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Cod sursa(job #908693)
#include <fstream>
#include <cstring>
#include <vector>
#define Hmod 666013
using namespace std;
vector<unsigned int> H[Hmod];
char text[10000000];
inline short search(unsigned int x)
{
const unsigned int m = x%Hmod;
vector<unsigned int>::iterator i=H[m].begin(), stop=H[m].end();
while (i != stop)
{
if (*i == x)
return 1;
++i;
}
return 0;
}
inline unsigned int hash(char *cuv, unsigned int l)
{
unsigned int val=0, i;
for (i=0; i<l; ++i)
val = (val*3 + cuv[i]-'a');
return val;
}
int main()
{
ifstream in("abc2.in"); ofstream out("abc2.out");
char cuv[20];
unsigned int i, l, cnt=0, val, n, g=1;
in>>text>>cuv;
l = strlen(cuv);
val = hash(cuv, l);
H[val%Hmod].push_back(val);
while (in>>cuv)
{
val = hash(cuv, l);
H[val%Hmod].push_back(val);
}
for (i=1; i<l; ++i)
g *= 3;
val = hash(text, l);
cnt += search(val);
n = strlen(text);
for (i=l; i<n; ++i)
{
//val = ((val - ((text[i-l]-'a')*g)%Hmod + Hmod)*3 + text[i]-'a')%Hmod;
val = (val - (text[i-l]-'a')*g)*3 + text[i]-'a';
cnt += search(val);
}
out<<cnt;
return 0;
}