Submission #197950

#	Time	Username	Problem	Language	Result	Execution time	Memory
197950		QCFium	Street Lamps (APIO19_street_lamps)	C++14	100 / 100	3555 ms	90732 KiB

street_lamps

#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}
int64_t rs64() {
	long long n;
	scanf("%lld", &n);
	return n;
}

struct AVL {
	struct Node {
		Node *l;
		Node *r;
		int key;
		int val;
		int sum;
		int size;
		int height;
		Node *fetch() {
			size = 1 + l->size + r->size;
			height = 1 + std::max(l->height, r->height);
			sum = val + l->sum + r->sum;
			return this;
		}
		Node *rotate_l() {
			Node *new_root = r;
			r = new_root->l;
			new_root->l = this;
			return fetch(), new_root->fetch();
		}
		Node *rotate_r() {
			Node *new_root = l;
			l = new_root->r;
			new_root->r = this;
			return fetch(), new_root->fetch();
		}
		int height_diff() { return l->height - r->height; }
		Node *balance() {
			int dif = height_diff();
			if (dif == 2) {
				if (l->height_diff() < 0) l = l->rotate_l();
				return rotate_r();
			} else if (dif == -2) {
				if (r->height_diff() > 0) r = r->rotate_r();
				return rotate_l();
			} else return fetch();
		}
	};
	static Node *nodes, *NONE;
	static int head;
	Node *root = NONE;
	AVL() {
		if (!head) nodes[head++] = {NONE, NONE, 0, 0, 0, 0, 0};
	}
	Node *add(Node *node, int index, int val) {
		if (node == NONE) return &(nodes[head++] = {NONE, NONE, index, val, val, 1, 1});
		if (index < node->key) node->l = add(node->l, index, val);
		else if (index > node->key) node->r = add(node->r, index, val);
		else node->val += val;
		return node->balance();
	}
	int sum(Node *node, int r) {
		if (node == NONE) return 0;
		if (r > node->key) return node->val + node->l->sum + sum(node->r, r);
		else return sum(node->l, r);
	}
	void add(int index, int val) { root = add(root, index, val); }
	int sum(int r) { return sum(root, r); }
};
AVL::Node *AVL::nodes = (Node *) malloc(sizeof(Node) * 10000000), *AVL::NONE = nodes;
int AVL::head = 0;

struct SegTree2D {
	std::vector<AVL> data;
	int n;
	SegTree2D (int h_, int w_) : n(h_) {
		data.resize(h_ + 1);
	}
	void add(int i, int j, int val) {
		for (i++; i <= n; i += i & -i) data[i].add(j, val);
	}
	int sum(int x, int y) {
		int res = 0;
		for (; x; x -= x & -x) res += data[x].sum(y);
		return res;
	}
};

int main() {
	int n = ri(), q = ri();
	std::vector<bool> state(n);
	{
		std::string s;
		std::cin >> s;
		for (int i = 0; i < n; i++) state[i] = s[i] == '1';
	}
	std::set<std::pair<int, int> > range;
	
	SegTree2D tree(n + 1, n + 1);
	auto add = [&] (int l, int r, int val) {
		tree.add(l, 0, val);
		if (r < n) tree.add(l, r + 1, -val);
	};
	int time = 0;
	auto toggle = [&] (int i) {
		if (state[i]) {
			auto itr = std::prev(range.upper_bound({i, 1000000000}));
			if (itr->first < i) add(itr->first, i, q - time), range.insert({itr->first, i});
			if (i + 1 < itr->second) add(i + 1, itr->second, q - time), range.insert({i + 1, itr->second});
			add(itr->first, itr->second, time - q);
			range.erase(itr);
		} else {
			auto itr = range.lower_bound({i, 0});
			int l = i, r = i + 1;
			if (itr != range.end() && itr->first == r) r = itr->second, add(itr->first, itr->second, time - q), range.erase(itr++);
			if (itr != range.begin() && (--itr)->second == l) l = itr->first, add(itr->first, itr->second, time - q), range.erase(itr);
			add(l, r, q - time);
			range.insert({l, r});
		}
		state[i] = !state[i];
	};
	for (int i = 0; i < n; ) {
		for (; i < n && !state[i]; i++);
		if (i == n) break;
		int old_i = i;
		for (; i < n && state[i]; i++);
		range.insert({old_i, i});
		add(old_i, i, q);
	}
	
	
	for (int i = 0; i < q; i++) {
		time++;
		std::string type;
		std::cin >> type;
		if (type == "toggle") {
			int i = ri() - 1;
			toggle(i);
		} else if (type == "query") {
			int l = ri() - 1;
			int r = ri() - 1;
			int sum = tree.sum(l + 1, r + 1);
			auto itr = range.upper_bound({l, 1000000000});
			if (itr != range.begin() && std::prev(itr)->first <= l && std::prev(itr)->second >= r) sum -= q - i - 1;
			std::cout << sum << std::endl;
		}
	}
	
	
	return 0;
}

Compilation message (stderr)

street_lamps.cpp: In function 'int ri()':
street_lamps.cpp:5:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
street_lamps.cpp: In function 'int64_t rs64()':
street_lamps.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld", &n);
  ~~~~~^~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20