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  • Codeforces Round #272 (Div. 1)C(字符串DP)

    C. Dreamoon and Strings
    time limit per test
    1 second
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    Dreamoon has a string s and a pattern string p. He first removes exactly x characters from s obtaining string s' as a result. Then he calculates  that is defined as the maximal number of non-overlapping substrings equal to p that can be found in s'. He wants to make this number as big as possible.

    More formally, let's define  as maximum value of  over all s' that can be obtained by removing exactly x characters froms. Dreamoon wants to know  for all x from 0 to |s| where |s| denotes the length of string s.

    Input

    The first line of the input contains the string s (1 ≤ |s| ≤ 2 000).

    The second line of the input contains the string p (1 ≤ |p| ≤ 500).

    Both strings will only consist of lower case English letters.

    Output

    Print |s| + 1 space-separated integers in a single line representing the  for all x from 0 to |s|.

    Sample test(s)
    input
    aaaaa
    aa
    
    output
    2 2 1 1 0 0
    
    input
    axbaxxb
    ab
    
    output
    0 1 1 2 1 1 0 0

    题意:RT

    思路:dp[i][j]表示s的前i个字符一共匹配了j个p串,删掉的最少字符数

                先用一个数组en[i]预处理出在s串的每一个位置i。直到能最早匹配p串的结束的位置

                转移为dp[ en[i+1] ][j+1]= min (dp[ en[i+1] ][j+1] 。dp[ i ][j] + (en[i+1]-i-m) )

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  • 原文地址:https://www.cnblogs.com/zfyouxi/p/5086762.html
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