Codeforces Round #427 (Div. 2) D dp
3 seconds
256 megabytes
standard input
standard output
Palindromic characteristics of string s with length |s| is a sequence of |s| integers, where k-th number is the total number of non-empty substrings of s which are k-palindromes.
A string is 1-palindrome if and only if it reads the same backward as forward.
A string is k-palindrome (k > 1) if and only if:
- Its left half equals to its right half.
- Its left and right halfs are non-empty (k - 1)-palindromes.
The left half of string t is its prefix of length ⌊|t| / 2⌋, and right half — the suffix of the same length. ⌊|t| / 2⌋ denotes the length of string t divided by 2, rounded down.
Note that each substring is counted as many times as it appears in the string. For example, in the string "aaa" the substring "a" appears 3 times.
The first line contains the string s (1 ≤ |s| ≤ 5000) consisting of lowercase English letters.
Print |s| integers — palindromic characteristics of string s.
abba
6 1 0 0
abacaba
12 4 1 0 0 0 0
In the first example 1-palindromes are substring «a», «b», «b», «a», «bb», «abba», the substring «bb» is 2-palindrome. There are no 3- and 4-palindromes here.
题意:给你一个字符串 问1~len阶的子串的个数 一个回文串可以称为一阶子串 k阶子串的左右两边为k-1阶子串
题解:dp[i][j]表示原字符串中i~j为dp[i][j]阶
#pragma comment(linker, "/STACK:102400000,102400000")
#include <bits/stdc++.h>
#include <cstdlib>
#include <cstdio>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <cctype>
#include <map>
#include <set>
#include <queue>
#include <bitset>
#include <string>
#include <complex>
#define ll __int64
#define mod 1000000007
using namespace std;
char s[];
int re[];
int dp[][];
int main()
{
scanf("%s",s+);
int len=strlen(s+);
for(int i=;i<=len;i++){
dp[i][i]=;
re[]++;
if(i!=len&&s[i]==s[i+]){
dp[i][i+]=;
re[]++;
re[]++;
}
}
for(int i=;i<=len;i++)//枚举字串的长度
for(int j=;j+i-<=len;j++){
if(dp[j+][j+i-]&&s[j]==s[i+j-]){
dp[j][j+i-]=dp[j][j+i/-]+;
for(int k=;k<=dp[j][i+j-];k++) re[k]++;
}
}
for(int i=;i<=len;i++)
printf("%d ",re[i]);
return ;
}
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