Cod sursa(job #237645)

Utilizator luk17Luca Bogdan luk17 Data 30 decembrie 2008 12:41:17
Problema Abc2 Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.13 kb
#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
char a[10000001],cuv[30];
long treila[30],val1,val2,hash1[50001],hash2[50001];
int nrap;
long h1(int m, char *s)
{
	int i;
	long prod=0;
	for(i=0;i<m;i++)
		prod=(prod+treila[m-i-1]*(s[i]-'a'));
	return prod;
}

int caut_bin(long *p,int dim, long val)
{
	int m,pr,ul;
	pr=1;
	ul=dim;
	while(pr<=ul)
	{
		m=(pr+ul)/2;
		if(val==p[m])
			return 1;
		if(val<p[m])
			ul=m-1;
		else
			pr=m+1;

	}
	return 0;
}
int main()
{
	int i,n,m,k;
	
	FILE *f=fopen("abc2.in","r");
	freopen("abc2.out","w",stdout);
	fscanf(f,"%s\n",a);
	fscanf(f,"%s\n",cuv);
	
	n=strlen(a);
	m=strlen(cuv);
	treila[0]=1;
	for(i=1;i<=m;i++)
			treila[i]=treila[i-1]*3;
	
	hash1[1]=h1(m,cuv);	
	
	k=1;
	while(!feof(f))
	{
		fscanf(f,"%s",cuv);
		hash1[++k]=h1(m,cuv);	
	}
	
	std::sort(hash1+1,hash1+1+k);
	val1=h1(m,a);
	
	if(caut_bin(hash1,k,val1))
			nrap++;
	for(i=1;i<=n-m+1;i++)
	{
		val1=(val1-treila[m-1]*(a[i-1]-'a'))*3+a[i+m-1]-'a';
		if(caut_bin(hash1,k,val1))
			nrap++;
	}

		printf("%d",nrap);
	fclose(f);
return 0;
}