CCF topic: string Matching

Question number:	201409-3
Question Name:	String match
Time limit:	1.0s
Memory Limit:	256.0MB
Problem Description:	Problem description Gives a string and multiline text, where the string appears in those lines. Your program also needs to support case sensitive options: When an option is on, the uppercase and lowercase letters of the same letter are treated as different characters; When the item is turned off, the uppercase and lowercase letters of the same letter are considered to be the same characters. Input format The first line of the input contains a string s, which is made up of uppercase and lowercase English letters. The second line contains a number that represents the case-sensitive option, when the number is 0, the case is not sensitive, and when the number is 1, it is case sensitive. The third line contains an integer n that represents the number of lines of the given text. Next n rows, each line contains a string, and the string consists of uppercase and lowercase letters, without spaces and other characters. Output format Outputs multiple lines, each containing a string, in the order in which they appear, giving the lines that contain the string s. Sample input Hello 1 5 HelloWorld Hihihellohihi Grepisagreattool HELLO Helloisnothello Sample output HelloWorld Hihihellohihi Helloisnothello Sample Description In the example above, the fourth string, although also a hello, is not case-sensitive. If you change the second line of input to 0, the fourth string should be output. Measuring use case size and conventions 1<=n<=100, the length of each string does not exceed 100.

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Solution:

Package Csp3;import Java.util.scanner;public class Main3 {public static void main (string[] args) {new Main3 (). Run ();} public void Run () {Scanner sc=new Scanner (system.in); String str=sc.next (); int flag=sc.nextint (); int n=sc.nextint (); String[] s=new string[n];for (int i=0;i<n;i++) {s[i]=sc.next ();   Use Nextline () Here, you can enter only 4 rows}if (flag==1) {for (int i=0;i<n;i++) {if (S[i].indexof (str) >=0) {  //indexof indicates whether to include substrings , including return value >=0SYSTEM.OUT.PRINTLN (S[i]);}}} else{for (int i=0;i<n;i++) {if (S[i].touppercase (). IndexOf (Str.touppercase ()) >=0) System.out.println (S[i]);}}}

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Knowledge Supplement:

The difference between next () and nextline () in scanner

When you use the Nextline () method, all the contents of the row remaining are read, including the newline character, and then the focus moves to the beginning of the next line. Therefore, you cannot receive a variable of type string that is entered in the next line.

The next () method receives the next string type variable as a line break or a space character.

Two examples (example selected from http://www.cnblogs.com/gold-worker/archive/2013/04/10/3013063.html)

Example 1:

Package Cn.dx;import Java.util.scanner;public class Scannertest {public    static void Main (string[] args) {        Scanner in =  new Scanner (system.in);        System.out.println ("Please enter an integer");        while (In.hasnextint ()) {            int num = In.nextint ();            System.out.println ("Please enter a string");            String str = in.nextline ();            System.out.println ("num=" +num+ ", str=" +str);            System.out.println ("Please enter an integer");}}}    

Results:

Please enter an integer
1231
Please enter a string
Num=1231,str=
Please enter an integer

The second parameter of type string is not read in.

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Example 2:

Package Cn.dx;import Java.util.scanner;public class Scannertest {public    static void Main (string[] args) {        Scanner in =  new Scanner (system.in);        System.out.println ("Please enter an integer");        while (In.hasnextint ()) {            int num = In.nextint ();            System.out.println ("Please enter a string");            String str = In.next ();            System.out.println ("num=" +num+ ", str=" +str);            System.out.println ("Please enter an integer");}}}    

Results:

Please enter an integer
123
Please enter a string
Sdjakl
Num=123,str=sdjakl

Please enter an integer
213 Jdskals
Please enter a string
Num=213,str=jdskals
Please enter an integer

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CCF topic: string Matching