最长公共子串.txt

ACM资料大集合

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

//最长公共子串
//将公共子串问题转化过来，会有问题，比如stra串：aaaba, strb串：bba，strb[2]的a对应的是stra[]的哪个a呢?
#define NMAX 1200
#define CMAX 300
#define MIN -30000
int shuru[NMAX];
int ans[NMAX];
char stra[NMAX];
char strb[NMAX];
typedef struct link
{
	int where;
	link *next;
}link;

link* zimu[CMAX];
link* temp[CMAX];
link* tt;
int count[NMAX];//每种字符出现的个数

void print_t(int num)
{
	int i,j;
	for(i=0;i<CMAX;i++) temp[i]=zimu[i];
	for(i=0;i<num;i++)
	{
		j=stra[i]+1;
		if(temp[j]->next!=NULL)
		{
			printf("%d ",temp[j]->where);
			temp[j]=temp[j]->next;
		}
	}
	printf("\n");
}
int trans(int num,int xnum)
{
	int i,j,k;
	for(i=0;i<CMAX;i++)
	{
		count[i]=0;
		zimu[i]=(link *)malloc(sizeof(zimu[1]));
		zimu[i]->next=NULL;
		zimu[i]->where=-1;
		temp[i]=zimu[i];
	}
	for(i=0;i<num;i++)
	{
		j=stra[i]+1;
		tt=(link *)malloc(sizeof(zimu[1]));
		tt->next=NULL;
		tt->where=-1;
		temp[j]->next=tt;
		temp[j]->where=i;
		temp[j]=temp[j]->next;

		count[stra[i]+1]++;
	}

	for(i=0;i<CMAX;i++) temp[i]=zimu[i];
	for(i=0,k=0;i<xnum;i++)
	{
		j=strb[i]+1;
		if(temp[j]->next!=NULL)
		{
			shuru[++k]=temp[j]->where;
			printf("%d ",temp[j]->where);
			temp[j]=temp[j]->next;
		}
//		else printf("-1 ");		
	}
	printf("\n");
	return k;
}
int find(int key,int len)
{
	int low,high,mid,max=ans[0];
	low=1;high=len;mid=(low+high)/2;
	while(low<=high)
	{
		if(key<ans[mid]) high=mid-1;
		else
		{
			max=mid;
			low=mid+1;
		}
		mid=(low+high)/2;
	}
	if(max==ans[0]) return 0;
   	else return max;	
}

int solve(int num)
{
	int i,len=1,j;
	if(num==0) return 0;
	ans[0]=MIN;
	ans[1]=shuru[1];
	for(i=2;i<=num;i++)
	{
		if(shuru[i]>=ans[len])	ans[++len]=shuru[i];
		else
		{
			j=find(shuru[i],len);
			ans[j+1]=shuru[i];
		}
	}
	return len;
}


void print(int len)
{
	int i;
	printf("len=%d\n",len);
	for(i=1;i<=len;i++) printf("%d ",ans[i]);
	printf("\n");
}
int main()
{
	int alen,blen,knum,len;
	while(scanf("%s %s",&stra,&strb)!=EOF)
	{
		alen=strlen(stra);
		blen=strlen(strb);
		knum=trans(alen,blen);
		printf("%d\n",solve(knum));
	}
//	print(len);
//	print_t(slen);
//	int i,num,len;
//	scanf("%d",&num);
//	for(i=1;i<=num;i++) scanf("%d",&shuru[i]);
//	len=solve(num);
//	print(len);
	return 0;
}