Submission #263020

#	Time	Username	Problem	Language	Result	Execution time	Memory
263020		ElyesChaabouni	Linear Garden (IOI08_linear_garden)	C++14	0 / 100	165 ms	504 KiB

linear_garden

/*#pragma GCC optimize("O3")*/
#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp> 
//#define ordered_set tree<int, null_type,less<int >, rb_tree_tag,tree_order_statistics_node_update> 
#define eps 1e-9
#define MOD1 998244353
#define MOD2 1000000007
#define INV_10 299473306
#define INF 1000000000
#define PI 3.14159265358979323846
using namespace std;
int dp[2][9][2];
bitset<1000001>a;
int n, m, pp, ll;
int solve()
{
	dp[0][0][0]=1;
	for(int idx = 0; idx < n; idx++)
	{
		for(int d = 0; d < 9; d++)
		{
			for(int b = 0; b < 2; b++)
			{
				if(a.test(idx))
				{
					if(d/3 < 2)
					{
						pp=d/3;
						ll=d%3;
						pp++;
						ll--;
						ll=max(ll, 0);
						dp[(idx+1)%2][pp*3+ll][b]+=dp[idx%2][d][b];
						dp[(idx+1)%2][pp*3+ll][b]%=m;
					}
					if(d%3 < 2)
					{
						pp=d/3;
						ll=d%3;
						pp++;
						ll--;
						ll=max(ll, 0);
						dp[(idx+1)%2][pp*3+ll][1]+=dp[idx%2][d][b];
						dp[(idx+1)%2][pp*3+ll][1]%=m;
					}
				}
				else
				{
					if(d%3 < 2)
					{
						pp=d/3;
						ll=d%3;
						pp++;
						ll--;
						ll=max(ll, 0);
						dp[(idx+1)%2][pp*3+ll][b]+=dp[idx%2][d][b];
						dp[(idx+1)%2][pp*3+ll][b]%=m;
					}
					if(d/3 < 2 && b)
					{
						pp=d/3;
						ll=d%3;
						pp++;
						ll--;
						ll=max(ll, 0);
						dp[(idx+1)%2][pp*3+ll][b]+=dp[idx%2][d][b];
						dp[(idx+1)%2][pp*3+ll][b]%=m;
					}
				}
			}
		}
	}
	int ans=0;
	for(int i = 0; i < 9; i++)
		for(int j = 0; j < 2; j++)
			ans+=dp[n%2][i][j];
	return ans%m;
}
int main()
{
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin >> n >> m;
	char c;
	for(int i = 0; i < n; i++)
	{
		cin >> c;
		if(c=='P')
			a[i]=1;
	}
	for(int i = 0; i <= n; i++)
			for(int k = 0; k < 9; k++)
				for(int l = 0; l < 2; l++)
					dp[i][k][l]=-1;
	cout << solve() << '\n';
}
//size

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