Submission #341351

#	Time	Username	Problem	Language	Result	Execution time	Memory
341351		hackxsaras	Miners (IOI07_miners)	C++14	18 / 100	600 ms	211992 KiB

miners

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

using namespace __gnu_pbds;
using namespace std;


#define ll long long
#define pb push_back
int n;
string s;



gp_hash_table<ll, ll> dp;

ll hashit(int &k, deque<char> &a, deque<char> &b){
	ll ans = 0;
	for(int i=0;i<a.size();i++){
		ans ^= (a[i] - 'A');
	}
	for(int j=0;j<b.size();j++){
		ans ^= (b[j] - 'A');
	}

	return (k*n) + (ans);
}
int recurse(int index, deque<char> &a, deque<char> &b){
	
	if(index == n)return 0;

	if(dp[hashit(index, a, b)])return dp[hashit(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[hashit(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, ep2;
	cout<<recurse(0, ep, ep2);
}

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 'long long int hashit(int&, std::deque<char>&, std::deque<char>&)':
miners.cpp:20:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |  for(int i=0;i<a.size();i++){
      |              ~^~~~~~~~~
miners.cpp:23:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for(int j=0;j<b.size();j++){
      |              ~^~~~~~~~~
miners.cpp: In function 'int recurse(int, std::deque<char>&, std::deque<char>&)':
miners.cpp:37:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |  for(int i=0;i<a.size();i++)sa.insert(a[i]);
      |              ~^~~~~~~~~
miners.cpp:38:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |  for(int i=0;i<b.size();i++)sb.insert(b[i]);
      |              ~^~~~~~~~~

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