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为什么一直在 time limited

Posted by timeoutle at 2011-05-15 21:07:06 on Problem 1049
#include<iostream>
#include<string>
#include<cmath>
#include<algorithm>
using namespace std;
char mem[256];
char ss[17]="0123456789ABCDEF";  
int main( )
{
	char a, b,ch;
	int i,num;
	bool flag;
	while ( true ){
		for ( i=0; i<256; i++ )
			if(scanf("%c",&mem[i])==EOF)
				return 0;
		scanf("%c",&ch);
		for ( i=0; i<256; i++ )
        {
            mem[i] -= 48;                                                
            if(mem[i] > 9)
               mem[i] -= 7;
        }
		if( mem[0] == 8 )
			break;
		num = 0;
		flag = true;
		while ( flag ){
			switch ( mem[num++] ){
				case 0:
					a = mem[( mem[num] << 4 ) + mem[num+1]];
					num+=2;
					break;
				case 1:
					mem[( mem[num] << 4 ) + mem[num+1]] = (a &= 15);
					num+=2;
					break;
				case 2:
					swap(a,b);
					break;
				case 3:
					a+=b;
                    b=a>>4;
					break;
				case 4:
					a++;
					break;
				case 5:
					a--;
					break;
				case 6:
                    if((a&=15)!=0)
                    {
                        num+=2;
                        break;
                    }
					break;
				case 7:
					num=((mem[num]<<4)+mem[num+1]); 	
					break;
				case 8:
					flag = false;
			}
		}
        for(i=0;i<256;i++)
          printf("%c",ss[mem[i]]);	
		printf("\n");
	}	
	system("pause");
	return 0;
}

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