Problem p02574 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
typedef long long ll;
#define endl "\n"
#define all(s) s.begin(), s.end()
#define pb push_back
#define uno unordered_map
#define pi 3.1415926536
#define dig(a) fixed << setprecision(a)
#define test(zz)                                                               \
  int zz;                                                                      \
  cin >> zz;                                                                   \
  while (zz--)
#define foreach(var, i) for (auto i = var.begin(); i != var.end(); i++)
#define fast()                                                                 \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);
ll power(ll a, ll n) {
  ll res = 1;
  while (n) {
    if (n % 2) {
      res *= a;
    }
    n >>= 1;
    a *= a;
  }
  return res;
}
ll powerm(ll a, ll n, ll m) {
  ll res = 1;
  while (n) {
    if (n % 2) {
      res = (res * a) % m;
    }
    n >>= 1;
    a = (a * a) % m;
  }
  return res;
}
using namespace std;

const int M = 1e9 + 7;
ll mod(ll x) { return ((x % M + M) % M); }
ll add(ll a, ll b) { return mod(mod(a) + mod(b)); }
ll mul(ll a, ll b) { return mod(mod(a) * mod(b)); }
const int N = 100005;

int main() {
  fast();
  // test(t){}

  int n;
  cin >> n;
  vector<int> a(n), fact(N);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    fact[a[i]]++;
  }

  bool f = true;
  for (int i = 2; i < N; i++) {
    int c = 0;
    for (int j = i; j < N; j += i) {
      c += fact[j];
    }
    if (c > 1) {
      f = false;
      break;
    }
  }
  if (f) {
    cout << "pairwise coprime" << endl;
    return 0;
  }
  int g = 0;
  for (int i = 0; i < n; i++) {
    g = __gcd(g, a[i]);
  }
  if (g == 1) {
    cout << "setwise coprime" << endl;
    return 0;
  }
  cout << "not coprime" << endl;

  return 0;
}


Fixed submission:
#include <bits/stdc++.h>
typedef long long ll;
#define endl "\n"
#define all(s) s.begin(), s.end()
#define pb push_back
#define uno unordered_map
#define pi 3.1415926536
#define dig(a) fixed << setprecision(a)
#define test(zz)                                                               \
  int zz;                                                                      \
  cin >> zz;                                                                   \
  while (zz--)
#define foreach(var, i) for (auto i = var.begin(); i != var.end(); i++)
#define fast()                                                                 \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);
ll power(ll a, ll n) {
  ll res = 1;
  while (n) {
    if (n % 2) {
      res *= a;
    }
    n >>= 1;
    a *= a;
  }
  return res;
}
ll powerm(ll a, ll n, ll m) {
  ll res = 1;
  while (n) {
    if (n % 2) {
      res = (res * a) % m;
    }
    n >>= 1;
    a = (a * a) % m;
  }
  return res;
}
using namespace std;

const int M = 1e9 + 7;
ll mod(ll x) { return ((x % M + M) % M); }
ll add(ll a, ll b) { return mod(mod(a) + mod(b)); }
ll mul(ll a, ll b) { return mod(mod(a) * mod(b)); }
const int N = 1000005;

int main() {
  fast();
  // test(t){}

  int n;
  cin >> n;
  vector<int> a(n), fact(N);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    fact[a[i]]++;
  }

  bool f = true;
  for (int i = 2; i < N; i++) {
    int c = 0;
    for (int j = i; j < N; j += i) {
      c += fact[j];
    }
    if (c > 1) {
      f = false;
      break;
    }
  }
  if (f) {
    cout << "pairwise coprime" << endl;
    return 0;
  }
  int g = 0;
  for (int i = 0; i < n; i++) {
    g = __gcd(g, a[i]);
  }
  if (g == 1) {
    cout << "setwise coprime" << endl;
    return 0;
  }
  cout << "not coprime" << endl;

  return 0;
}