一些小算法代码，看各位能否看懂

import java.util.Scanner;

/**
 * Created by junyi.pc on 2017/1/25.
 */
public class Main {
   static  int count1 = 0;
    public static void f(double a[],int n,int cur){

             if(cur==9){
                   if(a[0]+a[1]/a[2]+((a[3]*100+a[4]*10+a[5])/(a[6]*100+a[7]*10+a[8]))==10){
                       count1++;
                       System.out.println(a[0]+"+"+a[1]+"/"+a[2]+"+"+a[3]+"*"+a[4]+"*"+a[5]+"/"+a[6]+"*"+a[7]+"*"+a[8]+"n=="+count1);
                   }
                    return ;
                }

                  for(int i=1;i<=n;i++){
                       boolean ok=true;
                     for(int j=0;j<cur;j++){
                         if(a[j]==i)
                             ok=false;
                     }
                      if(ok==true){
                          a[cur]=i;
                          f(a,9,cur+1);
                      }
                  }
                }

    public static void main(java.lang.String[] args){

        double a[]={1,2,3,4,5,6,7,8,9};
        f(a,9,0);

    }
}




import java.util.Scanner;

/**
 * Created by junyi.pc on 2017/1/25.
 */
public class Main {
   static  int count1 = 0;
    public static void f(double a[],int n,int cur){

             if(cur==10){
                   if(a[0]<a[1]&&a[0]<a[2]&&a[1]<a[3]&&a[1]<a[4]&&a[2]<a[4]&&a[2]<a[5]&&a[3]<a[6]&&a[3]<a[7]&&a[4]<a[7]&&a[4]<a[8]&&a[5]<a[8]&&a[5]<a[9]){
                       count1++;
                       System.out.println(a[0]+""+a[1]+a[2]+""+a[3]+""+a[4]+""+a[5]+""+a[6]+""+a[7]+""+a[8]+""+a[9]+"n=="+count1);
                   }
                    return ;
                }

                  for(int i=0;i<n;i++){
                       boolean ok=true;
                     for(int j=0;j<cur;j++){
                         if(a[j]==i)
                             ok=false;
                     }
                      if(ok==true){
                          a[cur]=i;
                          f(a,10,cur+1);
                      }
                  }
                }

    public static void main(java.lang.String[] args){

        double a[]={0,1,2,3,4,5,6,7,8,9};
        f(a,10,0);

    }
}



import java.util.Scanner;

/**
 * Created by junyi.pc on 2017/1/25.
 */
public class Main {

    public static void f(int a[],int k,int m,char b[]) {

        if(k==6){
            b[5]=0;
            if (m==0){
             for(int n=0;n<6;n++)
                 System.out.print(b[n]);

                System.out.println();
            }
            return;
        }
        for(int i=0;i<=a[k];i++){
         for(int j=0;j<i;j++){
             b[5-m+j]=(char)(k+'A');
         }
            f(a,k+1,m-i,b);
        }

    }
    public static void main(java.lang.String[] args){


        int a[]={4,2,2,1,1,3};
        char b[]=new  char[1024];
        f(a,0,5,b);

    }
}





import java.util.Scanner;

/**
 * Created by junyi.pc on 2017/1/25.
 */
public class Main {

    public static void f(int m,int n) {

           int row;
           int col;

          for(row=0;row<n;row++){

              for(col=0;col<m;col++){
                  System.out.print("+---");
              }
              System.out.println("+");

              for(col=0;col<m;col++){
                  System.out.print("|"+"   ");
              }
              System.out.println("|");
          }

        System.out.print("+");
        for(col=0;col<m;col++){
            System.out.print("---+");
        }
        System.out.println();

    }
    public static void main(java.lang.String[] args){


        f(10,4);

    }
}





import java.util.Scanner;

/**
 * Created by junyi.pc on 2017/1/25.
 */

public class Main {

    public static void  f(int x) {

      int i;
        for(i=0;i<32;i++)
            System.out.print((x>>(31-i))&1);
        System.out.println();

        x=x^((~x&(-(~x)))-1);
        for(i=0;i<32;i++)
            System.out.print((x>>(31-i))&1);
        System.out.println();
    }

    public static void main(java.lang.String[] args){

        f(103);
        f(12);

    }
}