Submission #54208

#	Time	Username	Problem	Language	Result	Execution time	Memory
54208		baactree	Pyramid Base (IOI08_pyramid_base)	C++17	35 / 100	3947 ms	58952 KiB

pyramid_base

#include <bits/stdc++.h>
using namespace std;
namespace fio {
	const int BSIZE = 1 << 17;
	unsigned char buffer[BSIZE];
	auto p = buffer + BSIZE;
	inline unsigned char readChar() {
		if (p == buffer + BSIZE) {
			fread(buffer, 1, BSIZE, stdin);
			p = buffer;
		}
		return *p++;
	}
	int readInt() {
		unsigned char c = readChar();
		while (c < '-') {
			c = readChar();
		}
		int ret = 0;
		while (c >= '-') {
			ret = ret * 10 + c - '0';
			c = readChar();
		}
		return ret;
	}
}
typedef long long ll;
ll tree[1 << 21][2];
const ll inf = 0x3f3f3f3f3f3f3f3f;
void push(int nodele, int noderi, int node) {
	tree[node][0] += tree[node][1];
	if (nodele != noderi) {
		tree[node * 2][1] += tree[node][1];
		tree[node * 2 + 1][1] += tree[node][1];
	}
	tree[node][1] = 0;
}
void update(int le, int ri, ll val, int nodele, int noderi, int node) {
	if (tree[node][1])push(nodele, noderi, node);
	if (le > noderi || ri < nodele)return;
	if (le <= nodele && noderi <= ri) {
		tree[node][1] = val;
		push(nodele, noderi, node);
		return;
	}
	int mid = (nodele + noderi) / 2;
	update(le, ri, val, nodele, mid, node * 2);
	update(le, ri, val, mid + 1, noderi, node * 2 + 1);
	tree[node][0] = min(tree[node * 2][0], tree[node * 2 + 1][0]);
}
ll query(int le, int ri, int nodele, int noderi, int node) {
	if (tree[node][1])push(nodele, noderi, node);
	if (le > noderi || ri < nodele)return inf;
	if (le <= nodele && noderi <= ri)return tree[node][0];
	int mid = (nodele + noderi) / 2;
	return min(query(le, ri, nodele, mid, node * 2), query(le, ri, mid + 1, noderi, node * 2 + 1));
}
int n, m, b, p;
vector<tuple<int, int, int> > vec[1000005];
int btree[1000005];
void bupdate(int idx, int val,int k) {
	while (idx <= m - k + 1) {
		btree[idx] += val;
		idx += idx & (-idx);
	}
}
int bquery(int idx) {
	int ret = 0;
	while (idx) {
		ret += btree[idx];
		idx -= idx & (-idx);
	}
	return ret;
}
bool possi(int k) {
	if(b)memset(tree, 0, sizeof(tree));
	else {
		for (int i = 1; i <= m - k + 1; i++)
			btree[i] = 0;
	}
	for (int i = 1; i <= n; i++) {
		for (auto v : vec[i]) {
			int y1, y2, c;
			tie(y1, y2, c) = v;
			if (c > 0) {
				if (b)update(max(1, y1 - k + 1), min(m - k + 1, y2), c, 1, m - k + 1, 1);
				else {
					bupdate(max(1, y1 - k + 1), 1, k);
					bupdate(min(m - k + 1, y2) + 1, -1, k);
				}
			}
		}
		if (i >= k) {
			for (auto v : vec[i - k]) {
				int y1, y2, c;
				tie(y1, y2, c) = v;
				if (c < 0) {
					if (b)update(max(1, y1 - k + 1), min(m - k + 1, y2), c, 1, m - k + 1, 1);
					else {
						bupdate(max(1, y1 - k + 1), 1, k);
						bupdate(min(m - k + 1, y2) + 1, -1, k);
					}
				}
			}
		}
		if (i >= k && (b ? query(1, m - k + 1, 1, m - k + 1, 1) <= b : bquery(m - k + 1) == m - k + 1)) return true;
	}
	return false;
}
int main() {
	//scanf("%d%d%d%d", &n, &m, &b, &p);
	n = fio::readInt();
	m = fio::readInt();
	b = fio::readInt();
	p = fio::readInt();
	for (int i = 0; i < p; i++) {
		int x1, y1, x2, y2, c;
		//scanf("%d%d%d%d%d", &x1, &y1, &x2, &y2, &c);
		x1 = fio::readInt();
		y1 = fio::readInt();
		x2 = fio::readInt();
		y2 = fio::readInt();
		c = fio::readInt();
		vec[x1].emplace_back(y1, y2, b ? c : 1);
		vec[x2].emplace_back(y1, y2, b ? -c : -1);
	}
	int le, ri, ans, mid;
	le = 1;
	ri = m;
	ans = 0;
	while (le <= ri) {
		mid = (le + ri) / 2;
		if (possi(mid)) {
			ans = mid;
			le = mid + 1;
		}
		else ri = mid - 1;
	}
	printf("%d\n", ans);
	return 0;
}

Compilation message (stderr)

pyramid_base.cpp: In function 'unsigned char fio::readChar()':
pyramid_base.cpp:9:9: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
    fread(buffer, 1, BSIZE, stdin);
    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
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• Subtask 10: 7 / 7
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• Subtask 15: 0 / 10