Submission #464540

#	Time	Username	Problem	Language	Result	Execution time	Memory
464540		prvocislo	Difference (POI11_roz)	C++17	60 / 100	151 ms	65540 KiB

roz

#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
using namespace std;

int ans = 0;
void solve(const vector<int>& v) // v je indexovane od 1
{
	int last_minus_one = -1;
	vector<int> pf(v.size(), 0), pf_min(v.size(), 0); // prefixove sucty, najmensi prefix doteraz
	for (int i = 1; i < v.size(); i++)
	{
		pf[i] = pf[i - 1] + v[i];
		pf_min[i] = min(pf_min[i - 1], pf[i]);
	}
	for (int i = 1; i < v.size(); i++)
	{
		if (v[i] == -1) last_minus_one = i;
		if (last_minus_one != -1) ans = max(ans, pf[i] - pf_min[last_minus_one - 1]);
	}
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	string s;
	cin >> s;
	vector<vector<vector<int> > > v(26, vector<vector<int> >(26, { 0 }));
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < 26; j++) if (j != s[i] - 'a')
		{
			v[s[i] - 'a'][j].push_back(1);
			v[j][s[i] - 'a'].push_back(-1);
		}
	}
	for (int i = 0; i < 26; i++) for (int j = 0; j < 26; j++) if (j != i)
		solve(v[i][j]);
	cout << ans << "\n";
	return 0;
}

Compilation message (stderr)

roz.cpp: In function 'void solve(const std::vector<int>&)':
roz.cpp:12:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |  for (int i = 1; i < v.size(); i++)
      |                  ~~^~~~~~~~~~
roz.cpp:17:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for (int i = 1; i < v.size(); i++)
      |                  ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10