이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define OPTM ios_base::sync_with_stdio(0); cin.tie(0);
#define INF int(1e9+7)
#define ln '\n'
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define us unsigned short
#define FOR(i,s,n) for (int i = s; i < n; i++)
#define FORR(i,n,s) for (int i = n; i > s; i--)
#define FORX(u, arr) for (auto u : arr)
#define PB push_back
#define F first
#define S second
#define PII pair<int, int>
#define PLL pair<ll, ll>
#define UM unordered_map
#define US unordered_set
#define PQ priority_queue
#define ALL(v) v.begin(), v.end()
const ll LLINF = 1e18+1;
#define int long long
const int MAXN = 1e6+5;
int n,MOD;
string s;
int p[MAXN];
signed main() {
OPTM;
cin >> n >> MOD >> s;
p[0] = 1LL;
FOR(i,1,n+1) p[i] = (p[i-1]*2LL)%MOD;
int lb = 0, ub = 0, cur = 0, res = 1LL;
FOR(i,0,n) {
if (s[i] == 'L') {
cur++;
ub = max(ub,cur);
}
else {
int tcur = cur+1;
int tub = max(ub,tcur);
int rem = n-i-1;
if (tub-lb == 1) res = (res+p[(rem+1)/2]+p[rem/2]-1LL+MOD)%MOD;
else if (tub-lb == 2) {
if (tcur == (tub+lb)/2) res = (res+p[(rem+1)/2])%MOD;
else res = (res+p[rem/2])%MOD;
}
cur--;
lb = min(lb,cur);
}
}
cout << res;
}
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