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#include <cstdio>
#include "message.h"
#include "poszukiwania.h"

const int primes = 3;
int pTab[] = { 999992891, 975192863, 995192909 };
int gTab[] = { 32257, 6581, 21868 };
int hTab[] = { 487115612, 724170722, 198374149 };

int nodes, id;
int sigLen, seqLen, diff;
int gSigLen[3];

int hSig[3], hSeq[3];
int h1[3], h2[3], h3[3];

bool porownaj()
{
	for (int nr = 0; nr < primes; ++nr) {
		if (hSig[nr] != hSeq[nr]) {
			return false;
		}
	}
	return true;
}

int potega(int a, int n, int mod)
{
	int r = 1;
	while (n > 0) {
		if ((n & 1) == 1) {
			r = ((long long)r * a) % mod;
		}
		n >>= 1;
		a = ((long long)a * a) % mod;
	}
	return r;
}

int obliczHashSig(int nr, int start, int stop)
{
	int hash = 0;
	int g = gTab[nr];
	int p = pTab[nr];
	int gg = potega(g, start, p);

	for (int i = start; i < stop; i++) 
	{
		int s = SignalAt(i) + 1;

		hash += ((long long)gg * s) % p;
		if (hash >= p) {
			hash -= p;
		}

		gg = ((long long)gg * g) % p;
	}

	return hash;
}

void obliczHashSig()
{
	int sigStart = ((long long)id * sigLen / nodes) + 1;
	int sigStop = ((long long)(id + 1) * sigLen / nodes) + 1;

	for (int nr = 0; nr < primes; ++nr) {
		hSig[nr] = obliczHashSig(nr, sigStart, sigStop);
	}
	
	if (id == 0) 
	{
		for (int i = 1; i < nodes; ++i)
		{
			Receive(i);
			for (int nr = 0; nr < primes; ++nr) 
			{
				hSig[nr] += GetInt(i);
				if (hSig[nr] >= pTab[nr]) {
					hSig[nr] -= pTab[nr];
				}
			}
		}

		for (int i = 1; i < nodes; ++i)
		{
			for (int nr = 0; nr < primes; ++nr) {
				PutInt(i, hSig[nr]);
			}
			Send(i);
		}
	}
	else 
	{
		for (int nr = 0; nr < primes; ++nr) {
			PutInt(0, hSig[nr]);
		}
		Send(0);

		Receive(0);
		for (int nr = 0; nr < primes; ++nr) {
			hSig[nr] = GetInt(0);
		}
	}
}

int obliczHashSeq(int nr, int start, int stop, bool odJedynki)
{
	int hash = 0;
	int g = gTab[nr];
	int p = pTab[nr];
	int gg = odJedynki ? g : potega(g, start, p);

	for (int i = start; i < stop; i++)
	{
		int s = SeqAt(i) + 1;

		hash += ((long long)gg * s) % p;
		if (hash >= p) {
			hash -= p;
		}

		gg = ((long long)gg * g) % p;
	}

	return hash;
}

void obliczHashSeq()
{
	int start = ((long long)id * sigLen / nodes) + 1;
	int stop = ((long long)(id + 1) * sigLen / nodes) + 1;

	for (int nr = 0; nr < primes; ++nr) {
		hSeq[nr] = obliczHashSeq(nr, start, stop, false);
	}

	if (id == 0)
	{
		for (int i = 1; i < nodes; ++i)
		{
			Receive(i);
			for (int nr = 0; nr < primes; ++nr)
			{
				hSeq[nr] += GetInt(i);
				if (hSeq[nr] >= pTab[nr]) {
					hSeq[nr] -= pTab[nr];
				}
			}
		}
	}
	else
	{
		for (int nr = 0; nr < primes; ++nr) {
			PutInt(0, hSeq[nr]);
		}
		Send(0);
	}
}

void przesun(int nr, int start, int prev, int next) {
	int p = pTab[nr];
	int g = gTab[nr];
	int h = hTab[nr];
	int gg = gSigLen[nr];

