제출 #672275

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
672275		sudheerays123	Miners (IOI07_miners)	C++17	9 / 100	158 ms	214188 KiB

miners

#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long int
const ll N = 1e5+5 , INF = 1e18 , MOD = 1e9+7;

vector<ll> mine1,mine2;
ll dp[N][(1ll<<4)][(1ll<<4)];
ll n;
string s;

ll chartoll(char x){
	if(x == 'M') return 0;
	else if(x == 'B') return 1;
	return 2;
}

ll go(ll i , ll mask1 , ll mask2){

	if(i == n+1) return 0;
	if(dp[i][mask1][mask2] != -1) return dp[i][mask1][mask2];

	ll ans = -INF;

	ll curmask = mask1;
	curmask |= (1ll<<chartoll(s[i]));
	ll c1 = __builtin_popcount(curmask);

	ll newmask1 = (1ll<<chartoll(s[i]));
	if(mine1.size() >= 1) newmask1 |= (1ll<<mine1[mine1.back()]);
	mine1.push_back(chartoll(s[i]));

	ans = max(ans,c1+go(i+1,newmask1,mask2));

	mine1.pop_back();

	curmask = mask2;
	curmask |= (1ll<<chartoll(s[i]));
	ll c2 = __builtin_popcount(curmask);

	ll newmask2 = (1ll<<chartoll(s[i]));
	if(mine2.size() >= 1) newmask2 |= (1ll<<mine2[mine2.back()]);
	mine2.push_back(chartoll(s[i]));

	ans = max(ans,c2+go(i+1,mask1,newmask2));

	mine2.pop_back();

	return dp[i][mask1][mask2] = ans;
}

void solve(){

	cin >> n >> s;
	s = ' '+s;

	memset(dp,-1,sizeof dp);

	cout << go(1,0,0)-1;
}

int main(){

	fast;

	ll tc = 1;
	// cin >> tc;
	while(tc--) solve();

	return 0;
}

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