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讨论讨论吧!AC了的人给点提示好吗??

Posted by xhu_li at 2009-01-01 20:30:35 on Problem 2418
这道题看了看其他资料,说要用二叉树来做,不用二叉树难道就不行吗??那位高手给点提示!!
以下是我写的代码,没有涉及二叉树,但是很遗憾,超时,在自己的机器上测了数据是对的,帮帮忙,看看可以哪里可以修改以下,提高下效率

#include<stdio.h>
#include<string.h>
#include<math.h>
struct tree
{
	char name[30];
	float per;
};
struct tree str[10000];
int b[10000],t;
int f(char *s)
{
	int i;
	for(i=0;i<t;i++)
	{
		if(strcmp(str[i].name,s)==0)
			return i;
	}
	strcpy(str[t].name,s);
	t++;
	return t-1;
}
void main()
{
	char s[30],str1[30];
	int i,n,j,count=0;
	float k;
	memset(b,0,sizeof(b));
	t=0;
	while(gets(s)!=NULL)
	{
		count++;
		n=f(s);
		b[n]++;
	}
	for(i=0;i<t;i++)
	{
		str[i].per=b[i]*1.0/count;
	}
	for(i=0;i<t-1;i++)
	{
		for(j=i;j<t;j++)
		{
			if(strcmp(str[i].name,str[j].name)>0)
			{
				strcpy(str1,str[i].name);
				strcpy(str[i].name,str[j].name);
				strcpy(str[j].name,str1);
				k=str[i].per;
				str[i].per=str[j].per;
				str[j].per=k;
			}
		}
	}
	for(i=0;i<t;i++)
		printf("%s %.4f\n",str[i].name,str[i].per*100);
}

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