oj.uz

Submission #615467

# Submission time Handle Problem Language Result Execution time Memory
615467 2022-07-31T09:36:28 Z abc864197532 Palindromes (APIO14_palindrome) C++17
100 / 100
 30 ms 35768 KB 
#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define X first
#define Y second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T a, U ...b) {
    cout << a << ' ', abc(b...);
}
template <typename T> void printv(T l, T r) {
    for (; l != r; ++l) cout << *l << " \n"[l + 1 == r];
}
template <typename A, typename B> istream& operator >> (istream& o, pair<A, B> &a) {
    return o >> a.X >> a.Y;
}
template <typename A, typename B> ostream& operator << (ostream& o, pair<A, B> a) {
    return o << '(' << a.X << ", " << a.Y << ')';
}
template <typename T> ostream& operator << (ostream& o, vector<T> a) {
    bool is = false;
    if (a.empty()) return o << "{}";
    for (T i : a) {o << (is ? ' ' : '{'), is = true, o << i;}
    return o << '}';
}
template <typename T> struct vv : vector <vector <T>> {
    vv (int n, int m, T v) : vector <vector <T>> (n, vector <T>(m, v)) {}
    vv (int n, int m) : vector <vector <T>> (n, vector <T>(m)) {}
    vv () {}
};
template <typename T> struct vvv : vector <vv <T>> {
    vvv (int n, int m, int k, T v) : vector <vv <T>> (n, vv <T>(m, k, v)) {}
    vvv (int n, int m, int k) : vector <vv <T>> (n, vv <T>(m, k)) {}
    vvv () {}
};
#ifdef Doludu
#define test(args...) abc("[" + string(#args) + "]", args)
#define owo freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#else
#define test(args...) void(0)
#define owo ios::sync_with_stdio(false); cin.tie(0)
#endif
const int mod = 998244353, N = 300005, logN = 18, G = 3;

struct PAM {
    int ch[N][26], cnt[N], fail[N], len[N], sz;
    string s;
    // 0 -> even root, 1 -> odd root
    PAM (string _s) : s(_s) {
        sz = 0;
        extend(), extend();
        len[0] = 0, fail[0] = 1, len[1] = -1;
        int lst = 1;
        for (int i = 0; i < s.length(); ++i) {
            while (s[i - len[lst] - 1] != s[i])
                lst = fail[lst];
            if (!ch[lst][s[i] - 'a'])  {
                int idx = extend();
                len[idx] = len[lst] + 2;
                int now = fail[lst];
                while (s[i - len[now] - 1] != s[i])
                    now = fail[now];
                fail[idx] = ch[now][s[i] - 'a'];
                ch[lst][s[i] - 'a'] = idx;
            }
            lst = ch[lst][s[i] - 'a'], cnt[lst]++;
        }
    }
    int extend() {
        fill(ch[sz], ch[sz] + 26, 0), sz++;
        return sz - 1;
    }
    lli solve() {
        for (int i = sz - 1; i > 1; --i) {
            cnt[fail[i]] += cnt[i];
        }
        lli ans = 0;
        for (int i = 2; i < sz; ++i) {
            ans = max(ans, 1ll * len[i] * cnt[i]);
        }
        return ans;
    }
};

int main () {
    owo;
    string s;
    cin >> s;
    PAM solver(s);
    cout << solver.solve() << '\n';
}

Compilation message

palindrome.cpp: In constructor 'PAM::PAM(std::string)':
palindrome.cpp:59:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |         for (int i = 0; i < s.length(); ++i) {
      |                         ~~^~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 34260 KB Output is correct
2 Correct 15 ms 34260 KB Output is correct
3 Correct 16 ms 34236 KB Output is correct
4 Correct 17 ms 34252 KB Output is correct
5 Correct 16 ms 34260 KB Output is correct
6 Correct 15 ms 34260 KB Output is correct
7 Correct 15 ms 34260 KB Output is correct
8 Correct 15 ms 34260 KB Output is correct
9 Correct 15 ms 34328 KB Output is correct
10 Correct 16 ms 34340 KB Output is correct
11 Correct 15 ms 34300 KB Output is correct
12 Correct 15 ms 34316 KB Output is correct
13 Correct 14 ms 34312 KB Output is correct
14 Correct 16 ms 34416 KB Output is correct
15 Correct 15 ms 34244 KB Output is correct
16 Correct 15 ms 34260 KB Output is correct
17 Correct 18 ms 34308 KB Output is correct
18 Correct 14 ms 34272 KB Output is correct
19 Correct 17 ms 34328 KB Output is correct
20 Correct 16 ms 34336 KB Output is correct
21 Correct 14 ms 34260 KB Output is correct
22 Correct 14 ms 34260 KB Output is correct
23 Correct 15 ms 34376 KB Output is correct
24 Correct 14 ms 34260 KB Output is correct
25 Correct 17 ms 34332 KB Output is correct
26 Correct 14 ms 34260 KB Output is correct
27 Correct 16 ms 34340 KB Output is correct
28 Correct 15 ms 34260 KB Output is correct
29 Correct 15 ms 34268 KB Output is correct
30 Correct 15 ms 34312 KB Output is correct
31 Correct 13 ms 34316 KB Output is correct
32 Correct 16 ms 34260 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 34260 KB Output is correct
2 Correct 14 ms 34260 KB Output is correct
3 Correct 17 ms 34264 KB Output is correct
4 Correct 18 ms 34260 KB Output is correct
5 Correct 17 ms 34360 KB Output is correct
6 Correct 16 ms 34304 KB Output is correct
7 Correct 15 ms 34332 KB Output is correct
8 Correct 16 ms 34332 KB Output is correct
9 Correct 15 ms 34260 KB Output is correct
10 Correct 14 ms 34260 KB Output is correct
11 Correct 18 ms 34352 KB Output is correct
12 Correct 15 ms 34260 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 34352 KB Output is correct
2 Correct 17 ms 34388 KB Output is correct
3 Correct 17 ms 34388 KB Output is correct
4 Correct 17 ms 34292 KB Output is correct
5 Correct 18 ms 34392 KB Output is correct
6 Correct 18 ms 34360 KB Output is correct
7 Correct 16 ms 34300 KB Output is correct
8 Correct 15 ms 34388 KB Output is correct
9 Correct 15 ms 34376 KB Output is correct
10 Correct 15 ms 34388 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 34608 KB Output is correct
2 Correct 20 ms 34596 KB Output is correct
3 Correct 19 ms 34580 KB Output is correct
4 Correct 22 ms 34592 KB Output is correct
5 Correct 19 ms 34588 KB Output is correct
6 Correct 19 ms 34624 KB Output is correct
7 Correct 19 ms 34592 KB Output is correct
8 Correct 16 ms 34564 KB Output is correct
9 Correct 19 ms 34644 KB Output is correct
10 Correct 18 ms 34640 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 35292 KB Output is correct
2 Correct 27 ms 35572 KB Output is correct
3 Correct 27 ms 35672 KB Output is correct
4 Correct 28 ms 35664 KB Output is correct
5 Correct 30 ms 35652 KB Output is correct
6 Correct 29 ms 35668 KB Output is correct
7 Correct 29 ms 35652 KB Output is correct
8 Correct 20 ms 35652 KB Output is correct
9 Correct 19 ms 35768 KB Output is correct
10 Correct 26 ms 35564 KB Output is correct
11 Correct 27 ms 35676 KB Output is correct
12 Correct 20 ms 35676 KB Output is correct