Submission #555972

#	Time	Username	Problem	Language	Result	Execution time	Memory
555972		hollwo_pelw	Palindromes (APIO14_palindrome)	C++17	100 / 100	24 ms	34948 KiB

palindrome

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

using namespace std;
// using namespace __gnu_cxx;
// using namespace __gnu_pbds;

void Hollwo_Pelw();

signed main(){
#ifndef hollwo_pelw_local
	if (fopen("hollwo_pelw.inp", "r"))
		assert(freopen("hollwo_pelw.inp", "r", stdin)), assert(freopen("hollwo_pelw.out", "w", stdout));
#else
	using namespace chrono;
	auto start = steady_clock::now();
#endif
	cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
	int testcases = 1;
	// cin >> testcases;
	for (int test = 1; test <= testcases; test++){
		// cout << "Case #" << test << ": ";
		Hollwo_Pelw();
	}
#ifdef hollwo_pelw_local
	auto end = steady_clock::now();
	cout << "\nExecution time : " << duration_cast<milliseconds> (end - start).count() << "[ms]" << endl;
#endif
}

const int N = 3e5 + 5;

int n, siz[N], cnt[N], slink[N], tr[N][26], nnode = 1;
char s[N];

void Hollwo_Pelw(){
	cin >> (s + 1), n = strlen(s + 1);
	siz[0] = -1;
	for (int i = 1, c = 1; i <= n; i++) {
		while (s[i] != s[i - siz[c] - 1])
			c = slink[c];

		if (!tr[c][s[i] - 'a']) {
			int p = slink[c];
			while (s[i] != s[i - siz[p] - 1])
				p = slink[p];
			p = max(1, tr[p][s[i] - 'a']);

			tr[c][s[i] - 'a'] = ++ nnode;
			slink[nnode] = p, siz[nnode] = siz[c] + 2;
		}
		cnt[c = tr[c][s[i] - 'a']] ++;
	}

	long long res = 0;

	for (int i = nnode; i; i--) {
		cnt[slink[i]] += cnt[i];
		res = max(res, 1ll * cnt[i] * siz[i]);
	}

	cout << res << '\n';
}

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 24 / 24
• Subtask 4: 26 / 26
• Subtask 5: 27 / 27