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>
#pragma GCC optimize("Ofast")
using namespace std;
const int N=1000005;
int pw[N],mod,n;
string s;
int add(int a,int b){
return a+b-(a+b>=mod?mod:0);
}
int index(){
int mn=0,mx=0,d=0,res=0;
for(int i=0;i<n;i++){
if(s[i]=='L'){
mn=min(mn,d-1);
d--;
}else{
int x=0,mn2=min(mn,d-1),_d=d-1,_n=n-i-1;
if(mx<=1&&mn2>=-1)res=add(res,pw[(_n+(_d==0))/2]),x++;
if(mx<=2&&mn2>=0)res=add(res,pw[(_n+(_d==1))/2]),x++;
if(mx<=0&&mn2>=-2)res=add(res,pw[(_n+(_d==-1))/2]),x++;
if(x>1)res=add(res,mod-1);
mx=max(mx,d+1);
d++;
}
}
return add(res,1);
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
pw[0]=1;
for(int i=1;i<N;i++)pw[i]=add(pw[i-1],pw[i-1]);
cin>>n>>mod>>s;
cout<<index();
return 0;
}
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