	hSeq[nr] -= ((long long)g * prev) % p;
	if (hSeq[nr] < 0) {
		hSeq[nr] += p;
	}
	hSeq[nr] = ((long long)h * hSeq[nr]) % p;

	hSeq[nr] += ((long long)gg * next) % p;
	if (hSeq[nr] >= p) {
		hSeq[nr] -= p;
	}
}

int obliczPrzesuwajac(int start, int stop) 
{
	if (stop <= start)
		return 0;

	int wynik = porownaj() ? 1 : 0;
	for (int i = start + 1; i < stop; ++i)
	{
		int prev = SeqAt(i - 1) + 1;
		int next = SeqAt(i + sigLen - 1) + 1;

		for (int nr = 0; nr < primes; ++nr) {
			przesun(nr, i, prev, next);
		}

		if (porownaj()) {
			wynik++;
		}
	}
	return wynik;
}

void propagacjaHashSeq()
{
	if (id == 0)
	{
		for (int nr = 0; nr < primes; ++nr) {
			PutInt(1, hSeq[nr]);
		}
		Send(1);
	}
	else
	{
		int start = ((long long)id * diff / nodes) + 1;
		int startPrev = ((long long)(id - 1) * diff / nodes) + 1;
		int diffPrev = start - startPrev;

		for (int nr = 0; nr < primes; ++nr)
		{
			h1[nr] = obliczHashSeq(nr, startPrev, start, true);
			h2[nr] = obliczHashSeq(nr, startPrev + sigLen, start + sigLen, true);

			int p = pTab[nr];
			int g = gTab[nr];
			int h = hTab[nr];

			int gg = potega(g, sigLen - diffPrev, p);
			h2[nr] = ((long long)gg * h2[nr]) % p;

			h3[nr] = potega(h, diffPrev, p);
		}

		Receive(id - 1);
		for (int nr = 0; nr < primes; ++nr)
		{
			int p = pTab[nr];

			hSeq[nr] = GetInt(id - 1);

			hSeq[nr] -= h1[nr];
			if (hSeq[nr] < 0) {
				hSeq[nr] += p;
			}
			
			hSeq[nr] = ((long long)h3[nr] * hSeq[nr]) % p;

			hSeq[nr] += h2[nr];
			if (hSeq[nr] >= p) {
				hSeq[nr] -= p;
			}
		}

		if (id + 1 < nodes)
		{
			for (int nr = 0; nr < primes; ++nr) {
				PutInt(id + 1, hSeq[nr]);
			}
			Send(id + 1);
		}
	}
}

void obliczWynik()
{
	int start = ((long long)id * diff / nodes) + 1;
	int stop = ((long long)(id + 1) * diff / nodes) + 1;

	int rozmiar_max = (diff + nodes - 1) / nodes;
	if (sigLen > rozmiar_max) 
	{
		obliczHashSeq();
		propagacjaHashSeq();
	}
	else 
	{
		for (int nr = 0; nr < primes; ++nr) {
			hSeq[nr] = obliczHashSeq(nr, start, start + sigLen, true);
		}
	}

	int wynik = obliczPrzesuwajac(start, stop);
	if (id == 0) 
	{
		for (int i = 1; i < nodes; ++i)
		{
			Receive(i);
			wynik += GetInt(i);
		}
		printf("%d", wynik);
	}
	else
	{
		PutInt(0, wynik);
		Send(0);
	}
}

void init() 
{
	nodes = NumberOfNodes();
	id = MyNodeId();

	sigLen = SignalLength();
	seqLen = SeqLength();

	diff = seqLen - sigLen + 1;
	for (int nr = 0; nr < primes; ++nr) {
		gSigLen[nr] = potega(gTab[nr], sigLen, pTab[nr]);
	}
}


int main()
{
	init();
	obliczHashSig();
	obliczWynik();

    return 0;
}