Submission #727163

#	Time	Username	Problem	Language	Result	Execution time	Memory
727163		NeroZein	Financial Report (JOI21_financial)	C++17	0 / 100	87 ms	192512 KiB

Main

#include "bits/stdc++.h"
using namespace std;

#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif

const int N = 7005;

int a[N];
vector<int> v[N]; 

int n, d;
int dp[N][N]; 
int bt (int id, int mx) {
	if (id == n) return 0; 
	int& ret = dp[id][mx];
	if (ret != -1) {
		return ret;
	}
	if (a[id] <= mx) {
		return ret = bt(id + 1, mx); 
	}
	auto it = lower_bound(v[mx].begin(), v[mx].end(), id);
	if (mx) {
		if (it == v[mx].begin()) return 0; 
		it--; 
		if (id - *it > d) return 0; 		
	}
	ret = max(bt(id + 1, mx), bt(id + 1, a[id]) + 1);
	return ret;
}

signed main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin >> n >> d;
	vector<int> b(n);
	for (int i = 0; i < n; ++i) {
		cin >> a[i];
		b[i] = a[i];
	}
	sort(b.begin(), b.end());
	b.resize(unique(b.begin(), b.end()) - b.begin());
	for (int i = 0; i < n; ++i) {
		a[i] = lower_bound(b.begin(), b.end(), a[i]) - b.begin() + 1; 
	}
	memset(dp, -1, sizeof dp);
	for (int i = 0; i < n; ++i) {
		v[a[i]].push_back(i); 
	}
	cout << bt(0, 0) << '\n';
	return 0;
}

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