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请高手来看看,为什么这个总是wrong answer?

Posted by yelin at 2009-03-05 16:47:40 on Problem 1003
#include<stdio.h>
int main()
{
    double i=1;
	double len,sum=0;
	scanf("%lf",&len);
	if(len>=0.01&&len<=5.20)
	{
		while(sum<=len)
           {
		i++;
		sum=sum+(1/i);
	    }
	printf("%d card(s)\n",(int)(i-1));
	}
	return 0;
}

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