Problem p02574 (C++) — buggy submission, verdict: Time Limit Exceeded

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define _DEBUG
#include "bits/stdc++.h"
#define CHOOSE(a) CHOOSE2 a
#define CHOOSE2(a0, a1, a2, a3, a4, x, ...) x
#define debug_1(x1) cout << #x1 << ": " << x1 << endl
#define debug_2(x1, x2)                                                        \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << endl
#define debug_3(x1, x2, x3)                                                    \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << ", " #x3 << ": "      \\
       << x3 << endl
#define debug_4(x1, x2, x3, x4)                                                \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << ", " #x3 << ": "      \\
       << x3 << ", " #x4 << ": " << x4 << endl
#define debug_5(x1, x2, x3, x4, x5)                                            \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << ", " #x3 << ": "      \\
       << x3 << ", " #x4 << ": " << x4 << ", " #x5 << ": " << x5 << endl
#ifdef _DEBUG
#define debug(...)                                                             \\
  CHOOSE((__VA_ARGS__, debug_5, debug_4, debug_3, debug_2, debug_1, ~))        \\
  (__VA_ARGS__)
#else
#define debug(...)
#endif
#define rep(index, num) for (int index = 0; index < (int)num; index++)
#define rep1(index, num) for (int index = 1; index <= (int)num; index++)
#define brep(index, num) for (int index = (int)num - 1; index >= 0; index--)
#define brep1(index, num) for (int index = (int)num; index > 0; index--)
#define scan(argument) cin >> argument
#define prin(argument) cout << argument << endl
#define kaigyo cout << endl
#define eps 1e-7
#define mp(a1, a2) make_pair(a1, a2)
#define ALL(a) (a).begin(), (a).end()
#define rALL(a) (a).rbegin(), (a).rend()
typedef long long ll;
typedef long double ld;
using namespace std;
typedef pair<ll, ll> pll;
typedef pair<int, int> pint;
typedef vector<int> vint;
typedef vector<ll> vll;
typedef vector<pint> vpint;
typedef vector<pll> vpll;
ll INFl = (ll)1e+18 + 1;
int INF = 1e+9 + 1;
int A[1000001];
int insu[1000001] = {};
bool prime_factor_decomp(ll n) {
  ll m = n;
  for (ll i = 2; i * i <= n; i++) {
    if (m % i != 0)
      continue;
    int c = 0;
    while (m % i == 0)
      c++, m /= i;
    insu[i]++;
    if (insu[i] >= 2)
      return 0;
    // e.push_back(c);
  }
  if (m > 1) {
    insu[m]++;
    if (insu[m] >= 2)
      return 0;
    // e.push_back(1);
  }
  return 1;
  // return mp(p, e);
}
ll gcd(ll x, ll y) {
  if (y == 0)
    return x;
  return gcd(y, x % y);
}
int main() {
  int N;
  scan(N);
  rep(i, N) scan(A[i]);
  bool flag = 1;
  rep(i, N) {
    if (A[i] != 1) {
      bool f = prime_factor_decomp(A[i]);
      if (f == 0) {
        flag = 0;
        break;
      }
    }
  }
  if (flag) {
    prin("pairwise coprime");
  } else {
    int g = 0;
    rep(i, N) g = gcd(g, A[i]);
    if (g == 1)
      prin("setwise coprime");
    else
      prin("not coprime");
  }
  return 0;
}


Error: TLE

Fixed submission:

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define _DEBUG
#include "bits/stdc++.h"
#define CHOOSE(a) CHOOSE2 a
#define CHOOSE2(a0, a1, a2, a3, a4, x, ...) x
#define debug_1(x1) cout << #x1 << ": " << x1 << endl
#define debug_2(x1, x2)                                                        \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << endl
#define debug_3(x1, x2, x3)                                                    \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << ", " #x3 << ": "      \\
       << x3 << endl
#define debug_4(x1, x2, x3, x4)                                                \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << ", " #x3 << ": "      \\
       << x3 << ", " #x4 << ": " << x4 << endl
#define debug_5(x1, x2, x3, x4, x5)                                            \\
  cout << #x1 << ": " << x1 << ", " #x2 << ": " << x2 << ", " #x3 << ": "      \\
       << x3 << ", " #x4 << ": " << x4 << ", " #x5 << ": " << x5 << endl
#ifdef _DEBUG
#define debug(...)                                                             \\
  CHOOSE((__VA_ARGS__, debug_5, debug_4, debug_3, debug_2, debug_1, ~))        \\
  (__VA_ARGS__)
#else
#define debug(...)
#endif
#define rep(index, num) for (int index = 0; index < (int)num; index++)
#define rep1(index, num) for (int index = 1; index <= (int)num; index++)
#define brep(index, num) for (int index = (int)num - 1; index >= 0; index--)
#define brep1(index, num) for (int index = (int)num; index > 0; index--)
#define scan(argument) cin >> argument
#define prin(argument) cout << argument << endl
#define kaigyo cout << endl
#define eps 1e-7
#define mp(a1, a2) make_pair(a1, a2)
#define ALL(a) (a).begin(), (a).end()
#define rALL(a) (a).rbegin(), (a).rend()
typedef long long ll;
typedef long double ld;
using namespace std;
typedef pair<ll, ll> pll;
typedef pair<int, int> pint;
typedef vector<int> vint;
typedef vector<ll> vll;
typedef vector<pint> vpint;
typedef vector<pll> vpll;
ll INFl = (ll)1e+18 + 1;
int INF = 1e+9 + 1;
int A[1000001];
int insu[1000001] = {};
void prime_factor_decomp(ll n) {
  ll m = n;
  for (ll i = 2; i * i <= n; i++) {
    if (m % i != 0)
      continue;
    int c = 0;
    while (m % i == 0)
      c++, m /= i;
    insu[i]++;
    // e.push_back(c);
  }
  if (m > 1) {
    insu[m]++;
    // e.push_back(1);
  }
  // return mp(p, e);
}
ll gcd(ll x, ll y) {
  if (y == 0)
    return x;
  return gcd(y, x % y);
}
int main() {
  int N;
  scan(N);
  rep(i, N) scan(A[i]);
  rep(i, N) {
    if (A[i] != 1) {
      prime_factor_decomp(A[i]);
    }
  }
  bool flag = 1;
  rep1(i, 1000000) {
    if (insu[i] >= 2) {
      flag = 0;
      break;
    }
  }
  if (flag) {
    prin("pairwise coprime");
  } else {
    int g = 0;
    rep(i, N) g = gcd(g, A[i]);
    if (g == 1)
      prin("setwise coprime");
    else
      prin("not coprime");
  }
  return 0;
}