SRM 670 div2 A BearSong

  Problem Statement  
 Problem Statement for BearSong

Problem Statement

 

Bear Limak has recently learned about musical notes. He then listened to a song and noticed that some notes appeared less often than others. In fact, some notes were so rare that they appeared in the song only once!

Limak now wants to look for such notes in other songs. Write a program that will look for the rare notes.

You are given a int[] notes that describes a song. Each number in notes represents one note of the song. Different numbers represent different notes, equal numbers represent equal notes.

Compute and return the number of notes that occur exactly once in the given song.

 

Definition

 Class:BearSongMethod:countRareNotesParameters:int[]Returns:intMethod signature:int countRareNotes(int[] notes)(be sure your method is public)   

Constraints

-notes will contain between 1 and 50 elements, inclusive.-Each element in notes will be between 1 and 1000, inclusive. 

Examples

0)  

{9,10,7,8,9}

Returns: 3

The rare notes are the notes 7, 8, and 10. Each of these notes occurs exactly once in the whole song. The note 9 occurs twice, so it is not a rare note1)  

{8,8,7,6,7,3,5,10,9,3}

Returns: 4

Each of the notes 5, 6, 9, and 10 occurs exactly once in this song.2)  

{234,462,715,596,906}

Returns: 5

3)  

{17}

Returns: 1

4)  

{1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000,1000}

Returns: 0

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This problem was used for: 
       Single Round Match 673 Round 1 - Division II, Level One

题意：给你一个序列，求只出现一次的数的种数

很久没打TC了，忘记要加头文件，一直编译错误...............