oj.uz

Submission #1040076

# Submission time Handle Problem Language Result Execution time Memory
1040076 2024-07-31T15:46:25 Z doducanh Palindromes (APIO14_palindrome) C++14
100 / 100
 48 ms 69096 KB 
///breaker
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define ii pair<int,int>
const int maxn=3e5+7;
string s;
struct Node{
    int nxt[26],sufflink;
    ll len,cnt;
    vector<int>edges;
}tree[maxn];
int suff,num;
ll ans=0;
void add(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>=0&&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>=0&&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[2].len=0;
    tree[1].sufflink=1;
    tree[2].sufflink=1;
    tree[1].edges.push_back(2);
}
int dfs(int u=1)
{
    for(int i:tree[u].edges){
        tree[u].cnt+=dfs(i);
    }
    ans=max(ans,tree[u].cnt*tree[u].len);
    return tree[u].cnt;
}
void sol(){
    cin>>s;
    init();
    for(int i=0;i<s.size();i++)add(i);
    dfs();
    cout<<ans;
}
main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int t=1;
    while(t--){
        sol();
    }
    // you should actually read the stuff at the bottom
    return 0;
}
/* stuff you should look for
 * int overflow, array bounds
 * special cases (n=1?)
 * do smth instead of nothing and stay organized
 * WRITE STUFF DOWN
 * DON'T GET STUCK ON ONE APPROACH
 */

Compilation message

palindrome.cpp: In function 'void sol()':
palindrome.cpp:68:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     for(int i=0;i<s.size();i++)add(i);
      |                 ~^~~~~~~~~
palindrome.cpp: At global scope:
palindrome.cpp:72:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   72 | main()
      | ^~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 44892 KB Output is correct
2 Correct 16 ms 44852 KB Output is correct
3 Correct 16 ms 45016 KB Output is correct
4 Correct 16 ms 44892 KB Output is correct
5 Correct 24 ms 44892 KB Output is correct
6 Correct 17 ms 44888 KB Output is correct
7 Correct 23 ms 44892 KB Output is correct
8 Correct 17 ms 44888 KB Output is correct
9 Correct 17 ms 44888 KB Output is correct
10 Correct 15 ms 44892 KB Output is correct
11 Correct 17 ms 44864 KB Output is correct
12 Correct 17 ms 44888 KB Output is correct
13 Correct 17 ms 44892 KB Output is correct
14 Correct 15 ms 44960 KB Output is correct
15 Correct 22 ms 44892 KB Output is correct
16 Correct 23 ms 44884 KB Output is correct
17 Correct 17 ms 44888 KB Output is correct
18 Correct 17 ms 44888 KB Output is correct
19 Correct 24 ms 45056 KB Output is correct
20 Correct 23 ms 44892 KB Output is correct
21 Correct 18 ms 44888 KB Output is correct
22 Correct 18 ms 44892 KB Output is correct
23 Correct 17 ms 44892 KB Output is correct
24 Correct 17 ms 44900 KB Output is correct
25 Correct 19 ms 44892 KB Output is correct
26 Correct 17 ms 44888 KB Output is correct
27 Correct 17 ms 45072 KB Output is correct
28 Correct 18 ms 44892 KB Output is correct
29 Correct 17 ms 44892 KB Output is correct
30 Correct 16 ms 45072 KB Output is correct
31 Correct 16 ms 44892 KB Output is correct
32 Correct 16 ms 44892 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 45148 KB Output is correct
2 Correct 16 ms 44892 KB Output is correct
3 Correct 16 ms 45144 KB Output is correct
4 Correct 22 ms 44892 KB Output is correct
5 Correct 18 ms 45148 KB Output is correct
6 Correct 16 ms 45144 KB Output is correct
7 Correct 17 ms 44888 KB Output is correct
8 Correct 18 ms 45144 KB Output is correct
9 Correct 17 ms 44888 KB Output is correct
10 Correct 22 ms 44880 KB Output is correct
11 Correct 22 ms 44968 KB Output is correct
12 Correct 16 ms 44892 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 45400 KB Output is correct
2 Correct 24 ms 45404 KB Output is correct
3 Correct 17 ms 45676 KB Output is correct
4 Correct 16 ms 45656 KB Output is correct
5 Correct 17 ms 45144 KB Output is correct
6 Correct 19 ms 45124 KB Output is correct
7 Correct 16 ms 45404 KB Output is correct
8 Correct 17 ms 45088 KB Output is correct
9 Correct 18 ms 44892 KB Output is correct
10 Correct 16 ms 45148 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 50520 KB Output is correct
2 Correct 23 ms 49500 KB Output is correct
3 Correct 26 ms 53072 KB Output is correct
4 Correct 24 ms 51292 KB Output is correct
5 Correct 32 ms 46216 KB Output is correct
6 Correct 22 ms 47136 KB Output is correct
7 Correct 22 ms 48220 KB Output is correct
8 Correct 24 ms 45292 KB Output is correct
9 Correct 21 ms 46972 KB Output is correct
10 Correct 28 ms 46164 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 61920 KB Output is correct
2 Correct 36 ms 57060 KB Output is correct
3 Correct 48 ms 69096 KB Output is correct
4 Correct 41 ms 59944 KB Output is correct
5 Correct 45 ms 49880 KB Output is correct
6 Correct 37 ms 55768 KB Output is correct
7 Correct 35 ms 54028 KB Output is correct
8 Correct 21 ms 45792 KB Output is correct
9 Correct 22 ms 45848 KB Output is correct
10 Correct 39 ms 49124 KB Output is correct
11 Correct 35 ms 57308 KB Output is correct
12 Correct 23 ms 47588 KB Output is correct