Submission #312053

#	Time	Username	Problem	Language	Result	Execution time	Memory
312053		FatihSolak	Palinilap (COI16_palinilap)	C++14	17 / 100	1087 ms	512 KiB

palinilap

#include <bits/stdc++.h>
using namespace std;
string s;
long long solve(){
    long long tot = 0;
    for (int i = 0; i < s.length(); i++) {
        int odd = 1;
        while (i - odd >= 0 && odd + i < s.length() && s[i - odd] == s[i + odd]) {
            odd++;
        }
        int even = 0;
        int l = i - 1;
        int r = i;
        while (l >= 0 && r < s.length() && s[l] == s[r]) {
            even++;
            l--;
            r++;
        }
        tot += odd + even;
    }
    return tot;
}
int main(){
    cin >> s;
    long long maxi=0;
    int l=s.length();
    for(int i=0;i<l;i++){
        char now=s[i];
        for(int j=0;j<26;j++){
            s[i] = j+'a';
            maxi = max(maxi, solve());
        }
        s[i] = now;
    }
    cout << maxi;
    /*
    long long arr[l][26];
    long long brr[l];
    for(int i=0;i<l;i++){
        for(int j=0;j<26;j++){
            arr[i][j]=1; 
        }
        brr[i]=0;
    }
    for(int i=0;i<l;i++){
        for(int j=i;j<l;j++){
            string a="";
            for(int c=i;c<=j;c++){
                a +=s[c];
            }
            string b=a;
            reverse(a.begin(),a.end());
            if(j-i%2 == 0){
                for(int c=0;c<26;c++){
                    if(c!=s[(i+j)/2]-'a'){
                        arr[(i+j)/2][c]++;
                    }
                }
            }
            if(b == a){
                ans++;
                for(int c=i;c<=j;c++){
                    brr[c]++;
                }
            }
            else{
                for(int h=0;h<(j-i+1)/2;h++){
                    if(b[h] != a[h]){
                        string d ="";
                        for(int c=i;c<=j;c++){
                            if(c == i+h || c == j-h){
                                continue;
                            }
                            d+=s[c];
                        }
                        string e=d;
                        reverse(d.begin(),d.end());
                        if(d==e){
                            arr[i+h][a[h]-'a']++;
                            arr[j-h][b[h]-'a']++;
                            //cout << i<< " " << j << " "<<  i+h <<" " << a[h] << " " << j-h  << " " << b[h]<< endl;
                        }
                    }
                }
            }
        }
    }
    //cout <<endl;
    long long maxi=0;
    for(int i=0;i<l;i++){
        for(int j=0;j<26;j++){
            if(brr[i] <=arr[i][j]){
                maxi = max(maxi,arr[i][j]-brr[i]);
            }
            cout << arr[i][j] <<" ";
        }
        cout <<endl;
    }
    cout << maxi +ans;*/
}

Compilation message (stderr)

palinilap.cpp: In function 'long long int solve()':
palinilap.cpp:6:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |     for (int i = 0; i < s.length(); i++) {
      |                     ~~^~~~~~~~~~~~
palinilap.cpp:8:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         while (i - odd >= 0 && odd + i < s.length() && s[i - odd] == s[i + odd]) {
      |                                ~~~~~~~~^~~~~~~~~~~~
palinilap.cpp:14:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |         while (l >= 0 && r < s.length() && s[l] == s[r]) {
      |                          ~~^~~~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 0 / 37
• Subtask 3: 0 / 46