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Submission #173655

# Submission time Handle Problem Language Result Execution time Memory
173655 2020-01-04T19:27:16 Z Nucleist Palindromes (APIO14_palindrome) C++14
23 / 100
 1000 ms 7760 KB 
#include<bits/stdc++.h> 
using namespace std; 
void expand(string str, int low, int high, auto &set)
{
  // run till str[low.high] is a palindrome
  while (low >= 0 && high < str.length()
      && str[low] == str[high])
  {
    // push all palindromes into the set
    set.insert(str.substr(low, high - low + 1));

    // expand in both directions
    low--, high++;
  }
}
int ans=0;
string a;
vector<int> rabin_karp(string const& s, string const& t) {
    const int p = 31; 
    const int m = 1e9 + 9;
    int S = s.size(), T = t.size();

    vector<long long> p_pow(max(S, T)); 
    p_pow[0] = 1; 
    for (int i = 1; i < (int)p_pow.size(); i++) 
        p_pow[i] = (p_pow[i-1] * p) % m;

    vector<long long> h(T + 1, 0); 
    for (int i = 0; i < T; i++)
        h[i+1] = (h[i] + (t[i] - 'a' + 1) * p_pow[i]) % m; 
    long long h_s = 0; 
    for (int i = 0; i < S; i++) 
        h_s = (h_s + (s[i] - 'a' + 1) * p_pow[i]) % m; 

    vector<int> occurences;
    for (int 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;
}
void allPalindromicSubstrings(string str)
{
  unordered_set<string> set;

  for (int i = 0; i < str.length(); i++)
  {
    expand(str, i, i, set);
    expand(str, i, i + 1, set);
  }
  for (auto i : set)
   ans=max(ans,(int)((rabin_karp(i,a).size())*i.size()));
}

int main() 
{ 
    cin>>a;
    allPalindromicSubstrings(a); 
    cout<<ans;
}

Compilation message

palindrome.cpp: In function 'void allPalindromicSubstrings(std::__cxx11::string)':
palindrome.cpp:47:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < str.length(); i++)
                   ~~^~~~~~~~~~~~~~
palindrome.cpp: In instantiation of 'void expand(std::__cxx11::string, int, int, auto:1&) [with auto:1 = std::unordered_set<std::__cxx11::basic_string<char> >; std::__cxx11::string = std::__cxx11::basic_string<char>]':
palindrome.cpp:49:26:   required from here
palindrome.cpp:6:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (low >= 0 && high < str.length()
                      ~~~~~^~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 252 KB Output is correct
2 Correct 2 ms 256 KB Output is correct
3 Correct 2 ms 256 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 256 KB Output is correct
6 Correct 2 ms 252 KB Output is correct
7 Correct 2 ms 256 KB Output is correct
8 Correct 2 ms 296 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 256 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 420 KB Output is correct
14 Correct 2 ms 256 KB Output is correct
15 Correct 2 ms 256 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 2 ms 256 KB Output is correct
20 Correct 2 ms 256 KB Output is correct
21 Correct 2 ms 380 KB Output is correct
22 Correct 2 ms 256 KB Output is correct
23 Correct 3 ms 256 KB Output is correct
24 Correct 2 ms 348 KB Output is correct
25 Correct 3 ms 380 KB Output is correct
26 Correct 2 ms 256 KB Output is correct
27 Correct 2 ms 256 KB Output is correct
28 Correct 2 ms 256 KB Output is correct
29 Correct 2 ms 296 KB Output is correct
30 Correct 2 ms 256 KB Output is correct
31 Correct 2 ms 376 KB Output is correct
32 Correct 2 ms 256 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 93 ms 956 KB Output is correct
2 Correct 45 ms 672 KB Output is correct
3 Correct 166 ms 948 KB Output is correct
4 Correct 23 ms 404 KB Output is correct
5 Correct 166 ms 944 KB Output is correct
6 Correct 167 ms 928 KB Output is correct
7 Correct 21 ms 796 KB Output is correct
8 Correct 92 ms 888 KB Output is correct
9 Correct 18 ms 376 KB Output is correct
10 Correct 4 ms 376 KB Output is correct
11 Correct 4 ms 400 KB Output is correct
12 Correct 17 ms 632 KB Output is correct

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1050 ms 7352 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 26.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1064 ms 7584 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1073 ms 7760 KB Time limit exceeded
2 Halted 0 ms 0 KB -