Language: C++

#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <vector>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <queue>
#include <numeric>
#include <random>
#include <algorithm>
#include <functional>
#include <cassert>

using namespace std;
typedef long long ll;

template<class T> inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template<class T> inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

const int INF = (1 << 30) - 1;
const ll INFLL= (1LL << 61) - 1;
const int MOD = 1000000007;
#define ALL(a) (a).begin(),(a).end()
#define rALL(a) (a).rbegin(),(a).rend()
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)

template<int Modulo = MOD>
struct Mint {
	ll val;
	constexpr Mint(ll v = 0) noexcept : val(v % Modulo) { if (val < 0) val += Modulo; }

	constexpr Mint& operator += (const Mint &r) noexcept {
		val += r.val;
		if (val >= Modulo) val -= Modulo;
		return *this;
	}
	constexpr Mint& operator -= (const Mint &r) noexcept {
		val -= r.val;
		if (val < 0) val += Modulo;
		return *this;
	}
	constexpr Mint& operator *= (const Mint &r) noexcept {
		val = val * r.val % Modulo;
		return *this;
	}
	constexpr Mint& operator /= (const Mint &r) noexcept {
		ll a = r.val, b = Modulo, u = 1, v = 0;
		while (b) {
			ll t = a / b;
			a -= t * b; swap(a, b);
			u -= t * v; swap(u, v);
		}
		val = val * u % Modulo;
		if (val < 0) val += Modulo;
		return *this;
	}

	constexpr Mint operator + (const Mint &r) const noexcept { return Mint(*this) += r; }
	constexpr Mint operator - (const Mint &r) const noexcept { return Mint(*this) -= r; }
	constexpr Mint operator * (const Mint &r) const noexcept { return Mint(*this) *= r; }
	constexpr Mint operator / (const Mint &r) const noexcept { return Mint(*this) /= r; }

	constexpr int getmod() { return Modulo; }
	constexpr Mint operator - () const noexcept { return val ? Modulo - val : 0; }

	constexpr bool operator == (const Mint &r) const noexcept { return val == r.val; }
	constexpr bool operator != (const Mint &r) const noexcept { return val != r.val; }

	friend ostream &operator << (ostream &os, const Mint<Modulo> &x) noexcept { return os << x.val; }
	friend istream &operator >> (istream &is, Mint<Modulo> &x) noexcept {
		ll tmp; is >> tmp;
		x = Mint(tmp);
		return is;
	}

	constexpr Mint pow(ll n) noexcept {
		Mint res{ 1 }, tmp{ val };
		while (n > 0) {
			if (n & 1) res *= tmp;
			tmp *= tmp;
			n >>= 1;
		}
		return res;
	}
};
using mint = Mint<>;

ll gcd(ll a,ll b){
  if (a%b==0){
    return(b);
  }
  else{
    return(gcd(b,a%b));
  }
}

int main(){
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  ll N;
  cin>>N;
  map<pair<ll,ll>,ll> mp;
  REP(i,N){
    ll A,B;
    cin>>A>>B;
    if(A==0 && B==0){
      mp[{0,0}]++;
    }else{
      ll g=abs(gcd(A,B));
      A/=g;B/=g;
      if(A<0){
        A*=-1;B*=-1;
      }
      if(A==0&&B<0){
        B*=-1;
      }
      mp[{A,B}]++;
    }
  }

  mint ans=1;
  for(auto e:mp){
    ll a=e.first.first,b=e.first.second;
    auto it = mp.find({b, -a});
    if(it != mp.end()){
      ans *= (mint(2).pow(e.second) + mint(2).pow() -1 );
    }else{
      if(mp.count({-b,a})==0){
        ans *= (mint(2).pow(e.second));
      }
    }
  }

  cout<<ans+mp[{0,0}]-1<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:142:50: error: no matching function for call to 'Mint<>::pow()'
  142 |       ans *= (mint(2).pow(e.second) + mint(2).pow() -1 );
      |                                       ~~~~~~~~~~~^~
a.cc:92:24: note: candidate: 'constexpr Mint<Modulo> Mint<Modulo>::pow(ll) [with int Modulo = 1000000007; ll = long long int]'
   92 |         constexpr Mint pow(ll n) noexcept {
      |                        ^~~
a.cc:92:24: note:   candidate expects 1 argument, 0 provided