Language: C++

#define _CRT_SECURE_NO_WARNINGS
#pragma target("avx")
#pragma optimize("O3")
#pragma optimize("unroll-loops")
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define rep(i,n) for(int i=0;i<(lint)(n);i++)
#define REP(i,n) for(int i=1;i<=(lint)(n);i++)
#define all(V) V.begin(),V.end()
#define int long long
typedef long long lint;
typedef std::pair<lint, lint> P;
constexpr int INF = INT_MAX/2;
constexpr lint LINF = LLONG_MAX/2;
constexpr double eps = 1e-9;
template<class T>
class prique :public std::priority_queue<T, std::vector<T>, std::greater<T>> {};
template <class T, class U>
inline bool chmax(T& lhs, const U& rhs) {
	if (lhs < rhs) {
		lhs = rhs;
		return 1;
	}
	return 0;
}
template <class T, class U>
inline bool chmin(T& lhs, const U& rhs) {
	if (lhs > rhs) {
		lhs = rhs;
		return 1;
	}
	return 0;
}
inline lint gcd(lint a, lint b) {
	while (b) {
		lint c = a;
		a = b; b = c % b;
	}
	return a;
}
inline lint lcm(lint a, lint b) {
	return a / gcd(a, b) * b;
}
bool isprime(lint n) {
	if (n == 1)return false;
	for (int i = 2; i * i <= n; i++) {
		if (n % i == 0)return false;
	}
	return true;
}
lint mypow(lint a, lint b) {
	if (!b)return 1;
	if (b & 1)return mypow(a, b - 1) * a;
	lint memo = mypow(a, b >> 1);
	return memo * memo;
}
lint modpow(lint a, lint b, lint m) {
	if (!b)return 1;
	if (b & 1)return modpow(a, b - 1, m) * a % m;
	lint memo = modpow(a, b >> 1, m);
	return memo * memo % m;
}
template<typename T>
void printArray(std::vector<T>& vec) {
	rep(i, vec.size() - 1)std::cout << vec[i] << " ";
	std::cout << vec.back() << std::endl;
}
template<typename T>
void printArray(T l, T r) {
	T rprev = r;
	rprev--;
	for (T i = l; i != rprev; i++) {
		std::cout << *i << " ";
	}
	std::cout << *rprev << std::endl;
}
std::string to_string(std::vector<int>& vec) {
	std::string res = "[";
	rep(i, vec.size() - 1)res += std::to_string(vec[i]) + ", ";
	res += std::to_string(vec.back()) + "]";
	return res;
}
class Rational {
public:
	lint num, den;
	Rational() :num(0), den(1) {}
	Rational(lint p) :num(p), den(1) {}
	Rational(lint p, lint q) :num(p), den(q) {
		reduce();
	}
	void reduce() {
		if (den < 0) {
			num = -num; den = -den;
		}
		if (num == 0)den = 1;
		else {
			lint r = std::gcd(abs(num), abs(den));
			num /= r; den /= r;
		}
	}
	inline bool operator<(const Rational& rhs)const {
		return num * rhs.den < rhs.num* den;
	}
	inline bool operator==(const Rational& rhs)const {
		return num * rhs.den == rhs.num * den;
	}
	inline bool operator>(const Rational& rhs)const {
		return num * rhs.den > rhs.num * den;
	}
	inline Rational& operator+=(Rational rhs) {
		lint r = lcm(this->den, rhs.den);
		num *= r / this->den;
		rhs.num *= r / rhs.den;
		den = rhs.den = r;
		num += rhs.num;
		reduce();
		return *this;
	}
	inline Rational operator-() {
		return Rational(-num, den);
	}
	inline Rational& operator-=(Rational rhs) {
		lint r = lcm(this->den, rhs.den);
		num *= r / this->den;
		rhs.num *= r / rhs.den;
		den = rhs.den = r;
		num -= rhs.num;
		reduce();
		return *this;
	}
	inline Rational& operator*=(const Rational& rhs) {
		num *= rhs.num;
		den *= rhs.den;
		reduce();
		return *this;
	}
	inline Rational& operator/=(const Rational& rhs) {
		num *= rhs.den;
		den *= rhs.num;
		reduce();
		return *this;
	}
	template<typename T> Rational operator+(const T& rhs)const { return Rational(*this) += rhs; }
	template<typename T> Rational& operator+=(const T& rhs) { return operator+=(Rational(rhs)); }
	template<typename T> Rational operator-(const T& rhs)const { return Rational(*this) -= rhs; }
	template<typename T> Rational& operator-=(const T& rhs) { return operator-=(Rational(rhs)); }
	template<typename T> Rational operator*(const T& rhs)const { return Rational(*this) *= rhs; }
	template<typename T> Rational& operator*=(const T& rhs) { return operator*=(Rational(rhs)); }
	template<typename T> Rational operator/(const T& rhs)const { return Rational(*this) /= rhs; }
	template<typename T> Rational& operator/=(const T& rhs) { return operator/=(Rational(rhs)); }

	Rational inv() const{
		return Rational(den,num);
	}
};
std::ostream& operator<<(std::ostream& ofs, const Rational& x) {
	ofs << x.num << "/" << x.den;
	return ofs;
}
template<unsigned int modulo = 1000000007>
class ModInt {
	lint value;
public:
	ModInt() : value(0) {}
	template<typename T>
	ModInt(T value = 0) : value(value) {
		if (value < 0)value = -(lint)(-value % modulo) + modulo;
		this->value = value % modulo;
	}
	inline operator lint()const { return value; }
	inline ModInt& operator+=(const ModInt& x) {
		value += x.value;
		if (value >= modulo)value -= modulo;
		return *this;
	}
	inline ModInt& operator++() {
		if (value == modulo - 1)value = 0;
		else value++;
		return *this;
	}
	inline ModInt operator-()const {
		return ModInt(0) -= *this;
	}
	inline ModInt& operator-=(const ModInt& x) {
		value -= x.value;
		if (value < 0)value += modulo;
		return *this;
	}
	inline ModInt& operator--() {
		if (value == 0)value = modulo - 1;
		else value--;
		return *this;
	}
	inline ModInt& operator*=(const ModInt& x) {
		value = value * x.value % modulo;
		return *this;
	}
	inline ModInt& operator/=(ModInt rhs) {
		int exp = modulo - 2;
		while (exp) {
			if (exp & 1)*this *= rhs;
			rhs *= rhs;
			exp >>= 1;
		}
		return *this;
	}
	template<typename T> ModInt operator+(const T& rhs)const { return ModInt(*this) += rhs; }
	template<typename T> ModInt& operator+=(const T& rhs) { return operator+=(ModInt(rhs)); }
	template<typename T> ModInt operator-(const T& rhs)const { return ModInt(*this) -= rhs; }
	template<typename T> ModInt& operator-=(const T& rhs) { return operator-=(ModInt(rhs)); }
	template<typename T> ModInt operator*(const T& rhs)const { return ModInt(*this) *= rhs; }
	template<typename T> ModInt& operator*=(const T& rhs) { return operator*=(ModInt(rhs)); }
	template<typename T> ModInt operator/(const T& rhs)const { return ModInt(*this) /= rhs; }
	template<typename T> ModInt& operator/=(const T& rhs) { return operator/=(ModInt(rhs)); }
};
template<unsigned int T>
std::istream& operator>>(std::istream& ist, ModInt<T>& x) {
	lint a;
	ist >> a;
	x = a;
	return ist;
}
int n;
int a0,b0,both0;
std::map<Rational,int> mp;
std::set<Rational> d;
signed main(){
	std::cin>>n;
	rep(i,n){
		lint a,b;
		std::cin>>a>>b;
		if(a==0&&b==0)both0++;
		else if(a==0)a0++;
		else if(b==0)b0++;
		else mp[Rational(a,b)]++;
	}
	lint ans=1;
	for(auto ite=mp.begin();ite!=mp.end();ite++){
		if(d.find((*ite).first)!=d.end())continue;
		if(mp.find(-(*ite).first.inv())==mp.end()){
			ans*=modpow(2,(*ite).second,1000000007);
			ans%=1000000007;
		}
		else{
			ans*=(modpow(2,(*ite).second,1000000007)+modpow(2,mp[-((*ite).first.inv())],1000000007)-1);
			ans%=1000000007;
			d.insert((*ite).second);
			d.insert(-((*ite).first.inv()));
		}
	}
	ans*=modpow(2,a0,1000000007)+modpow(2,b0,1000000007)-1;
	ans%=1000000007;
	ans+=both0-1;
	if(ans<0)ans+=1000000007;
	ans%=mod;
	std::cout<<ans<<std::endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:279:14: error: 'mod' was not declared in this scope; did you mean 'modf'?
  279 |         ans%=mod;
      |              ^~~
      |              modf