Submission #226680

#	Time	Username	Problem	Language	Result	Execution time	Memory
226680		keta_tsimakuridze	Palindromic Partitions (CEOI17_palindromic)	C++14	100 / 100	551 ms	19044 KiB

palindromic

#include<bits/stdc++.h>
using namespace std;
long long mod,p,t,k,i,pwr[1000005],j,s1,s2,cur,ans;
string s;
int main(){
	cin>>t;
	p=31;
	mod=1e9+7;
	pwr[1]=1;
	for(k=2;k<=1000005;k++){
		pwr[k]=pwr[k-1]*p%mod;
	}
	while(t--){
		cin>>s;
		j=s.size()-1;
        cur=1;
		for(i=0;i<(s.size())/2;i++){
			s1+=pwr[cur]*((int)s[i]-'a'+1);
			s1%=mod;
			s2=s2*p%mod+((int)s[j]-'a'+1);
			s2%=mod;  
			if(s1==s2){
				cur=1; s1=s2=0; 
				ans+=2; 
			}else cur++;
			j--;
		} s2=s1=0;
		if(cur!=1 || s.size()%2==1) cout<<ans+1<<endl;
		else cout<<ans<<endl;
		ans=0;
	}
}

Compilation message (stderr)

palindromic.cpp: In function 'int main()':
palindromic.cpp:17:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<(s.size())/2;i++){
           ~^~~~~~~~~~~~~

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