#include <bits/stdc++.h>
using namespace std;
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#define flash ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define debug(x) cerr << " - " << #x << ": " << x << endl;
#define debugs(x, y) cerr << " - " << #x << ": " << x << " " << #y << ": " << y << endl;
#define all(x) (x).begin(),(x).end()
#define sz(x) (ll)x.size()
#define ll long long
#define INF 1000000000
#define MOD 1000000007
#define pb push_back
#define ve vector<ll>
#define dos pair<ll,ll>
#define vedos vector<dos>
#define rand mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
struct greateri
{
template<class T>
bool operator()(T const &a, T const &b) const { return a > b; }
};
vector<ll> rabin_karp(string const& s, string const& t) {
const ll p = 31;
const ll m = 1e9 + 9;
ll S = s.size(), T = t.size();
vector<long long> p_pow(max(S, T));
p_pow[0] = 1;
for (ll i = 1; i < (ll)p_pow.size(); i++)
p_pow[i] = (p_pow[i-1] * p) % m;
vector<long long> h(T + 1, 0);
for (ll i = 0; i < T; i++)
h[i+1] = (h[i] + (t[i] - 'a' + 1) * p_pow[i]) % m;
long long h_s = 0;
for (ll i = 0; i < S; i++)
h_s = (h_s + (s[i] - 'a' + 1) * p_pow[i]) % m;
vector<ll> occurences;
for (ll i = 0; i + S - 1 < T; i++) {
long long cur_h = (h[i+S] + m - h[i]) % m;
if (cur_h == h_s * p_pow[i] % m)
occurences.push_back(i);
}
return occurences;
}
int main()
{
//flash;
string a;
cin>>a;
ll ans=0;
for (ll i = 0; i < a.size(); ++i)
{
for (ll j = i; j < a.size(); ++j)
{
string dol;
ll ka=0;
for (ll k = i; k <= j; ++k)
{
dol+=a[k];
}
string hey=dol;
reverse(hey.begin(),hey.end());
if(hey==dol)
{
ve hi = rabin_karp(dol,a);
ka=hi.size();
ans=max(ans,ka*(j-i+1));
}
}
}
cout<<ans;
return 0;
}
//code the AC sol !
// BS/queue/map
Compilation message
palindrome.cpp:4:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
#pragma GCC optimization ("O3")
palindrome.cpp:5:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
#pragma GCC optimization ("unroll-loops")
palindrome.cpp: In function 'int main()':
palindrome.cpp:55:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (ll i = 0; i < a.size(); ++i)
~~^~~~~~~~~~
palindrome.cpp:57:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (ll j = i; j < a.size(); ++j)
~~^~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
376 KB |
Output is correct |
3 |
Correct |
2 ms |
256 KB |
Output is correct |
4 |
Correct |
2 ms |
256 KB |
Output is correct |
5 |
Correct |
2 ms |
376 KB |
Output is correct |
6 |
Correct |
2 ms |
256 KB |
Output is correct |
7 |
Correct |
2 ms |
380 KB |
Output is correct |
8 |
Correct |
2 ms |
376 KB |
Output is correct |
9 |
Correct |
2 ms |
256 KB |
Output is correct |
10 |
Correct |
2 ms |
256 KB |
Output is correct |
11 |
Correct |
2 ms |
376 KB |
Output is correct |
12 |
Correct |
2 ms |
376 KB |
Output is correct |
13 |
Correct |
2 ms |
376 KB |
Output is correct |
14 |
Correct |
2 ms |
256 KB |
Output is correct |
15 |
Correct |
2 ms |
376 KB |
Output is correct |
16 |
Correct |
2 ms |
256 KB |
Output is correct |
17 |
Correct |
2 ms |
256 KB |
Output is correct |
18 |
Correct |
2 ms |
256 KB |
Output is correct |
19 |
Correct |
9 ms |
256 KB |
Output is correct |
20 |
Correct |
9 ms |
376 KB |
Output is correct |
21 |
Correct |
5 ms |
376 KB |
Output is correct |
22 |
Correct |
4 ms |
256 KB |
Output is correct |
23 |
Correct |
18 ms |
256 KB |
Output is correct |
24 |
Correct |
7 ms |
376 KB |
Output is correct |
25 |
Correct |
16 ms |
376 KB |
Output is correct |
26 |
Correct |
5 ms |
376 KB |
Output is correct |
27 |
Correct |
5 ms |
380 KB |
Output is correct |
28 |
Correct |
8 ms |
256 KB |
Output is correct |
29 |
Correct |
5 ms |
256 KB |
Output is correct |
30 |
Correct |
4 ms |
376 KB |
Output is correct |
31 |
Correct |
3 ms |
256 KB |
Output is correct |
32 |
Correct |
5 ms |
256 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
1081 ms |
376 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
1086 ms |
764 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
1090 ms |
3320 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
1079 ms |
8768 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |