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답안 #112437

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
112437 2019-05-19T19:14:52 Z Akashi 회문 (APIO14_palindrome) C++14
100 / 100
 111 ms 66732 KB 
#include <bits/stdc++.h>
using namespace std;


struct Node{
    vector <int> v;
    int son[26];
    int num, length, link;
};

Node PalTree[300005];
char s[300005];


void initialize_tree(){
    PalTree[1].length = -1; PalTree[1].link = 1;
    PalTree[2].length = 0; PalTree[2].link = 1;
}

int Last = 2, tree_size = 2;
void add_letter(int pos){
    char ch = s[pos] - 'a';

    while(true){
        if(pos - PalTree[Last].length - 1 >= 0 && s[pos] == s[pos - PalTree[Last].length - 1]) break ;
        Last = PalTree[Last].link;
    }

    if(PalTree[Last].son[ch]){
        PalTree[PalTree[Last].son[ch]].num++;
        Last = PalTree[Last].son[ch];
        return ;
    }

    int cur = ++tree_size;
    PalTree[Last].son[ch] = cur;
    PalTree[cur].length = PalTree[Last].length + 2;
    PalTree[cur].num = 1;

    if(Last == 1){
        PalTree[2].v.push_back(cur);
        PalTree[cur].link = 2;
        Last = cur;
        return ;
    }

    while(true){
        Last = PalTree[Last].link;
        if(pos - PalTree[Last].length - 1 >= 0 && s[pos] == s[pos - PalTree[Last].length - 1]){
            PalTree[cur].link = PalTree[Last].son[ch];
            PalTree[PalTree[cur].link].v.push_back(cur);
            break ;
        }
    }
    Last = cur;
}

long long Sol = 0;
void dfs(int nod = 2){
    for(auto it : PalTree[nod].v){
        dfs(it);
        PalTree[nod].num += PalTree[it].num;
    }
    Sol = max(Sol, 1LL * PalTree[nod].length * PalTree[nod].num);
}

int main()
{
//    freopen("palindrome.in", "r", stdin);
//    freopen("palindrome.out", "w", stdout);

    initialize_tree();

    scanf("%s", s);
    int L = strlen(s);
    for(int i = 0; i < L ; ++i) add_letter(i);

    dfs();

    printf("%lld", Sol);

    return 0;
}

Compilation message

palindrome.cpp: In function 'void add_letter(int)':
palindrome.cpp:29:28: warning: array subscript has type 'char' [-Wchar-subscripts]
     if(PalTree[Last].son[ch]){
                            ^
palindrome.cpp:30:37: warning: array subscript has type 'char' [-Wchar-subscripts]
         PalTree[PalTree[Last].son[ch]].num++;
                                     ^
palindrome.cpp:31:36: warning: array subscript has type 'char' [-Wchar-subscripts]
         Last = PalTree[Last].son[ch];
                                    ^
palindrome.cpp:36:25: warning: array subscript has type 'char' [-Wchar-subscripts]
     PalTree[Last].son[ch] = cur;
                         ^
palindrome.cpp:50:53: warning: array subscript has type 'char' [-Wchar-subscripts]
             PalTree[cur].link = PalTree[Last].son[ch];
                                                     ^
palindrome.cpp: In function 'int main()':
palindrome.cpp:74:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", s);
     ~~~~~^~~~~~~~~

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 42616 KB Output is correct
2 Correct 32 ms 42624 KB Output is correct
3 Correct 32 ms 42624 KB Output is correct
4 Correct 34 ms 42616 KB Output is correct
5 Correct 32 ms 42512 KB Output is correct
6 Correct 32 ms 42504 KB Output is correct
7 Correct 32 ms 42616 KB Output is correct
8 Correct 31 ms 42616 KB Output is correct
9 Correct 32 ms 42624 KB Output is correct
10 Correct 32 ms 42616 KB Output is correct
11 Correct 33 ms 42624 KB Output is correct
12 Correct 33 ms 42624 KB Output is correct
13 Correct 33 ms 42616 KB Output is correct
14 Correct 32 ms 42576 KB Output is correct
15 Correct 32 ms 42624 KB Output is correct
16 Correct 32 ms 42616 KB Output is correct
17 Correct 31 ms 42624 KB Output is correct
18 Correct 32 ms 42624 KB Output is correct
19 Correct 32 ms 42616 KB Output is correct
20 Correct 33 ms 42624 KB Output is correct
21 Correct 32 ms 42744 KB Output is correct
22 Correct 32 ms 42744 KB Output is correct
23 Correct 33 ms 42624 KB Output is correct
24 Correct 32 ms 42624 KB Output is correct
25 Correct 32 ms 42748 KB Output is correct
26 Correct 32 ms 42616 KB Output is correct
27 Correct 32 ms 42624 KB Output is correct
28 Correct 33 ms 42616 KB Output is correct
29 Correct 32 ms 42608 KB Output is correct
30 Correct 33 ms 42612 KB Output is correct
31 Correct 31 ms 42616 KB Output is correct
32 Correct 33 ms 42656 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 42624 KB Output is correct
2 Correct 32 ms 42624 KB Output is correct
3 Correct 32 ms 42740 KB Output is correct
4 Correct 34 ms 42596 KB Output is correct
5 Correct 32 ms 42616 KB Output is correct
6 Correct 33 ms 42752 KB Output is correct
7 Correct 33 ms 42616 KB Output is correct
8 Correct 33 ms 42616 KB Output is correct
9 Correct 32 ms 42624 KB Output is correct
10 Correct 32 ms 42624 KB Output is correct
11 Correct 32 ms 42616 KB Output is correct
12 Correct 34 ms 42616 KB Output is correct

Subtask #3
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 43100 KB Output is correct
2 Correct 34 ms 43112 KB Output is correct
3 Correct 36 ms 43392 KB Output is correct
4 Correct 34 ms 43392 KB Output is correct
5 Correct 33 ms 42744 KB Output is correct
6 Correct 35 ms 42880 KB Output is correct
7 Correct 35 ms 43008 KB Output is correct
8 Correct 33 ms 42624 KB Output is correct
9 Correct 35 ms 42624 KB Output is correct
10 Correct 34 ms 42744 KB Output is correct

Subtask #4
26.0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 54 ms 48376 KB Output is correct
2 Correct 53 ms 47224 KB Output is correct
3 Correct 54 ms 50680 KB Output is correct
4 Correct 56 ms 49072 KB Output is correct
5 Correct 47 ms 44024 KB Output is correct
6 Correct 44 ms 44664 KB Output is correct
7 Correct 48 ms 45788 KB Output is correct
8 Correct 35 ms 42744 KB Output is correct
9 Correct 38 ms 44536 KB Output is correct
10 Correct 44 ms 43776 KB Output is correct

Subtask #5
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 96 ms 59640 KB Output is correct
2 Correct 106 ms 54520 KB Output is correct
3 Correct 106 ms 66732 KB Output is correct
4 Correct 90 ms 57700 KB Output is correct
5 Correct 97 ms 47608 KB Output is correct
6 Correct 82 ms 53240 KB Output is correct
7 Correct 95 ms 51704 KB Output is correct
8 Correct 39 ms 43256 KB Output is correct
9 Correct 38 ms 43228 KB Output is correct
10 Correct 82 ms 46844 KB Output is correct
11 Correct 111 ms 54904 KB Output is correct
12 Correct 43 ms 45304 KB Output is correct