ZOJ 3818 正则表达式

Pretty Poem

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Time Limit: 2 Seconds      Memory Limit: 65536 KB

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Poetry is a form of literature that uses aesthetic and rhythmic qualities of language. There are many famous poets in the contemporary era. It is said that a few ACM-ICPC contestants can even write poetic code. Some poems has a strict rhyme scheme like "ABABA" or "ABABCAB". For example, "niconiconi" is composed of a rhyme scheme "ABABA" with A = "ni" and B = "co".

More technically, we call a poem pretty if it can be decomposed into one of the following rhyme scheme: "ABABA" or "ABABCAB". The symbolA,B and C are different continuous non-empty substrings of the poem. By the way, punctuation characters should be ignored when considering the rhyme scheme.

You are given a line of poem, please determine whether it is pretty or not.

Input

There are multiple test cases. The first line of input contains an integer T indicating the number of test cases. For each test case:

There is a line of poem S (1 <= length(S) <= 50). S will only contains alphabet characters or punctuation characters.

Output

For each test case, output "Yes" if the poem is pretty, or "No" if not.

Sample Input

3niconiconi~pettan,pettan,tsurupettanwafuwafu

Sample Output

YesYesNo

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唉，逗逼一开始没想到用正则，C++各种WA。

import java.io.File;import java.util.Scanner;import java.util.regex.Pattern;public class Main {Scanner in; boolean debug = true;public void go()throws Exception{debug = false;File file = new File("C:\\Users\\Admin\\Desktop\\in.txt");if(!debug)in = new Scanner(System.in);else in = new Scanner(file);int t; t = in.nextInt();while(t-- > 0){String str = in.next();boolean flag = false;str = str.replaceAll("\\W|_", "");for(int i = 1; i <= str.length(); i++){String a = str.substring(0, i);for(int j = i+1; j <= str.length(); j++){String b = str.substring(i, j);if(a.equals(b)) continue;Pattern pat = Pattern.compile(a+b+a+b+a);Pattern pat2 = Pattern.compile(a+b+a+b+"\\w+"+a+b);Pattern pat3 = Pattern.compile(a+b+a+b+b+a+b);Pattern pat4 = Pattern.compile(a+b+a+b+a+a+b);boolean ok = pat3.matcher(str).matches() || pat4.matcher(str).matches();if(!ok && (pat.matcher(str).matches() || pat2.matcher(str).matches())){flag = true;}}}if(flag){System.out.println("Yes");}elseSystem.out.println("No");}}public static void main(String[] args) throws Exception{Main ma = new Main();ma.go();}}