Submission #1008001

#	Time	Username	Problem	Language	Result	Execution time	Memory
1008001		vjudge1	Miners (IOI07_miners)	C++17	45 / 100	833 ms	860 KiB

miners

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
using namespace std;

const int N = 2e5+1;

int n;
string s;

int main()
{
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	cin >> n >> s;
	if (n <= 20) {
		int sol = 0;
		for (int msk = 0; msk < (1 << n); msk++) {
			int coal = 0;
			vector<int> fr, sc;
			for (int i = 0; i < n; i++) {
				if (msk>>i&1) swap(fr, sc);
			
				fr.push_back(s[i]);
				if (fr.size() == 1)	coal += 1;
				else if (fr.size() == 2) coal += 1+(fr[1] != fr[0]);
				else {
					set<int> cc;
					cc.insert(fr[fr.size()-1]);
					cc.insert(fr[fr.size()-2]);
					cc.insert(fr[fr.size()-3]);
					coal += cc.size();
				}
				
				
				if (msk>>i&1) swap(fr, sc);
			}
			
			sol = max(sol, coal);
		}
		cout << sol;
		return 0;
	}
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 0 / 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