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Submission #253632

# Submission time Handle Problem Language Result Execution time Memory
253632 2020-07-28T13:20:43 Z dolphingarlic Palindromes (APIO14_palindrome) C++14
100 / 100
 69 ms 69628 KB 
#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;

struct Node {
    int nxt[26], sufflink;
    ll len, cnt;
    vector<int> edges;
} tree[303030];

string s;
int suff, num;
ll ans = 0;

void add_letter(int pos) {
    int curr = suff, curr_len = 0;
    int letter = s[pos] - 'a';

    while (true) {
        curr_len = tree[curr].len;
        if (pos - 1 - curr_len > -1 && s[pos - 1 - curr_len] == s[pos])
            break;
        curr = tree[curr].sufflink;
    }
    if (tree[curr].nxt[letter]) {
        suff = tree[curr].nxt[letter];
        tree[suff].cnt++;
        return;
    }
    
    suff = ++num;
    tree[num].len = tree[curr].len + 2;
    tree[num].cnt = 1;
    tree[curr].nxt[letter] = num;

    if (tree[num].len == 1) {
        tree[num].sufflink = 2;
        tree[2].edges.push_back(num);
        return;
    }

    while (true) {
        curr = tree[curr].sufflink;
        curr_len = tree[curr].len;
        if (pos - 1 - curr_len > -1 && s[pos - 1 - curr_len] == s[pos]) {
            tree[num].sufflink = tree[curr].nxt[letter];
            tree[tree[curr].nxt[letter]].edges.push_back(num);
            break;
        }
    }
}

void init() {
    num = 2, suff = 2;
    tree[1].len = -1, tree[1].sufflink = 1;
    tree[2].len = 0, tree[2].sufflink = 1;
    tree[1].edges.push_back(2);
}

void dfs(int node = 1) {
    for (int i : tree[node].edges) {
        dfs(i);
        tree[node].cnt += tree[i].cnt;
    }
    ans = max(ans, tree[node].len * tree[node].cnt);
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> s;
    init();
    FOR(i, 0, s.size()) add_letter(i);
    dfs();
    cout << ans;
    return 0;
}

Compilation message

palindrome.cpp: In function 'int main()':
palindrome.cpp:2:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define FOR(i, x, y) for (int i = x; i < y; i++)
palindrome.cpp:74:9:
     FOR(i, 0, s.size()) add_letter(i);
         ~~~~~~~~~~~~~~                  
palindrome.cpp:74:5: note: in expansion of macro 'FOR'
     FOR(i, 0, s.size()) add_letter(i);
     ^~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 45440 KB Output is correct
2 Correct 21 ms 45440 KB Output is correct
3 Correct 21 ms 45440 KB Output is correct
4 Correct 21 ms 45440 KB Output is correct
5 Correct 21 ms 45440 KB Output is correct
6 Correct 21 ms 45440 KB Output is correct
7 Correct 22 ms 45440 KB Output is correct
8 Correct 26 ms 45440 KB Output is correct
9 Correct 21 ms 45440 KB Output is correct
10 Correct 21 ms 45440 KB Output is correct
11 Correct 21 ms 45440 KB Output is correct
12 Correct 21 ms 45564 KB Output is correct
13 Correct 21 ms 45432 KB Output is correct
14 Correct 29 ms 45440 KB Output is correct
15 Correct 27 ms 45440 KB Output is correct
16 Correct 26 ms 45440 KB Output is correct
17 Correct 26 ms 45432 KB Output is correct
18 Correct 25 ms 45432 KB Output is correct
19 Correct 25 ms 45440 KB Output is correct
20 Correct 22 ms 45440 KB Output is correct
21 Correct 22 ms 45560 KB Output is correct
22 Correct 21 ms 45440 KB Output is correct
23 Correct 21 ms 45440 KB Output is correct
24 Correct 22 ms 45440 KB Output is correct
25 Correct 24 ms 45344 KB Output is correct
26 Correct 26 ms 45448 KB Output is correct
27 Correct 21 ms 45440 KB Output is correct
28 Correct 22 ms 45440 KB Output is correct
29 Correct 23 ms 45440 KB Output is correct
30 Correct 21 ms 45440 KB Output is correct
31 Correct 22 ms 45440 KB Output is correct
32 Correct 22 ms 45440 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 45440 KB Output is correct
2 Correct 29 ms 45440 KB Output is correct
3 Correct 26 ms 45440 KB Output is correct
4 Correct 22 ms 45440 KB Output is correct
5 Correct 28 ms 45440 KB Output is correct
6 Correct 25 ms 45440 KB Output is correct
7 Correct 22 ms 45440 KB Output is correct
8 Correct 25 ms 45440 KB Output is correct
9 Correct 21 ms 45440 KB Output is correct
10 Correct 21 ms 45440 KB Output is correct
11 Correct 25 ms 45440 KB Output is correct
12 Correct 22 ms 45440 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 45952 KB Output is correct
2 Correct 22 ms 45948 KB Output is correct
3 Correct 22 ms 46200 KB Output is correct
4 Correct 24 ms 46080 KB Output is correct
5 Correct 22 ms 45568 KB Output is correct
6 Correct 23 ms 45696 KB Output is correct
7 Correct 22 ms 45824 KB Output is correct
8 Correct 23 ms 45432 KB Output is correct
9 Correct 25 ms 45440 KB Output is correct
10 Correct 22 ms 45440 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 51064 KB Output is correct
2 Correct 31 ms 50048 KB Output is correct
3 Correct 35 ms 53372 KB Output is correct
4 Correct 33 ms 51704 KB Output is correct
5 Correct 35 ms 46720 KB Output is correct
6 Correct 31 ms 47608 KB Output is correct
7 Correct 29 ms 48640 KB Output is correct
8 Correct 24 ms 45688 KB Output is correct
9 Correct 25 ms 47352 KB Output is correct
10 Correct 31 ms 46592 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 62460 KB Output is correct
2 Correct 53 ms 57344 KB Output is correct
3 Correct 58 ms 69628 KB Output is correct
4 Correct 54 ms 60548 KB Output is correct
5 Correct 69 ms 50432 KB Output is correct
6 Correct 58 ms 56192 KB Output is correct
7 Correct 50 ms 54528 KB Output is correct
8 Correct 28 ms 46336 KB Output is correct
9 Correct 28 ms 46472 KB Output is correct
10 Correct 57 ms 49536 KB Output is correct
11 Correct 57 ms 57784 KB Output is correct
12 Correct 30 ms 48128 KB Output is correct