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Re:快速排序,加二分查找!!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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