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Submission #1112785

# Submission time Handle Problem Language Result Execution time Memory
1112785 2024-11-14T20:14:24 Z groshi Palindromes (APIO14_palindrome) C++17
100 / 100
 700 ms 72336 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;
int maxx=1e9;
int pierw[2]={2137,601};
int mod[2]={maxx+7,maxx+9};
int potegi[400000][2];
int hasze[400000][2];
int dl[400000];
bool odw[400000];
int licze[400000];
int essa[800000];
int ktory=1;
map<pair<int,int>,int> mapka;
vector<int> Q[400000];
pair<int,int> licz(int x,int y)
{
    int hasz1=(hasze[y][0]-hasze[x-1][0]*potegi[y-x+1][0]+mod[0]*mod[0])%mod[0];
    int hasz2=(hasze[y][1]-hasze[x-1][1]*potegi[y-x+1][1]+mod[1]*mod[1])%mod[1];
    return {hasz1,hasz2};
}
int szukaj(pair<int,int> hasze,int x,int y)
{
    if(mapka.find(hasze)!=mapka.end())
        return mapka[hasze];
    mapka[hasze]=ktory;
    dl[ktory]=y-x+1;
    ktory++;
    return ktory-1;
}
int dfs(int x)
{
    if(odw[x])
        return licze[x];
    odw[x]=1;
    for(int i=0;i<Q[x].size();i++)
        licze[x]+=dfs(Q[x][i]);
    return licze[x];
}
void reku(int x,int y)
{
    pair<int,int> hasz=licz(x,y);
    int ktory=szukaj(hasz,x,y);
    if(odw[ktory] || x+1>y-1)
        return;
    odw[ktory]=1;
    pair<int,int> hasz2=licz(x+1,y-1);
    int ktory2=szukaj(hasz2,x+1,y-1);
    Q[ktory2].push_back(ktory);
    reku(x+1,y-1);
}
int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string s;
    cin>>s;
    potegi[0][0]=1;
    potegi[0][1]=1;
    for(int i=1;i<=s.length();i++)
        for(int j=0;j<2;j++)
            potegi[i][j]=(potegi[i-1][j]*pierw[j])%mod[j];
    for(int i=0;i<s.length();i++)
        for(int j=0;j<2;j++)
        {
            if(i!=0)
                hasze[i][j]=(hasze[i-1][j]*pierw[j]+(s[i]-'a'+1))%mod[j];
            else hasze[i][j]=(s[i]-'a'+1);
        }
    vector<char> pomoc;
    pomoc.push_back(s[0]);
    for(int i=1;i<s.length();i++)
        pomoc.push_back('.'),pomoc.push_back(s[i]);
    int n=s.length();
    int r=-1;
    int k=-1;
    for(int i=0;i<2*n-1;i++)
    {
        if(i<=r)
            essa[i]=min(essa[2*k-i],r-i);
        while(i-essa[i]-1>=0 && i+essa[i]+1<2*n-1 && pomoc[i-essa[i]-1]==pomoc[i+essa[i]+1])
            essa[i]++;
        if(r<i+essa[i])
            r=i+essa[i],k=i;
        int dl,x,y;
        if(i%2==1)
        {
            dl=(essa[i]+1)/2;
            x=i/2-dl+1;
            y=i/2+dl;
        }
        else{
            dl=essa[i]/2;
            x=i/2-dl;
            y=i/2+dl;
        }
        if(x>y)
            continue;
        pair<int,int> hasz=licz(x,y);
        licze[szukaj(hasz,x,y)]++;
        reku(x,y);
    }
    for(int i=0;i<=ktory;i++)
        odw[i]=0;
    int wynik=0;
    for(int i=1;i<ktory;i++)
        wynik=max(wynik,dl[i]*dfs(i));
    cout<<wynik;
    return 0;
}

