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Re:动态分配和静态分配为什么差距这么大?

Posted by ziooooozi at 2007-09-13 23:05:25 on Problem 2577
In Reply To:动态分配和静态分配为什么差距这么大? Posted by:jiaohang at 2005-10-05 11:05:51
> 只改p的分配方式,一个是0MS,一个超时。为什么?
> 
> #include <stdio.h>
> 
> void dv (int a,int *t)
> {
>     t[0]=a/100;
>     a-=t[0]*100;
>     t[1]=a/10;
>     t[2]=a-t[1]*10; 
> }
> int main()
> {
> //    int p[1000];//这行超时
> int *p=new int[1000];//这行通过
> int n,ps,r=1,rg[10],i; 
>     
>     int t[3]; 
> 
>     for(n=0;scanf("%d",&p[n])!=EOF;n++) 
>     {}
>     for(i=0;i<10;i++)rg[i]=0;
>     ps=0;
>     while(p[ps]!=100)
>     {
>         r++;
>         dv(p[ps],t);
>         switch(t[0])
>         {
>             case 2:
>                 rg[t[1]]=t[2]; 
>                 break;
>             case 3:
>                 rg[t[1]]+=t[2]; 
>                 if(rg[t[1]]>=1000 )rg[t[1]]-=1000;
>                 break;
>             case 4:
>                 rg[t[1]]=rg[t[1]]*t[2]%1000; 
>                 break;
>             case 5:
>                 rg[t[1]]=rg[t[2]]; 
>                 break;
>             case 6:
>                 rg[t[1]]+=rg[t[2]]; 
>                 if(rg[t[1]]>=1000 )rg[t[1]]-=1000;
>                 break;
>             case 7:
>                 rg[t[1]]=rg[t[1]]*rg[t[2]]%1000; 
>                 break;
>             case 8:
>                 rg[t[1]]=p[rg[t[2]]]; 
>                 break;
>             case 9:
>                 p[rg[t[2]]]=rg[t[1]]; 
>                 break;
>             case 0:
>                 if(rg[t[2]])
>                 ps=rg[t[1]]-1;
>                 break;
>         }    
>         ps++;
>     }
>     printf("%d",r);
>     return 0;    
>          
>         
>          
> }

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