Language: C++

//------------------------------------------------------------
#define MOD 1000000007

//------------------------------------------------------------
#if 1
#include <bits/stdc++.h>
using namespace std;

//------------------------------------------------------------
using ll = long long;
#define int ll

#define FOR(i, s, e) for (ll i = ll(s); i < (ll)e; ++i)
#define RFOR(i, s, e) for (ll i = ll(e) - 1; i >= ll(s); --i)
#define REP(i, n) for (ll i = 0, i##_size = n; i < i##_size; ++i)
#define RREP(i, n) for (ll i = ll(n) - 1; i >= 0; --i)

//------------------------------------------------------------
template <class T>
struct arr : public vector<T> {
	arr() {}
	arr(ll n, T v = T()) : vector<T>(n, v) {}
	void init(ll n, T v = T()) {
		this->clear();
		this->resize(n, v);
	}
	ll sz() const { return (ll)this->size(); }
	void pb(T v) { this->push_back(v); }
	void sort() { std::sort(this->begin(), this->end()); }
	void rsort() { std::sort(this->begin(), this->end(), greater<T>()); }
};
using ints = arr<ll>;
using intss = arr<arr<ll>>;

template <class T>
struct que : public queue<T> {
	ll sz() const { return (ll)this->size(); }
	T popfront() {
		T v = this->front();
		this->pop();
		return v;
	}
};

template <class A, class B>
struct pr {
	A a;
	B b;

	pr() : a(A()), b(B()) {};
	pr(A a_, B b_) : a(a_), b(b_) {}
	pr(pr const& r) : a(r.a), b(r.b) {};
	pr(pair<A, B> const& r) : a(r.first), b(r.second) {};

	bool operator == (pr const& r) const {
		return a == r.a && b == r.b;
	}
	bool operator != (pr const& r) const {
		return !((*this) == r);
	}
	bool operator < (pr const& r) const {
		if (a == r.a) {
			return b < r.b;
		}
		return a < r.a;
	}

	friend istream& operator>>(istream& is, pr& p) {
		is >> p.a >> p.b;
		return is;
	}
};
using pint = pr<ll, ll>;
using pints = arr<pint>;

template <class K, class V>
struct mp : public map<K, V> {
	void erase(const_iterator it) { map::erase(it); }
	void erase(K const& k) { map::erase(this->find(k)); }

	//iterator find(K const& k) { return map::find(k); }
	//const_iterator find(K const& k) const { return map::find(k); }

	bool get(K const& k, V* v) {
		auto it = map::find(k);
		if (it != end()) {
			*v = it->second;
			return true;
		}
		return false;
	}
};

//------------------------------------------------------------
#if defined(TEST)
extern istream& myInputStream;
extern ostream& myOutputStream;
#else
istream& myInputStream = cin;
ostream& myOutputStream = cout;
#endif

struct input {
	template <class A, class B>
	void exec(pair<A, B>& var) {
		myInputStream >> var.first >> var.second;
	}

	template <class T>
	void exec(T& var) {
		myInputStream >> var;
	}

	template <class T>
	operator T() {
		T var;
		exec(var);
		return var;
	}
} input;

struct inputs {
	ll n;
	inputs(ll n_) : n(n_) {}

	template <class T>
	operator arr<T>() {
		arr<T> var(n);
		REP(i, n) {
			var[i] = (T)input;
		};
		return var;
	}
};

template <class T>
void output(T var) {
	myOutputStream << (var) << '\n';
}

//------------------------------------------------------------
template <class T> void chmin(T& a, T b) { if (b < a) { a = b; } }
template <class T> void chmax(T& a, T b) { if (b > a) { a = b; } }

constexpr int gcd(int a, int b) {
	if (a < 0) { a = -a; }
	if (b < 0) { b = -b; }
	if (a == 0) { return b; }
	if (b == 0) { return a; }

	while (int c = a % b) {
		a = b;
		b = c;
	}
	return b;
}

//------------------------------------------------------------
struct bfs {
	ints froms;
	ints steps;

	bfs(int N, intss const& adjacency) {
		froms.init(N, -1);
		steps.init(N, -1);

		que<ll> queue;
		queue.push(0);
		froms[0] = 0;
		steps[0] = 0;

		while (queue.empty() == false) {
			ll p = queue.popfront();

			for (ll n : adjacency[p]) {
				if (froms[n] != -1) {
					continue;
				}

				froms[n] = p;
				steps[n] = steps[p] + 1;
				queue.push(n);
			}
		}
	}
};

//------------------------------------------------------------
template <int M>
struct modint {
	int raw;

	modint() { raw = 0; }
	modint(int v) {
		if (v < 0) {
			raw = (v % M) + M;
		}
		else if (v >= M) {
			raw = v % M;
		}
		else {
			raw = v;
		}
	}
	modint operator + (modint v) const { return modint(raw) += v; }
	modint operator - (modint v) const { return modint(raw) -= v; }
	modint operator * (modint v) const { return modint(raw) *= v; }

	modint& operator += (modint v) {
		raw += v.raw;
		if (raw >= M) { raw -= M; }
		return *this;
	}
	modint& operator -= (modint v) {
		raw -= v.raw;
		if (raw < 0) { raw += M; }
		return *this;
	}
	modint& operator *= (modint v) {
		raw = (raw * v.raw) % M;
		return *this;
	}
	modint pow(int n) const {
		return modint::pow(raw, n);
	}
	static modint pow(int a, int n) {
		if (n < 0) {
			// not support
			abort();
		}

		int r = 1;
		while (n) {
			if (n & 1) {
				r = (r * a) % M;
			}
			a = (a * a) % M;
			n >>= 1;
		}
		return modint(r);
	}

	friend istream& operator>>(istream& is, modint& m) {
		int v;
		is >> v;
		m = modint(v);
		return is;
	}
	friend ostream& operator<<(ostream& os, modint const& m) {
		return os << m.raw;
	}
};

using mint = modint<MOD>;
using mints = arr<mint>;

//------------------------------------------------------------
#if defined(TEST)
#include "test.hpp"
#else
void myMain();
signed main() {
	cin.tie(0);
	ios::sync_with_stdio(0);
	cout << fixed << setprecision(16);
	myMain();
	return 0;
}
#endif
#endif

//------------------------------------------------------------
void myMain() {
	int N = input;
	pints iwashis = inputs(N);

	int zeroCount = 0;
	mp<pint, int> rateCounts;
	REP(i, N) {
		pint W = iwashis[i];

		if (W.a == 0 && W.b == 0) {
			++zeroCount;
		}
		else if (W.a == 0) {
			pint rate;
			rate.a = 0;
			rate.b = 1;
			rateCounts[rate] += 1;
		}
		else if (W.b == 0) {
			pint rate;
			rate.a = 1;
			rate.b = 0;
			rateCounts[rate] += 1;
		}
		else {
			int d = gcd(abs(W.a), abs(W.b));
			pint rate;
			rate.a = W.a / d;
			rate.b = W.b / d;
			if (rate.b < 0) {
				rate.a = -rate.a;
				rate.b = -rate.b;
			}
			rateCounts[rate] += 1;
		}
	}

	//mints powTbl(N+1);
	//powTbl[0] = 1;
	//REP(i, N) {
	//	powTbl[i + 1] = (powTbl[i] * 2);
	//}

	mint ans = 1;
	while (rateCounts.size()) {
		auto const& W = rateCounts.begin();
		pint rate = W->first;
		int count = W->second;

		pint badRate(-rate.b, rate.a);
		if (badRate.a == 0) {
			badRate.b = 1;
		}
		else if (badRate.b == 0) {
			badRate.a = 1;
		}
		else if (badRate.b < 0) {
			badRate.a = -badRate.a;
			badRate.b = -badRate.b;
		}

		int badCount;
		if (rateCounts.get(badRate, &badCount)) {
			ans *= mint::pow(2, count + badCount) - (mint(2).pow(count) - 1) * (mint(2).pow(badCount) - 1);

			rateCounts.erase(rate);
			rateCounts.erase(badRate);
		}
		else {
			ans *= mint::pow(2, count);
			rateCounts.erase(rate);
		}
	}

	ans += zeroCount;
	ans -= 1;

	output(ans);
}


Compiler output:
a.cc:78:20: error: 'const_iterator' has not been declared
   78 |         void erase(const_iterator it) { map::erase(it); }
      |                    ^~~~~~~~~~~~~~
a.cc: In member function 'void mp<K, V>::erase(int)':
a.cc:78:51: error: qualified-id in declaration before '(' token
   78 |         void erase(const_iterator it) { map::erase(it); }
      |                                                   ^
a.cc: In member function 'void mp<K, V>::erase(const K&)':
a.cc:79:44: error: qualified-id in declaration before '(' token
   79 |         void erase(K const& k) { map::erase(this->find(k)); }
      |                                            ^
a.cc: In member function 'bool mp<K, V>::get(const K&, V*)':
a.cc:85:27: error: 'template<class _Key, class _Tp, class _Compare, class _Alloc> class std::map' used without template arguments
   85 |                 auto it = map::find(k);
      |                           ^~~
a.cc:86:30: error: no matching function for call to 'end()'
   86 |                 if (it != end()) {
      |                           ~~~^~
In file included from /usr/include/c++/14/bits/algorithmfwd.h:39,
                 from /usr/include/c++/14/bits/stl_algo.h:59,
                 from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:6:
/usr/include/c++/14/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   candidate expects 1 argument, 0 provided
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   candidate expects 1 argument, 0 provided
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/valarray:1249:5: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
 1249 |     end(valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1249:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/valarray:1265:5: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
 1265 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1265:5: note:   candidate expects 1 argument, 0 provided