Submission #99534

#	Time	Username	Problem	Language	Result	Execution time	Memory
99534		figter001	Linear Garden (IOI08_linear_garden)	C++11	90 / 100	154 ms	66560 KiB

linear_garden

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const int nax = 1e6+5;

int n,mod;
string s;
int dp[3][3][nax];

int calc(int idx,int a,int b){
	if(a < 0)a = 0;
	if(b < 0)b = 0;
	if(a == 3)return 0;
	if(b == 3)return 0;
	if(idx == n)
		return 1;
	if(dp[a][b][idx] != -1)
		return dp[a][b][idx];
	dp[a][b][idx] = (calc(idx+1,a+1,b-1) + calc(idx+1,a-1,b+1)) % mod;
	return dp[a][b][idx];
}

int ans;

void solve(int idx,int a,int b){
	if(a < 0)a = 0;
	if(b < 0)b = 0;
	if(a == 3)return;
	if(b == 3)return;
	if(idx == n)
		return;
	if(s[idx] == 'P'){
		ans = (ans + calc(idx+1,a+1,b-1)) % mod;
		solve(idx+1,a-1,b+1);
	}else{
		solve(idx+1,a+1,b-1);
	}
}

int main(){
	memset(dp,-1,sizeof(dp));
	cin>>n>>mod>>s;
	solve(0,0,0);
	cout << (ans + 1)%mod << endl;
}

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