Submission #742753

#	Time	Username	Problem	Language	Result	Execution time	Memory
742753		ToniB	Financial Report (JOI21_financial)	C++14	53 / 100	649 ms	36152 KiB

Main

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 3e5 + 2;
const int OFF = 1 << 20;

int n, d, a[MAXN], ans, dp[7005];
bool ok[7005];
int tour[OFF];
priority_queue<int, vector<int>, greater<int> > pq;
multiset<int> ms;

vector<int> cmp;
map<int, int> um;

int f(int x, int l, int r, int ql, int qr){
	if(ql <= l && r <= qr) return tour[x];
	if(ql > r || l > qr) return 0;
	int mid = (l + r) >> 1;
	return max(f(x * 2 + 1, l, mid, ql, qr), f(x * 2 + 2, mid + 1, r, ql, qr));
}
void upd(int x, int l, int r, int i, int val){
	if(l > i || r < i) return ;
	if(l == r){
		tour[x] = val;
		return ;
	}
	int mid = (l + r) >> 1;
	upd(x * 2 + 1, l, mid, i, val);
	upd(x * 2 + 2, mid + 1, r, i, val);
	tour[x] = max(tour[x * 2 + 1], tour[x * 2 + 2]);
}

int main(){
	cin >> n >> d;
	for(int i = 0; i < n; ++i){
		cin >> a[i];
		cmp.push_back(a[i]);
	}
	sort(cmp.begin(), cmp.end());
	cmp.erase(unique(cmp.begin(), cmp.end()), cmp.end());

	for(int i = 0; i < (int)cmp.size(); ++i) um[cmp[i]] = i;
	for(int i = 0; i < n; ++i) a[i] = um[a[i]];

	if(n < 7005){
		memset(ok, 1, sizeof ok);
		for(int i = 0; i < n; ++i){
			dp[i] = 1;
			for(int j = i - 1; j >= 0; --j){
				if(ok[j] && a[j] < a[i]) dp[i] = max(dp[i], dp[j] + 1);
			}
			// assume [i - d + 1..i] blocks j <= i - d
			if(i - d >= 0){
				int mini = n;
				for(int j = i; j > i - d; --j) mini = min(mini, a[j]);
				for(int j = i - d; j >= 0; --j){
					if(a[j] < mini) ok[j] = 0;
				}
			}
			ans = max(ans, dp[i]);
		}
		cout << ans << "\n";
		return 0;
	}

	for(int i = 0; i < n; ++i){
		int x = 0;
		if(a[i]) x = f(0, 0, n - 1, 0, a[i] - 1);
		upd(0, 0, n - 1, a[i], x + 1);
		ans = max(ans, x + 1);

		ms.insert(a[i]);
		pq.push(a[i]);

		if(i >= d){
			ms.erase(ms.find(a[i - d]));
			int mini = *ms.begin();
			while(!pq.empty() && pq.top() < mini){
				int x = pq.top();
				upd(0, 0, n - 1, x, 0);
				pq.pop();
			}
		}
	}
	cout << ans;
	return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 0 / 12
• Subtask 5: 5 / 5
• Subtask 6: 0 / 35