Submission #341343

#	Time	Username	Problem	Language	Result	Execution time	Memory
341343		hackxsaras	Miners (IOI07_miners)	C++14	68 / 100	1617 ms	524292 KiB

miners

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back
int n;
string s;
map<pair<int, pair<deque<char>, deque<char>>>, int> dp;
int recurse(int index, deque<char> a, deque<char> b){
	
	if(index == n)return 0;

	if(dp[{index, {a, b}}])return dp[{index, {a, b}}];

	set<int> sa, sb;

	for(int i=0;i<a.size();i++)sa.insert(a[i]);
	for(int i=0;i<b.size();i++)sb.insert(b[i]);

	deque<char> qa = a, qb = b;

	if(qa.size() == 2)qa.pop_front();
	if(qb.size() == 2)qb.pop_front();
	
	qa.pb(s[index]);
	qb.pb(s[index]);
	sa.insert(s[index]);
	sb.insert(s[index]);


	return dp[{index, {a, b}}] = max(sa.size() + recurse(index+1, qa, b) , sb.size() + recurse(index+1, a, qb));
}
void solve(){
	cin >> n;
	cin >> s;
	deque<char> ep;
	cout<<recurse(0, ep, ep);
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int t = 1;
	
	// cin>>t;
	
	while(t--){
		solve();
	}

	return 0;
}

Compilation message (stderr)

miners.cpp: In function 'int recurse(int, std::deque<char>, std::deque<char>)':
miners.cpp:17:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for(int i=0;i<a.size();i++)sa.insert(a[i]);
      |              ~^~~~~~~~~
miners.cpp:18:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |  for(int i=0;i<b.size();i++)sb.insert(b[i]);
      |              ~^~~~~~~~~

• 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: 0 / 8
• Subtask 10: 0 / 8
• Subtask 11: 0 / 8
• Subtask 12: 0 / 8