Language: C++

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

using VS = vector<string>;    using LL = long long;
using VI = vector<int>;       using VVI = vector<VI>;
using PII = pair<int, int>;   using PLL = pair<LL, LL>;
using VL = vector<LL>;        using VVL = vector<VL>;

#define ALL(a)  begin((a)),end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define SZ(a) int((a).size())
#define SORT(c) sort(ALL((c)))
#define RSORT(c) sort(RALL((c)))
#define UNIQ(c) (c).erase(unique(ALL((c))), end((c)))
#define FOR(i, s, e) for (int(i) = (s); (i) < (e); (i)++)
#define FORR(i, s, e) for (int(i) = (s); (i) > (e); (i)--)
//#pragma GCC optimize ("-O3") 
#ifdef YANG33
#include "mydebug.hpp"
#else
#define DD(x) 
#endif
const int INF = 1e9;                          const LL LINF = 1e16;
const LL MOD = 1000000007;                    const double PI = acos(-1.0);

/* -----  2019/06/01  Problem: M-Solutions2019 E / Link: https://atcoder.jp/contests/m-solutions2019  ----- */
template <::std::uint_fast32_t MODULO> class modint {
public:
	using uint32 = ::std::uint_fast32_t; using uint64 = ::std::uint_fast64_t; using value_type = uint32; uint32 a; modint() noexcept : a(0) {}modint(long long x)noexcept :a(x%MODULO) {}	modint operator+(const modint &o) const noexcept { return a + o.a < MODULO ? modint(a + o.a) : modint(a + o.a - MODULO); }modint operator-(const modint &o) const noexcept { return modint(a < o.a ? a + MODULO - o.a : a - o.a); }modint operator*(const modint &o) const noexcept { return modint(static_cast<uint64>(a) * o.a % MODULO); }modint operator/(const modint &o) const { return modint(static_cast<uint64>(a) * (~o).a % MODULO); }modint &operator+=(const modint &o) noexcept { return *this = *this + o; }modint &operator-=(const modint &o) noexcept { return *this = *this - o; }modint &operator*=(const modint &o) noexcept { return *this = *this * o; }modint &operator/=(const modint &o) { return *this = *this / o; }modint operator~() const noexcept { return pow(MODULO - 2); }modint operator-() const noexcept { return a ? modint(MODULO - a) : *this; }modint operator++() noexcept { return a == MODULO - 1 ? a = 0 : ++a, *this; }modint operator--() noexcept { return a ? --a : a = MODULO - 1, *this; }bool operator==(const modint &o) const noexcept { return a == o.a; }bool operator!=(const modint &o) const noexcept { return a != o.a; }bool operator<(const modint &o) const noexcept { return a < o.a; }bool operator<=(const modint &o) const noexcept { return a <= o.a; }bool operator>(const modint &o) const noexcept { return a > o.a; }bool operator>=(const modint &o) const noexcept { return a >= o.a; }explicit operator bool() const noexcept { return a; }explicit operator uint32() const noexcept { return a; }modint pow(uint32 x) const noexcept { uint64 t = a, u = 1; while (x) { if (x & 1)u = u * t % MODULO; t = (t * t) % MODULO; x >>= 1; }	return modint(u); }
	uint32 get() const noexcept { return a; }
};
const int MOD = 1000003;
using mint = modint<MOD>;
vector<mint> fact;

mint mini(mint x, int n) {
	if ((LL)x.get() + n - 1 >= MOD)return mint(0);
	if (x.get() == 0) {
		return fact[(x.get() + n - 1)];
	}
	return fact[(x.get() + n - 1)] / fact[x.get() - 1];
}

mint calc(int x, int d, int n) {
	mint y = mint(x) / mint(d);
	mint ret = mint(d).pow(n);
	ret *= mini(y, n);
	return ret;
}

void init_fact(int n) {
	fact.resize(n); fact[0] = 1;
	for (int i = 1; i < n; i++) {
		fact[i] = fact[i - 1] * mint(i);
	}
}

// factor: MOD : MOD
// LOCAL CHECK!!
int main() {
	init_fact(30000000);
	int Q; cin >> Q;
	FOR(_, 0, Q) {
		int x, d, n; cin >> x >> d >> n;
		if (x&&d) {
			cout << calc(x, d, n).get() << endl;
		}
		else if (x == 0) {
			cout << 0 << endl;
		}
		else  if (d == 0) {
			cout << mint(x).pow(n).get() << endl;
		}
	}

}


Compiler output:
a.cc:32:11: error: conflicting declaration 'const int MOD'
   32 | const int MOD = 1000003;
      |           ^~~
a.cc:24:10: note: previous declaration as 'const LL MOD'
   24 | const LL MOD = 1000000007;                    const double PI = acos(-1.0);
      |          ^~~