Submission #899506

#	Time	Username	Problem	Language	Result	Execution time	Memory
899506		Nonoze	Miners (IOI07_miners)	C++17	92 / 100	1529 ms	238472 KiB

miners

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define int long long
#define sz(x) (int)(x.size())

using namespace std;
using namespace __gnu_pbds;

typedef
tree<
  int,
  null_type,
  less<int>,
  rb_tree_tag,
  tree_order_statistics_node_update>
ordered_set;

int n, k, m;
string seq;
map<char, int> vaut;
map<pair<int, pair<pair<int, int>, pair<int, int>>>, int> memo;

int dp(int empl, pair<int, int> prec1, pair<int, int> prec2) {
	if (empl>=n) return 0;
	if (memo.count({empl, {prec1, prec2}})) return memo[{empl, {prec1, prec2}}];
	
	int s1=dp(empl+1, {prec1.second, vaut[seq[empl]]}, prec2);
	int s2=dp(empl+1, prec1, {prec2.second, vaut[seq[empl]]});

	map<int, int> mp1;
	mp1[vaut[seq[empl]]]++;
	if (prec1.first!=-1) mp1[prec1.first]++;
	if (prec1.second!=-1) mp1[prec1.second]++;
	map<int, int> mp2;
	mp2[vaut[seq[empl]]]++;
	if (prec2.first!=-1) mp2[prec2.first]++;
	if (prec2.second!=-1) mp2[prec2.second]++;
	s1+=mp1.size();
	s2+=mp2.size();
	return memo[{empl, {prec1, prec2}}]=max(s1, s2);
}

void solve() {
	vaut['M']=0, vaut['F']=1, vaut['B']=2;
	cin >> n;
	cin >> seq;
	memo.clear();
	cout << dp(0, {-1, -1}, {-1, -1}) << 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: 0 / 8