제출 #530750

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
530750		perchuts	Miners (IOI07_miners)	C++17	17 / 100	1588 ms	716 KiB

miners

#include <bits/stdc++.h>
#define maxn (int)(1e5+51)
#define all(x) x.begin(), x.end()
#define sz(x) (int) x.size()
#define endl '\n'
#define ll long long
#define pb push_back
#define ull unsigned long long
#define ii pair<int,int>
#define iii tuple<int,int,int>
#define inf 2000000001
#define mod 1000000007 //998244353
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

using namespace std;

template<typename X, typename Y> bool ckmin(X& x, const Y& y) { return (y < x) ? (x=y,1):0; }
template<typename X, typename Y> bool ckmax(X& x, const Y& y) { return (x < y) ? (x=y,1):0; }

map<pair<string,string>,int>dp[2];

int main(){_
    int n;cin>>n;
    string s;cin>>s;
    dp[0][{"",""}] = -1;
    for(int i=1;i<=n;++i){
        for(auto [a,b]:dp[(i-1)&1]){
            auto [x,y] = a;
            if(x==y&&sz(x)==0)b = 0;
            int j = max(0,sz(x)-2),cntm=0,cntf=0,cntb=0;
            string newa,newb;
            while(j<sz(x))newa+=x[j++]; 
            newa+=s[i];
            for(auto u:newa){
                cntm|=u=='M',cntf|=u=='F',cntb|=u=='B';
            }
            ckmax(dp[i&1][{newa,y}],b+cntm+cntf+cntb); 
            j = max(0,sz(y)-2), cntm = cntf = cntb = 0;
            while(j<sz(y))newb+=y[j++];
            newb+=s[i];
            for(auto u:newb){
                cntm|=u=='M',cntf|=u=='F',cntb|=u=='B';
            }
            ckmax(dp[i&1][{x,newb}],b+cntm+cntf+cntb); 
        }
    }
    int ans = 0;
    for(auto [a,b]:dp[n&1])ckmax(ans,b);
    cout<<ans<<endl; 
}

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