Submission #916695

#	Time	Username	Problem	Language	Result	Execution time	Memory
916695		m0vlan	Palindromic Partitions (CEOI17_palindromic)	C++17	60 / 100	10027 ms	4736 KiB

palindromic

#include <bits/stdc++.h>
using namespace std;

#define sync ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define ll logng long

const int m=1e9+7;

int get_hash(const string &s){
    int pw=1,hs=0;
    for(char c:s){
        hs=(hs+(1ll*(c-'a'+1)*pw))%m;
        pw=(pw*37)%m;
    }
    return hs;
}

int main(){
    sync;
    string s;
    int t;
    cin>>t;
    while(t--){
        cin>>s;
        int cnt=1,n=s.size(),l=0,r=n-1,d=n/2;
        while(r>=d && l<r){
            if(s[r]==s[l] && get_hash(s.substr(l,n-r))==get_hash(s.substr(r,n-r))){
                cnt+=2;
                l+=n-r;
                n=r;
                if (r==d)cnt--;
            }
            r--;
        }
        cout<<cnt<<"\n";
    }
}

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