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Re:快速排序,加二分查找!!

Posted by Yikkkke at 2020-06-08 20:34:45 on Problem 2503
In Reply To:快速排序,加二分查找!! Posted by:huangchang9001 at 2011-03-16 21:47:08
> 之前提交的简单排序,顺序查找,后来改成归并排序加二分查找,最后翻书发现快速排序跟快,改后加上二分查找终于通过了!!!
> 以前上课老师讲的都还给他了!每次做题都习惯用简单排序,看来要做多看书!
> #include<stdio.h>
> #include<string.h>
> #include<stdlib.h>
> char chip[100001][30];
> char bhip[100001][30];
> int  idex[100001];
> char w[50];
> int L,yes;
> void qs(int low,int heigh)
> {
> 	int qid,i,j;
> 	if(low<heigh)
> 	{
> 		qid=idex[low];
> 		i=low;
> 		j=heigh;
> 		while(i<j)
> 		{
> 			while(i<j&&strcmp(bhip[idex[j]],bhip[qid])>=0) 
> 				j--;
> 			if(i<j)
> 				idex[i++]=idex[j];
> 			while(i<j&&strcmp(bhip[idex[i]],bhip[qid])<=0)
> 				i++;
> 			if(i<j)
> 				idex[j--]=idex[i];
> 		}
> 		idex[i]=qid;
> 		qs(low,j-1);
> 		qs(i+1,heigh);
> 	}
> }
> void main()
> {
> 	int i,j,k,t;
> 	L=0;
> 	while(gets(w)!=NULL&&w[0]!='\0')
> 	{
> 		sscanf(w,"%s %s",chip[L],bhip[L]);
> 		idex[L]=L;
> 		L++;
> 	}
> 	qs(0,L-1);
> 	while(gets(w)!=NULL)
> 	{
> 		i=0;
> 		j=L-1;
> 		yes=0;
> 		while(i<=j)
> 		{
> 			k=(i+j)/2;
> 			t=strcmp(bhip[idex[k]],w);
> 			if(t>0)
> 			{
> 				j=k-1;
> 			}
> 			else if(t<0)
> 			{
> 				i=k+1;
> 			}
> 			else
> 			{
> 				yes=1;
> 				break;
> 			}
> 
> 		}
> 		if(yes==1)
> 			printf("%s\n",chip[idex[k]]);
> 		else
> 		{
> 			printf("eh\n");
> 		}
> 
> 	}
> }

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