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;
int n;
string s; /// M-0, B-1, F-2
long long rec(int indx, int mine, int last11, int last12, int last21, int last22){
long long res = 0;
set<int>st;
if(indx == n)return 0;
if(mine == 1){
if(last11 != -1)st.insert(last11);
if(last12 != -1)st.insert(last12);
last12 = last11;
last11 = s[indx];
}
else{
if(last21 != -1)st.insert(last21);
if(last22 != -1)st.insert(last22);
last22 = last21;
last21 = s[indx];
}
st.insert(s[indx]);
res = st.size() + max(rec(indx + 1, 1, last11, last12, last21, last22), rec(indx + 1, 2, last11, last12, last21, last22));
return res;
}
int main()
{
cin >> n >> s;
cout << max(rec(0, 1, -1, -1, -1, -1), rec(0, 2, -1, -1, -1, -1));
}
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