답안 #339731

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
339731	2020-12-26T05:18:59 Z	nandonathaniel	Palindromic Partitions (CEOI17_palindromic)	C++14	100 / 100	215 ms	45704 KB

palindromic

#include<bits/stdc++.h>
using namespace std;
const int MAXN=1000005,MOD=1e9+7,inv=280000002;
 
int pref[MAXN],pkt[MAXN];
int dp[MAXN],N;
 
int get(int L,int R){
	if(L>R)return 0;
	return (pref[R]-((1LL*pref[L-1]*pkt[R-L+1])%MOD)+MOD)%MOD;
}

int DP(int L){
	int R=N+1-L;
	if(L>R)return 0;
	int &ret=dp[L];
	if(ret!=-1)return ret;
	ret=1;
	for(int i=1;i<=(R-L+1)/2;i++){
		if(get(L,L+i-1)==get(R-i+1,R)){
			ret=max(ret,2+DP(L+i));
			return ret;
		}
	}
	return ret;
}
 
int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int t;
	string s;
	cin >> t;
	while(t--){
		cin >> s;
		N=(int)s.length();
		pkt[0]=1;
		for(int i=0;i<N;i++){
			pref[i+1]=(26LL*pref[i]+s[i]-'a')%MOD;
			pkt[i+1]=(26LL*pkt[i])%MOD;
		}
		memset(dp,-1,sizeof(dp));
		cout << DP(1) << '\n';
	}
	return 0;
}

Subtask #1

15.0 / 15.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4204 KB	Output is correct
2	Correct	5 ms	4204 KB	Output is correct
3	Correct	4 ms	4204 KB	Output is correct
4	Correct	4 ms	4204 KB	Output is correct
5	Correct	4 ms	4204 KB	Output is correct

Subtask #2

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4204 KB	Output is correct
2	Correct	5 ms	4204 KB	Output is correct
3	Correct	4 ms	4204 KB	Output is correct
4	Correct	4 ms	4204 KB	Output is correct
5	Correct	4 ms	4204 KB	Output is correct
6	Correct	4 ms	4204 KB	Output is correct
7	Correct	4 ms	4204 KB	Output is correct
8	Correct	6 ms	4204 KB	Output is correct
9	Correct	6 ms	4204 KB	Output is correct

Subtask #3

25.0 / 25.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4204 KB	Output is correct
2	Correct	5 ms	4204 KB	Output is correct
3	Correct	4 ms	4204 KB	Output is correct
4	Correct	4 ms	4204 KB	Output is correct
5	Correct	4 ms	4204 KB	Output is correct
6	Correct	4 ms	4204 KB	Output is correct
7	Correct	4 ms	4204 KB	Output is correct
8	Correct	6 ms	4204 KB	Output is correct
9	Correct	6 ms	4204 KB	Output is correct
10	Correct	6 ms	4716 KB	Output is correct
11	Correct	5 ms	4460 KB	Output is correct
12	Correct	7 ms	4460 KB	Output is correct
13	Correct	6 ms	4460 KB	Output is correct

Subtask #4

40.0 / 40.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4204 KB	Output is correct
2	Correct	5 ms	4204 KB	Output is correct
3	Correct	4 ms	4204 KB	Output is correct
4	Correct	4 ms	4204 KB	Output is correct
5	Correct	4 ms	4204 KB	Output is correct
6	Correct	4 ms	4204 KB	Output is correct
7	Correct	4 ms	4204 KB	Output is correct
8	Correct	6 ms	4204 KB	Output is correct
9	Correct	6 ms	4204 KB	Output is correct
10	Correct	6 ms	4716 KB	Output is correct
11	Correct	5 ms	4460 KB	Output is correct
12	Correct	7 ms	4460 KB	Output is correct
13	Correct	6 ms	4460 KB	Output is correct
14	Correct	215 ms	45704 KB	Output is correct
15	Correct	104 ms	33288 KB	Output is correct
16	Correct	154 ms	22408 KB	Output is correct
17	Correct	111 ms	20232 KB	Output is correct