_.size() >> 1) - 1}; i > 0; i--)
			container_[i] = std::max(container_[2 * i], container_[2 * i + 1]);
	}
	// indexは0-indexed
	void update(const int index, const int64_t assigned)
	{
		auto update_place{(container_.size() >> 1) + index};
		container_[update_place] = assigned;
		while (update_place > 1)
		{
			update_place >>= 1;
			container_[update_place] = std::max(container_[2 * update_place], container_[2 * update_place + 1]);
		}
	}
	// left,rightは0-indexed、[left, right)の半開区間
	int64_t get(const int left, const int right) const
	{
		int64_t max{negative_inf_};
		for (int left_i{std::max(0, left) + ((int)container_.size() >> 1)}, right_i{std::min((int)container_.size() >> 1, right) + ((int)container_.size() >> 1)};
			left_i < right_i; left_i >>= 1, right_i >>= 1
			)
		{
			if (left_i & 1)
			{
				max = std::max(max, container_[left_i]);
				left_i++;
			}
			if (right_i & 1)
			{
				right_i--;
				max = std::max(max, container_[right_i]);
			}
		}
		return max;
	}
};

///////////////////////////
// Range Sum Query (BIT) //
///////////////////////////

class RSumQBIT {
private:
	std::vector<int64_t> container_;

	int64_t getHelper(const int index) const
	{
		if (index < 0) return 0;
		if ((int)(container_.size()) <= index) return container_.back();
		int64_t sum{};
		for (int add_place{index}; add_place > 0; add_place -= add_place & -add_place)
			sum += container_[add_place];
		return sum;
	}

public:
	RSumQBIT(const int array_size)
		: container_(array_size + 1) {}
	// indexは0-indexed
	void update(const int index, const int64_t added)
	{
		for (int update_place{index + 1}; update_place < (int)(container_.size()); update_place += update_place & -update_place)
			container_[update_place] += added;
	}
	// left,rightは0-indexed、[left, right)の半開区間
	int64_t get(const int left, const int right) const
	{
		return -getHelper(left) + getHelper(right);
	}
};

int main()
{
	int N, Q;
	scanf("%d%d", &N, &Q);
	std::vector<int> a(N);
	for (auto& e: a) scanf("%d", &e);
	std::vector<int> prev(N, -1);
	RMaxQ myHome(N);
	for (int i{}; i < N; i++)
	{
		a[i]--;
		prev[i] = myHome.get(a[i] + 1, N);
		myHome.update(a[i], i);
	}
	// for (auto& e: prev) printf("%d ", e);
	// putchar('\n');
	std::vector<std::array<int64_t, 4>> queries(N + Q);
	// {1, left, right, q_i}
	// {2, prev, index, -1}
	for (int i{}; i < N; i++)
		queries[i] = {2, prev[i], i, -1};
	for (int i{}; i < Q; i++)
	{
		int com, left, right;
		scanf("%d%d%d", &com, &left, &right);
		left--;
		queries[N + i] = {1, left, right, i};
	}
	std::sort(queries.begin(), queries.end(), [](auto& a, auto& b) {
		if (a[1] != b[1]) return a[1] < b[1];
		else return a[0] < b[0];
		});

	// for (auto& e: queries)
	// {
	// 	for (auto& f: e) printf("%d ", f);
	// 	putchar('\n');
	// }
	RSumQBIT bit(N);
	std::vector<int> ans(Q);
	for (auto& query: queries)
	{
		if (query[0] == 1)
			ans[query[3]] = bit.get(query[1], query[2]);
		else
			bit.update(query[2], 1);
	}
	for (auto& e: ans) printf("%d\n", e);

	return 0;
}
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