输出给定字符串的全部连续子串 - 阿里实习生电面题目


http://www.lai18.com/content/1587564.html
给定一个字符串,输出其所有的连续子串,如给定字符串为abcd,则要输出其全部连续子串为:a,b,c,d,ab,bc,cd,abc,bcd,abcd

1、刚开始,输入abcd,我们从后往前遍历,

abcd->abc->ab->a,一次递归完成

2、将原字符串的第一个字符截下,用后面的字符组成一个新的字符串,开始新的遍历,即bcd,开始新的遍历,

bcd->bc->b

3、继续下去,cd->c

4、最后是d

 public void successiveString(String str) {
  for (int i = str.length(); i >= 0; i--) // need optimization
   System.out.println(str.substring(0, i));
  if (str.length() > 1)
   successiveString(str.substring(1));
 }

 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  String str = sc.nextLine();
  new SuccessiveString().successiveString(str);
 }
http://www.itmian4.com/thread-4340-1-1.html
  1. public static void main(String[] args) {
  2.                 
  3.                 Scanner ss=new Scanner(System.in);
  4.                 
  5.                 String s=ss.nextLine();
  6.                 
  7.                 char[] c=s.toCharArray();
  8.                 
  9.                 for(int i=0;i<c.length;i++)
  10.                 {
  11.                         System.out.print(c[i]+" ");
  12.                         
  13.                         StringBuffer temp=new StringBuffer();
  14.                         
  15.                         temp.append(c[i]);
  16.                         
  17.                         for(int j=i+1;j<c.length;j++)
  18.                         {
  19.                                 temp.append(c[j]);
  20.                                                         
  21.                                 System.out.print(temp.toString()+" ");
  22.                                 
  23.                         }
  24.                         
  25.                 }
http://blog.csdn.net/ns_code/article/details/21043665
void AllSubstring3(const char *str,char *arr)
{
 //穿入的arr的长度为len+1,最后一个位置保存'\0'
 int i,j;
 unsigned int len = strlen(str);
 strcpy(arr,str);
 for(i=len-1;i>=0;i--)
 {
  arr[i+1] = '\0';
  for(j=i;j>=0;j--)
   printf("%s\t",&arr[j]);
  printf("\n");
 }
}
不考虑输出字符串重复的问题吗? 比如输入“aab" 应该输出a,b,aab,aa,ab

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