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Submission #237091

# Submission time Handle Problem Language Result Execution time Memory
237091 2020-06-04T14:03:49 Z nvmdava Palindromes (APIO14_palindrome) C++17
100 / 100
 272 ms 122496 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define N 300005
const ll MOD = 1000000007;
const int INF = 0x3f3f3f3f;


ll mx = 1;
struct Node{
    Node *c[26], *p[19];
    int sz = 0, de;
    int trav(){
        for(int i = 0; i < 26; ++i){
            if(!c[i])
                continue;
            sz += c[i] -> trav();
            delete(c[i]);
            c[i] = NULL;
        }
        mx = max(mx, 1LL * de * sz);
        return sz;
    }
    Node* go(int a){
        if(c[a])
            return c[a];
        c[a] = new Node();
        c[a] -> de = de + 2;
        c[a] -> p[0] = this;
        for(int i = 1; ; ++i){
            c[a] -> p[i] = c[a] -> p[i - 1] -> p[i - 1];
            if(!c[a] -> p[i]) break;
        }
        return c[a];
    }
} *r1 = new Node();

int d1[N];
Node *w1[N];
int a[N];

int lg[N];

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

    string s;
    cin>>s;

    for(int i = 2; i < N; i <<= 1)
        lg[i] = lg[i >> 1] + 1;

    r1 -> de = -1;

    int n = s.size();
    for(int i = 0; i < n; ++i)
        a[i] = s[i] - 'a';
    
    int lo = -1, r = -1;
    for(int i = 0; i < n; ++i){
        if(r < i){
            d1[i] = 1;
            w1[i] = r1 -> go(a[i]);
        } else {
            w1[i] = w1[lo - (i - lo)];
            d1[i] = d1[lo - (i - lo)];
            int w = max(0, d1[i] - (r - i));
            d1[i] -= w;
            while(w){
                w1[i] = w1[i] -> p[lg[w & -w]];
                w -= w & -w;
            }
        }

        while(i + d1[i] < n && i - d1[i] >= 0 && a[i - d1[i]] == a[i + d1[i]]){
            w1[i] = w1[i] -> go(a[i + d1[i]]);
            ++d1[i];
        }


        ++w1[i] -> sz;
        if(r <= i + d1[i] - 1){
            r = i + d1[i] - 1;
            lo = i;
        }
    }
    r1 -> trav();

    r1 -> de = 0;
    lo = -1, r = -1;
    for(int i = 0; i < n; ++i){
        if(r < i){
            d1[i] = 0;
            w1[i] = r1;
        } else {
            w1[i] = w1[lo - (i - lo)];
            d1[i] = d1[lo - (i - lo)];
            int w = max(0, d1[i] - (r - i));
            d1[i] -= w;
            while(w){
                w1[i] = w1[i] -> p[lg[w & -w]];
                w -= w & -w;
            }
        }

        while(i + d1[i] < n && i - d1[i] - 1 >= 0 && a[i - d1[i] - 1] == a[i + d1[i]]){
            w1[i] = w1[i] -> go(a[i + d1[i]]);
            ++d1[i];
        }
        ++w1[i] -> sz;
        if(r <= i + d1[i] - 1){
            r = i + d1[i] - 1;
            lo = i;
        }
    }
    r1 -> trav();

    cout<<mx;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 4 ms 384 KB Output is correct
22 Correct 4 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 5 ms 384 KB Output is correct
26 Correct 5 ms 384 KB Output is correct
27 Correct 4 ms 384 KB Output is correct
28 Correct 5 ms 512 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 384 KB Output is correct
31 Correct 4 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 768 KB Output is correct
2 Correct 5 ms 768 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 5 ms 768 KB Output is correct
5 Correct 5 ms 640 KB Output is correct
6 Correct 5 ms 640 KB Output is correct
7 Correct 5 ms 768 KB Output is correct
8 Correct 5 ms 768 KB Output is correct
9 Correct 5 ms 640 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 5 ms 512 KB Output is correct
12 Correct 5 ms 768 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 4480 KB Output is correct
2 Correct 10 ms 4352 KB Output is correct
3 Correct 12 ms 2612 KB Output is correct
4 Correct 9 ms 2612 KB Output is correct
5 Correct 9 ms 4352 KB Output is correct
6 Correct 9 ms 4096 KB Output is correct
7 Correct 9 ms 4352 KB Output is correct
8 Correct 5 ms 768 KB Output is correct
9 Correct 5 ms 768 KB Output is correct
10 Correct 8 ms 3200 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 96 ms 40952 KB Output is correct
2 Correct 89 ms 40184 KB Output is correct
3 Correct 71 ms 22172 KB Output is correct
4 Correct 63 ms 21676 KB Output is correct
5 Correct 55 ms 40568 KB Output is correct
6 Correct 46 ms 29824 KB Output is correct
7 Correct 45 ms 25856 KB Output is correct
8 Correct 7 ms 2432 KB Output is correct
9 Correct 18 ms 6912 KB Output is correct
10 Correct 55 ms 34556 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 272 ms 122496 KB Output is correct
2 Correct 218 ms 119424 KB Output is correct
3 Correct 186 ms 65924 KB Output is correct
4 Correct 146 ms 63592 KB Output is correct
5 Correct 162 ms 121804 KB Output is correct
6 Correct 150 ms 91132 KB Output is correct
7 Correct 124 ms 76544 KB Output is correct
8 Correct 12 ms 6152 KB Output is correct
9 Correct 11 ms 6152 KB Output is correct
10 Correct 150 ms 101452 KB Output is correct
11 Correct 251 ms 122356 KB Output is correct
12 Correct 23 ms 11528 KB Output is correct