Submission #670320

#	Time	Username	Problem	Language	Result	Execution time	Memory
670320		Mohammad_Parsa	Palindromic Partitions (CEOI17_palindromic)	C++17	60 / 100	10016 ms	2992 KiB

palindromic

/* in the name of allah */
#include<bits/stdc++.h>
using namespace std;

#define endl '\n'
#define pb push_back
#define F first
#define S second
#define mk make_pair
typedef long long ll;

const ll N=1e6+7,mod=1e13+3,mab=27;
int dp[N];

int main(){
	ios:: sync_with_stdio(0),cin.tie(0),cout.tie(0);
	int q;
	cin>>q;
	while(q--){
		string s;
		cin>>s;
		int k=s.size()/2-1,j=k+1;
		if(s.size()%2==0){
			dp[0]=0;
		}
		else{
			dp[0]=1;j++;
		}

		for(int i=1;i<=s.size()/2;i++){
			ll h1=0,h2=0,t=1;
			dp[i]=1;
			for(int h=0;h<=s.size()/2-1-k;h++){
				h1=h1*mab%mod;h1=(h1+s[k+h]-'a')%mod;
				h2=(h2+(s[j-h]-'a')*t)%mod;t=t*mab%mod;
				if(h1==h2){
					dp[i]=max(dp[i],dp[i-h-1]+2);
				}
			}
			k--;j++;
		}
		cout<<dp[s.size()/2]<<endl;
	}
}

Compilation message (stderr)

palindromic.cpp: In function 'int main()':
palindromic.cpp:30:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |   for(int i=1;i<=s.size()/2;i++){
      |               ~^~~~~~~~~~~~
palindromic.cpp:33:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |    for(int h=0;h<=s.size()/2-1-k;h++){
      |                ~^~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 0 / 40