Looking for water Wang 2

Package test2; 

Import java.util.Scanner;
 / * 
 * Looking Wang water 
 * / 
public  class test2 {
     public  static  void main (String [] args) {
         int [] A = null ; // stored message ID 
        Scanner SC = new new Scanner (the System.in); 
        System.out.println ( "Please enter the number of total posts:" );
         int NUM = sc.nextInt (); 
        A = new new  int [NUM];
        int D = 0 ;;
        for ( int i=0;i<num;i++){
           d=i+1;
           System.out.print("请输入第"+d+"个帖子数：");
           a[i]=sc.nextInt();
       }
        
        int id = 0;
        int c=0;


        
        for(int i=0;i<a.length;i++)
        {
            if(c==0) {
                id=a[i];
                c=1;
            }else if(c>0){
                if(a[i]==id) {
                    C = C +. 1 ; 
                } the else  IF (! A [I] = ID) { 
                    C = C-. 1 ; 
                } 
            } 
          
        } 
        System.out.println ( "King ID for the water:" + ID); 
        
    } 

    
}

This is traversed only once, by a for loop to find water king