Submission #899536

#	Time	Username	Problem	Language	Result	Execution time	Memory
899536		Nonoze	Miners (IOI07_miners)	C++17	100 / 100	1286 ms	458464 KiB

miners

#include <bits/stdc++.h>
#define sz(x) (int)(x.size())

using namespace std;

int n;
string seq;
vector<vector<vector<vector<vector<int>>>>> memo;

int dp(int empl, int prec11, int prec12, int prec21, int prec22) {
	if (empl>=n) return 0;
	if (memo[empl][prec11][prec12][prec21][prec22]!=-1) {
		return memo[empl][prec11][prec12][prec21][prec22];
	}
	int vaut=seq[empl];
	int s1=dp(empl+1, vaut, prec11, prec21, prec22);
	int s2=dp(empl+1, prec11, prec12, vaut, prec21);

	set<int> f1, f2;
	f1.insert(vaut), f2.insert(vaut);
	if (prec11!=0) f1.insert(prec11);
	if (prec12!=0) f1.insert(prec12);
	if (prec21!=0) f2.insert(prec21);
	if (prec22!=0) f2.insert(prec22);
	s1+=f1.size();
	s2+=f2.size();
	return memo[empl][prec11][prec12][prec21][prec22]=max(s1, s2);
}

void solve() {
	cin >> n;
	cin >> seq;
	memo.clear();
	memo.resize(n, vector<vector<vector<vector<int>>>>(4,
	vector<vector<vector<int>>> (4, vector<vector<int>> (4, vector<int>(4, -1)))));
	
	for (auto &u: seq) {
		if (u=='M') u=1;
		else if (u=='F') u=2;
		else u=3;
	}
	cout << dp(0, 0, 0, 0, 0) << endl;
	return;
}


signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int tt=1;// cin >> tt;
	while(tt--) solve();
	return 0;
}

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