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Submission #348405

# Submission time Handle Problem Language Result Execution time Memory
348405 2021-01-15T00:12:03 Z elizarv Palindromes (APIO14_palindrome) C++14
100 / 100
 75 ms 63680 KB 
#include <bits/stdc++.h>
using namespace std;
void debug() {cout<<endl;}
template<typename T,typename... Args>
void debug(T a,Args... args) {cout<<a<<" ";debug(args...);}
#define forn(i,a,b) for(int i=a;i<b;++i)
#define SZ(x) int(x.size())
#define pb push_back
#define F first
#define S second
#define endl "\n"
typedef long long ll;
typedef pair<int, int> pii;

const int alfa = 26;
const char L = 'a';

struct node {
  int next[alfa], link, len;
  ll cnt;
  node(int x, int l = 0, ll c = 1): len(x), link(l), cnt(c){
    memset(next, 0, sizeof next);
  }
  int& operator[](int i) { return next[i]; }
};

struct palindromic_tree {
  vector<node> tree;
  string s;
  int n;
  int last;
  palindromic_tree(string t = ""){
    n = 0;
    tree.pb(node(-1));
    tree.pb(node(0));
    for(auto &c: t)add_char(c);
  }

  int getlink(int p){
    while(s[n - tree[p].len - 1] != s[n])p = tree[p].link;
    return p;
  }

  void add_char(char ch){
    s.pb(ch);
    int p = getlink(last), c = ch - L;
    if(!tree[p][c]){
      int link = getlink(tree[p].link);
      link = max(1, tree[link][c]);
      tree[p][c] = SZ(tree);
      tree.pb(node(tree[p].len + 2,link, 0));
    }
    last = tree[p][c];
    tree[last].cnt++;
    n++;
  }

  ll getans(){
    ll ans = 0;
    for(int i = tree.size()-1; i; i--){
      ll aux = 1ll * tree[i].len * tree[i].cnt;
      ans = max(ans, aux);
      int par = tree[i].link;
      tree[par].cnt += tree[i].cnt;
    }
    return ans;
  }
};


int main() {
  ios::sync_with_stdio(0); cin.tie(0);

  string s;
  cin >> s;
  palindromic_tree pt(s);

  cout << pt.getans() << endl;


  

}

Compilation message

palindrome.cpp: In constructor 'node::node(int, int, ll)':
palindrome.cpp:19:25: warning: 'node::len' will be initialized after [-Wreorder]
   19 |   int next[alfa], link, len;
      |                         ^~~
palindrome.cpp:19:19: warning:   'int node::link' [-Wreorder]
   19 |   int next[alfa], link, len;
      |                   ^~~~
palindrome.cpp:21:3: warning:   when initialized here [-Wreorder]
   21 |   node(int x, int l = 0, ll c = 1): len(x), link(l), cnt(c){
      |   ^~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 0 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 0 ms 364 KB Output is correct
5 Correct 0 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 0 ms 364 KB Output is correct
8 Correct 0 ms 364 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 0 ms 364 KB Output is correct
11 Correct 0 ms 364 KB Output is correct
12 Correct 0 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 0 ms 364 KB Output is correct
16 Correct 0 ms 364 KB Output is correct
17 Correct 0 ms 364 KB Output is correct
18 Correct 0 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 0 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 0 ms 364 KB Output is correct
32 Correct 0 ms 364 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 620 KB Output is correct
2 Correct 1 ms 620 KB Output is correct
3 Correct 1 ms 620 KB Output is correct
4 Correct 1 ms 620 KB Output is correct
5 Correct 1 ms 620 KB Output is correct
6 Correct 1 ms 620 KB Output is correct
7 Correct 1 ms 620 KB Output is correct
8 Correct 1 ms 620 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 492 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2472 KB Output is correct
2 Correct 2 ms 2472 KB Output is correct
3 Correct 3 ms 2472 KB Output is correct
4 Correct 2 ms 2472 KB Output is correct
5 Correct 2 ms 2472 KB Output is correct
6 Correct 2 ms 2472 KB Output is correct
7 Correct 2 ms 2472 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 2 ms 1420 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 16104 KB Output is correct
2 Correct 19 ms 16104 KB Output is correct
3 Correct 19 ms 16104 KB Output is correct
4 Correct 21 ms 16232 KB Output is correct
5 Correct 19 ms 16104 KB Output is correct
6 Correct 17 ms 16104 KB Output is correct
7 Correct 18 ms 16104 KB Output is correct
8 Correct 4 ms 876 KB Output is correct
9 Correct 9 ms 4688 KB Output is correct
10 Correct 18 ms 16104 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 63268 KB Output is correct
2 Correct 68 ms 63560 KB Output is correct
3 Correct 66 ms 63580 KB Output is correct
4 Correct 75 ms 63680 KB Output is correct
5 Correct 65 ms 63532 KB Output is correct
6 Correct 64 ms 63532 KB Output is correct
7 Correct 45 ms 32488 KB Output is correct
8 Correct 9 ms 2164 KB Output is correct
9 Correct 9 ms 2164 KB Output is correct
10 Correct 45 ms 32488 KB Output is correct
11 Correct 65 ms 63560 KB Output is correct
12 Correct 13 ms 5464 KB Output is correct