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Submission #977806

# Submission time Handle Problem Language Result Execution time Memory
977806 2024-05-08T11:17:29 Z duckindog Palindromic Partitions (CEOI17_palindromic) C++17
0 / 100
 3 ms 8796 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1'000'000 + 10;
int t;

using ull = unsigned long long;
ull h[N], pw[N];
ull get(int l, int r) { return h[r] - h[l - 1] * pw[r - l + 1]; }

int32_t main() { 
  cin.tie(0)->sync_with_stdio(0);

  pw[0] = 1;
  for (int i = 1; i <= 1'000'000; ++i) pw[i] = pw[i - 1] * 19937;

  cin >> t;
  while (t--) { 
    string s; cin >> s;
    for (int i = 1; i <= s.size(); ++i) h[i] = h[i - 1] * 19937 + s[i - 1];
    
    int l = 1, r = s.size();
    int answer = 0;
    
    int len = 0;
    while (true) {
      if (l + len >= r - len) { answer += 1; break; }
      
      if (get(l, l + len) != get(r - len, r)) len += 1;
      else { 
        answer += 2;
        l = l + len + 1; r = r - len - 1;
        len = 0;
      }
    }

    cout << answer << "\n";
  }
}

Compilation message

palindromic.cpp: In function 'int32_t main()':
palindromic.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i = 1; i <= s.size(); ++i) h[i] = h[i - 1] * 19937 + s[i - 1];
      |                     ~~^~~~~~~~~~~

Subtask #1
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 8796 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 8796 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 8796 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 8796 KB Output isn't correct
2 Halted 0 ms 0 KB -