hdu1042 N!(大数)

      
      

       
       1
       
       
2
       
       
3
      
      
      
      

       
       
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3.
      
      

      
      

       
       1
       
       
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6
      
      
      
      

       
       
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3.
      
      

      
      

       
       import 
       
       java.
       
       math.
       
       BigInteger;
       
       

       
       import 
       
       java.
       
       util.
       
       Scanner;
       
       

       
       

       
       public 
       
       class 
       
       Main {
       
       

       
       
  
       
       public 
       
       static 
       
       void 
       
       main(
       
       String[] 
       
       args) {
       
       
    
       
       // TODO Auto-generated method stub
       
       
    
       
       Scanner 
       
       sca
       
       =
       
       new 
       
       Scanner(
       
       System.
       
       in);
       
       
    
       
       BigInteger 
       
       res[]
       
       =
       
       new 
       
       BigInteger[
       
       10000
       
       +
       
       10];
       
       
    
       
       res[
       
       0]
       
       =
       
       BigInteger.
       
       ONE;
       
       
    
       
       for(
       
       int 
       
       i
       
       =
       
       1;
       
       i
       
       <
       
       10000
       
       +
       
       1;
       
       i
       
       ++){
       
       
      
       
       res[
       
       i]
       
       =
       
       res[
       
       i
       
       -
       
       1].
       
       multiply(
       
       BigInteger.
       
       valueOf(
       
       i));
       
       
    }
       
       
    
       
       while(
       
       sca.
       
       hasNext()){
       
       
      
       
       int 
       
       x
       
       =
       
       sca.
       
       nextInt();
       
       
      
       
       System.
       
       out.
       
       println(
       
       res[
       
       x]);
       
       
    }
       
       
  }
       
       

       
       
}
      
      
      
      

       
       
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