Submission #672528

#	Time	Username	Problem	Language	Result	Execution time	Memory
672528		sudheerays123	Miners (IOI07_miners)	C++17	34 / 100	164 ms	186724 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;

ll dp[N][15][15];
vector<ll> a(N);
ll n;

ll chartoll(char x){
	if(x == 'M') return 1ll;
	if(x == 'B') return 2ll;
	return 3ll;
}

ll score(ll mask , ll cur){
	mask |= (1ll<<cur);
	ll x = __builtin_popcountll(mask);
	return x;
}

ll newmask(ll cur , ll pre){
	ll y = (1ll<<cur);
	if(pre != 0) y |= (1ll<<pre);
	return y;
}

ll go(ll i , ll mask1 , ll mask2 , ll pre1 , ll pre2){

	if(i == n+1) return 0;
	if(dp[i][mask1][mask2] != -1) return dp[i][mask1][mask2];
		
	ll ans = score(mask1,a[i])+go(i+1,newmask(a[i],pre1),mask2,a[i],pre2);
	ans = max(ans,score(mask2,a[i])+go(i+1,mask1,newmask(a[i],pre2),pre1,a[i]));
	
	return dp[i][mask1][mask2] = ans;
}

void solve(){

	string s;
	cin >> n >> s;
	s = ' '+s;
	for(ll i = 1; i <= n; i++) a[i] = chartoll(s[i]);

	// if(n <= 20){

	// 	ll ans = -INF;

	// 	for(ll i = 0; i < (1ll<<n); i++){

	// 		vector<char> mine1,mine2;
	// 		for(ll j = 0; j < n; j++){
	// 			if(i&(1ll<<j)) mine1.push_back(s[j+1]);
	// 			else mine2.push_back(s[j+1]);
	// 		}

	// 		ll score = 0;

	// 		for(ll j = 0; j < mine1.size(); j++){
	// 			set<char> food;
	// 			for(ll k = j; k >= max(0ll,j-2); k--) food.insert(mine1[k]);
	// 			score += food.size();
	// 		}

	// 		for(ll j = 0; j < mine2.size(); j++){
	// 			set<char> food;
	// 			food.insert(mine2[j]);
	// 			for(ll k = j; k >= max(0ll,j-2); k--) food.insert(mine2[k]);
	// 			score += food.size();
	// 		}

	// 		ans = max(ans,score);
	// 	}

	// 	cout << ans;
	// 	return;
	// }

	memset(dp,-1,sizeof dp);

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

int main(){

	fast;

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

	return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 0 / 8
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 0 / 8
• Subtask 11: 0 / 8
• Subtask 12: 0 / 8