Compilation message

palindrome.cpp: In function 'long long int dfs(long long int)':
palindrome.cpp:36:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(int i=0;i<Q[x].size();i++)
      |                 ~^~~~~~~~~~~~
palindrome.cpp: In function 'int32_t main()':
palindrome.cpp:61:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     for(int i=1;i<=s.length();i++)
      |                 ~^~~~~~~~~~~~
palindrome.cpp:64:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i=0;i<s.length();i++)
      |                 ~^~~~~~~~~~~
palindrome.cpp:73:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |     for(int i=1;i<s.length();i++)
      |                 ~^~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 19088 KB Output is correct
2 Correct 3 ms 19024 KB Output is correct
3 Correct 4 ms 19024 KB Output is correct
4 Correct 4 ms 19024 KB Output is correct
5 Correct 4 ms 19024 KB Output is correct
6 Correct 4 ms 19024 KB Output is correct
7 Correct 3 ms 19024 KB Output is correct
8 Correct 4 ms 19024 KB Output is correct
9 Correct 4 ms 19024 KB Output is correct
10 Correct 3 ms 19024 KB Output is correct
11 Correct 3 ms 19024 KB Output is correct
12 Correct 3 ms 19024 KB Output is correct
13 Correct 4 ms 19024 KB Output is correct
14 Correct 3 ms 19264 KB Output is correct
15 Correct 4 ms 19024 KB Output is correct
16 Correct 3 ms 19024 KB Output is correct
17 Correct 3 ms 19024 KB Output is correct
18 Correct 3 ms 19196 KB Output is correct
19 Correct 3 ms 19192 KB Output is correct
20 Correct 3 ms 19096 KB Output is correct
21 Correct 4 ms 19192 KB Output is correct
22 Correct 3 ms 19092 KB Output is correct
23 Correct 3 ms 19024 KB Output is correct
24 Correct 3 ms 19024 KB Output is correct
25 Correct 3 ms 19024 KB Output is correct
26 Correct 3 ms 19024 KB Output is correct
27 Correct 3 ms 19024 KB Output is correct
28 Correct 3 ms 19024 KB Output is correct
29 Correct 3 ms 19024 KB Output is correct
30 Correct 3 ms 19024 KB Output is correct
31 Correct 3 ms 19024 KB Output is correct
32 Correct 3 ms 19024 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 19024 KB Output is correct
2 Correct 4 ms 19024 KB Output is correct
3 Correct 4 ms 19088 KB Output is correct
4 Correct 4 ms 19024 KB Output is correct
5 Correct 4 ms 19024 KB Output is correct
6 Correct 5 ms 19184 KB Output is correct
7 Correct 4 ms 19024 KB Output is correct
8 Correct 4 ms 19156 KB Output is correct
9 Correct 3 ms 19092 KB Output is correct
10 Correct 3 ms 19024 KB Output is correct
11 Correct 3 ms 19024 KB Output is correct
12 Correct 3 ms 19120 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 18256 KB Output is correct
2 Correct 11 ms 20096 KB Output is correct
3 Correct 16 ms 18256 KB Output is correct
4 Correct 16 ms 20304 KB Output is correct
5 Correct 10 ms 20216 KB Output is correct
6 Correct 11 ms 20216 KB Output is correct
7 Correct 12 ms 20048 KB Output is correct
8 Correct 5 ms 19024 KB Output is correct
9 Correct 4 ms 19024 KB Output is correct
10 Correct 9 ms 19792 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 38152 KB Output is correct
2 Correct 127 ms 36616 KB Output is correct
3 Correct 163 ms 37948 KB Output is correct
4 Correct 192 ms 36884 KB Output is correct
5 Correct 86 ms 36616 KB Output is correct
6 Correct 72 ms 33024 KB Output is correct
7 Correct 116 ms 34116 KB Output is correct
8 Correct 17 ms 24336 KB Output is correct
9 Correct 43 ms 26960 KB Output is correct
10 Correct 81 ms 35604 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 497 ms 72256 KB Output is correct
2 Correct 483 ms 65864 KB Output is correct
3 Correct 700 ms 72336 KB Output is correct
4 Correct 636 ms 66248 KB Output is correct
5 Correct 394 ms 67016 KB Output is correct
6 Correct 404 ms 59336 KB Output is correct
7 Correct 383 ms 57100 KB Output is correct
8 Correct 40 ms 28360 KB Output is correct
9 Correct 46 ms 30504 KB Output is correct
10 Correct 315 ms 66112 KB Output is correct
11 Correct 421 ms 72228 KB Output is correct
12 Correct 78 ms 35880 KB Output is correct