Language: C++

#pragma gcc optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;

#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define PER(i, n) for (int i = (n-1); i >= 0; --i)
#define ALL(V) (V).begin(),(V).end()
#define SORT(V) sort(ALL(V)) //小さい方からソート
#define REV(V) reverse(ALL(V)) //リバース
#define RSORT(V) SORT(V);REV(V) //大きい方からソート
#define NEXP(V) next_permutation(ALL(V)) //順列
#define pb(n) push_back(n)
#define popb(n) pop_back(n)
#define endl '\n'
#define Endl '\n'
#define DUMP(x)  cout << #x << " = " << (x) << endl
#define YES(n) cout << ((n) ? "YES" : "NO"  ) << endl
#define Yes(n) cout << ((n) ? "Yes" : "No"  ) << endl
#define yes(n) cout << ((n) ? "yes" : "no"  ) << endl
#define Yay(n) cout << ((n) ? "Yay!": ":(") << endl
#define VSUM(V) accumulate(ALL(V), 0)
#define MID(a,b,c) (a) < (b) && (b) < (c)
#define MIDe(a,b,c) (a) <= (b) && (b) <= (c)
#define IN(n) cin >> n
#define IN2(a,b) cin >> a >> b
#define IN3(a,b,c) cin >> a >> b >> c 
#define IN4(a,b,c,d) cin >> a >> b >> c >> d
#define VIN(V) for(int i = 0; i < (V).size(); i++) {cin >> (V).at(i);}
#define OUT(n) cout << n << endl
#define VOUT(V) REP(i, (V).size()) {cout << (V)[i] << endl;}
#define VOUT2(V) REP(i, (V).size()) {if((V).size()-1!=i){cout << (V)[i] << " ";}else{cout << (V)[i] << endl;}}

#define int long long
#define P pair<ll,ll>
#define Vi vector<ll>
#define VVi vector<vector<ll>>
#define Vd vector<double>
#define Vb vector<bool>
#define Vs vector<string>
#define Vc vector<char>
#define M map<ll,ll>
#define S set<ll>
#define PQ priority_queue<ll>
#define PQG priority_queue<ll,V,greater<ll>

using ll = long long;
using Graph = vector<vector<int>>;

const int MOD = 1000000007;
const int INF = 1061109567;
const double EPS = 1e-10;
const double PI  = acos(-1.0);
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

struct UnionFind {
  vector<int> par;

  UnionFind(int n) : par(n) {
    for(int i = 0; i < n; ++i) par[i] = i;
  }

  int root(int x) {
    if(par[x] == x) return x;
    return par[x] = root(par[x]);
  }

  void unite(int x, int y) {
    int rx = root(x);
    int ry = root(y);
    if(rx == ry) return;
    par[rx] = ry;
  }

  bool same(int x, int y) {
    int rx = root(x);
    int ry = root(y);
    return rx == ry;
  }
};

int gcd(int a, int b) {
  return b != 0 ? gcd(b, a % b) : a;
}

int lcm(int a, int b) {
  return a * b / gcd(a, b);
}

// 文字を全て大文字にします
string toStrUp(string str) {
  char diff = 'A'-'a';
  REP(i,str.size()) str[i] += diff;
  return str;
}

// 文字をstring型で一文字取得します
string get1ch(string str, int key) {
  return str.substr(key,1);
}

// 素因数分解 (O(sqrt(n)))
map<int,int> prime_factor(int n) {
  map<int,int> ret;
  for(int i = 2; i * i <= n; i++) {
    while(n % i == 0) {
      ret[i]++;
      n /= i;
    }
  }
  if(n != 1) ret[n] = 1;
  return ret;
}

// 素数判定 (O(sqrt(n)))
bool is_prime(int x) {
  for(int i = 2; i * i <= x; i++) {
    if(x % i == 0) return false;
  }
  return true;
}

// 進数変換 (O(log n))
template<typename T>
vector<T> convert_base(T x, T b) {
  vector< T > ret;
  T t = 1, k = abs(b);
  while(x) {
    ret.emplace_back((x * t) % k);
    if(ret.back() < 0) ret.back() += k;
    x -= ret.back() * t;
    x /= k;
    t *= b / k;
  }
  if(ret.empty()) ret.emplace_back(0);
  reverse(begin(ret), end(ret));
  return ret;
}

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;
}

signed main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);

  // デフォルト変数定義
  int n=0,m=0,a=0,b=0,c=0,d=0,x=0,y=0,z=0;
  string s="",t="";
  //

  // ここから
  IN(n);
  vector<int> d(n), c(n);
  for (int i = 0; i < n; ++i) {
      cin >> d[i];
      if (i > 0 && d[i] == 0) {
          cout << 0 << endl;
          return 0;
      }
      ++c[d[i]];
  }
  int ans = 1;
  for (int i = 1; i < n; ++i)
      for (int j = 0; j < c[i]; ++j)
          ans = 1LL * ans * c[i - 1] % P;
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:169:15: error: conflicting declaration 'std::vector<long long int> d'
  169 |   vector<int> d(n), c(n);
      |               ^
a.cc:163:27: note: previous declaration as 'long long int d'
  163 |   int n=0,m=0,a=0,b=0,c=0,d=0,x=0,y=0,z=0;
      |                           ^
a.cc:169:21: error: conflicting declaration 'std::vector<long long int> c'
  169 |   vector<int> d(n), c(n);
      |                     ^
a.cc:163:23: note: previous declaration as 'long long int c'
  163 |   int n=0,m=0,a=0,b=0,c=0,d=0,x=0,y=0,z=0;
      |                       ^
a.cc:171:15: error: invalid types 'long long int[long long int]' for array subscript
  171 |       cin >> d[i];
      |               ^
a.cc:172:21: error: invalid types 'long long int[long long int]' for array subscript
  172 |       if (i > 0 && d[i] == 0) {
      |                     ^
a.cc:176:12: error: invalid types 'long long int[long long int]' for array subscript
  176 |       ++c[d[i]];
      |            ^
a.cc:180:28: error: invalid types 'long long int[long long int]' for array subscript
  180 |       for (int j = 0; j < c[i]; ++j)
      |                            ^
a.cc:181:30: error: invalid types 'long long int[long long int]' for array subscript
  181 |           ans = 1LL * ans * c[i - 1] % P;
      |                              ^
a.cc:181:41: error: expected primary-expression before ';' token
  181 |           ans = 1LL * ans * c[i - 1] % P;
      |                                         ^