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>
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;
void setIO() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
int n;
string s;
ll dp[100001][4][4][4][4];
map<char, int> val;
ll f(int pos, int f1, int s1, int f2, int s2) {
if(pos == n) return 0;
if(dp[pos][f1][s1][f2][s2] != -1) return dp[pos][f1][s1][f2][s2];
ll ans = 0;
int curr = val[s[pos]];
set<int> st1, st2;
st1.insert(curr);
st2.insert(curr);
if(f1 != 0) st1.insert(f1);
if(s1 != 0) st1.insert(s1);
if(f2 != 0) st2.insert(f2);
if(s2 != 0) st2.insert(s2);
ans = max(
st1.size() + f(pos+1, curr, f1, f2, s2),
st2.size() + f(pos+1, f1, s1, curr, f2)
);
return dp[pos][f1][s1][f2][s2] = ans;
}
int32_t main() {
setIO();
memset(dp, -1, sizeof(dp));
val['M'] = 1;
val['B'] = 2;
val['F'] = 3;
cin >> n >> s;
cout << f(0, 0, 0, 0, 0) << '\n';
return 0;
}
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