Submission #307086

#	Time	Username	Problem	Language	Result	Execution time	Memory
307086		Rainbowbunny	Brunhilda’s Birthday (BOI13_brunhilda)	C++17	100 / 100	823 ms	236924 KiB

brunhilda

#include <bits/stdc++.h>
#define int long long
#define mp make_pair
#define eb emplace_back
#define fi first
#define se second
using namespace std;
using cd = complex <double>;
 
const long long INF = 1e15;
const int mod = 998244353;//1e9 + 7;//786433;
const double Pi = acos(-1);
 
void Fastio()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
}
 
int m, q, p;
int Seive[20000005], dp[10000005];
 
signed main()
{
	Fastio();
	cin >> m >> q;
	for(int i = 1; i <= m; i++)
	{
		cin >> p;
		for(int j = p - 1; j <= 20000000; j = j + p)
		{
			Seive[j] = max(Seive[j], p - 1);
		}
	}
	for(int i = 20000000; i > 1; i--)
	{
		Seive[i - 1] = max(Seive[i - 1], Seive[i] - 1);
	}
	for(int i = 1; i <= 10000000; i++)
	{
		dp[i] = 999999999;
		dp[i] = dp[i - Seive[i]] + 1;
	}
	while(q--)
	{
		int n;
		cin >> n;
		if(dp[n] >= 10000005)
		{
			cout << "oo\n";
			continue;
		}
		cout << dp[n] << '\n';
	}
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 60 / 60