This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
const int N = 1e6 + 3;
int mod;
int n;
int a[N];
//int dp[2][2][2][N];
int rec(int idx, int p1, int p2, bool less){
if(idx == n){
return 1;
}
int ret = 0;
if(p1==-1||p2==-1||p1!=p2){
for(int i = 0; i <= less?1:a[idx]; i++){
ret += rec(idx+1,i,p1,less||(i<a[idx]));
}
} else if(p1 == 0){
if(a[idx]==1||less)ret+=rec(idx+1,1,p1,less);
}
else{
ret+=rec(idx+1,0,p1,less||a[idx]);
}
return ret%mod;
}
int main()
{
cin>>n>>mod;
for(int i = 0; i < n; i++){
char ch;
cin>>ch;
a[i]=ch=='P';
}
cout<<rec(0,-1,-1,0);
return 0;
}
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