Submission #226677

#	Time	Username	Problem	Language	Result	Execution time	Memory
226677		keta_tsimakuridze	Palindromic Partitions (CEOI17_palindromic)	C++14	0 / 100	21 ms	16000 KiB

palindromic

#include<bits/stdc++.h>
using namespace std;
long long mod,p,t,k,i,pwr[1000005],j,s1,s2,cur,ans,p1,mod1,pwr1[1000005],S1,S2;
string s;
int main(){
	cin>>t;
	p=31;
	p1=29;
	mod=1e9+7;
	mod1=1e9+9;
	pwr[1]=1;
	pwr1[1]=1;
	for(k=2;k<=1000005;k++){
		pwr[k]=pwr[k-1]*p%mod;
		pwr1[k]=pwr1[k-1]*p1%mod1;
	} 
	while(t--){
		cin>>s;
		j=s.size()-1;
        cur=1;s2=s1=S1=S2=0;
		for(i=0;i<(s.size())/2;i++){
			s1+=pwr[cur]*((int)s[i]-'a'+1)%mod;
			S1+=pwr1[cur]*((int)s[i]-'a'+1)%mod1;
			s1%=mod;
			S1%=mod1;
			s2=s2*p%mod+((int)s[j]-'a'+1);
			S2=S2*p1%mod1+((int)s[j]-'a'+1);
			s2%=mod;  
			S2%=mod1;
			if(s1==s2 && S1==S2){
				cur=1; s1=s2=0;  
				ans+=2;  S1=S2=0;
			}else cur++;
			j--;
		} 
		if(cur!=1 || s.size()%2==1) cout<<ans+1<<endl;
		else cout<<ans;
		ans=0;
	}
}

Compilation message (stderr)

palindromic.cpp: In function 'int main()':
palindromic.cpp:21:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<(s.size())/2;i++){
           ~^~~~~~~~~~~~~

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