Submission #1166092

#	Time	Username	Problem	Language	Result	Execution time	Memory
1166092		JelalTkm	Palindromes (APIO14_palindrome)	C++20	23 / 100	1096 ms	19300 KiB

palindrome

#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

using namespace std;

#define int long long int

const int N = 1e5 + 10;
const int md = 1e9 + 7;
const int INF = 1e18;

int32_t main(int32_t argc, char *argv[]) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int T = 1;
  // cin >> T;
  while (T--) {
    string s;
    cin >> s;
    int n = (int) s.size();
    s = '#' + s;

    vector<vector<bool>> dp(n + 1, vector<bool> (n + 1));
    vector<int> sz(n + 1);
    unordered_map<string, int> mp;
    int ans = 0;
    for (int i = 1; i <= n; i++) {
      dp[i][i] = 1;
      sz[i] = 1;
      string c = "";
      c += s[i];
      mp[c]++;
      ans = max(ans, mp[c]);
      for (int j = i - 1; j >= 1; j--) {
        c = s[j] + c;
        if (j == i - 1) {
          if (s[j] == s[i]) {
            int cnt = (++mp[c]);
            sz[j] = 2;
            dp[j][i] = 1;
            ans = max(ans, cnt * sz[j]);
          }
        }
        else if (s[i] == s[j] && dp[j + 1][i - 1]) {
          int cnt = (++mp[c]);
          sz[j] = (i - j + 1);
          dp[j][i] = 1;
          ans = max(ans, sz[j] * cnt);
        }
      }
    }

    cout << ans << '\n';
  }

  return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 26
• Subtask 5: 0 / 27