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用kmp写,wa了一晚上,最后发现。。。。。。尼玛原来用strstr也可以轻松水过orz。。代码来一发

Posted by 4414811995 at 2015-04-23 22:26:56 on Problem 3450
#include<stdio.h>
#include<string.h>
#include<iostream>
#include<math.h>
const int maxn=4050;
char str[maxn][200];
int len[maxn];
int main()
{
	int n;
	while(scanf("%d",&n)!=EOF&&n)
	{
		char temp[200];
		char ans[200];
		int max=0,t;
		int minnum=0;
		int min=10000;
		for(int i=1;i<=n;i++)
		{
			scanf("%s",str[i]);
			len[i]=strlen(str[i]);
			if(len[i]<min)
			{
				min=len[i];
				minnum=i;
			}
		}
		//printf("%s\n",str[minnum])
	    for(int i=0;i<=min-2;i++)
	    {
	    	for(int o=1;o<=min-i;o++)
	    	{
	    	/*if(min-i-o+1<max)
	    	break;*/
	    	int k=0;
	    	 //memset(temp,'\0',sizeof(temp));
	    	for(int j=i;j<=min-o;j++)
	    	{
	    		temp[k++]=str[minnum][j];
	    	}
	    	temp[k]='\0';
	    	//printf("%s\n",temp);
	    for(t=1;t<=n;t++)
	    		{
	    			if(t==minnum)
	    			continue;
	    		   char *p=strstr(str[t],temp);
	    			if(p==NULL)
	    			{
	    				break;
	    			}
	    		}
	    		if(t==n+1)
	    		{
	    			if(k==max)
	    			{
	    				if(strcmp(ans,temp)>0)
	    				strcpy(ans,temp);
	    			}
	    				 if(k>max)
	    				{
	    					max=k;
	    					strcpy(ans,temp);
	    				}
	    			}
                }
             }
	    if(max==0)
	    {
	    	printf("IDENTITY LOST\n");
	    }
	    else
	    {
	     puts(ans); 
	    	
	    }
	}
	return 0;
}
 

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