This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
using namespace std;
namespace debug { template <class c> struct rge { c b, e; }; template <class c> rge<c> range(c i, c j) { return rge<c>{i, j}; } template <class c> char spk(...); template <class c> auto spk(c* a) -> decltype(cerr << *a, 0); struct stream { ~stream() { cerr << endl; } template <class c> typename enable_if <sizeof spk<c>(0) != 1, stream&>::type operator<<(c i) { cerr << boolalpha << i; return *this; } template <class c> typename enable_if <sizeof spk<c>(0) == 1, stream&>::type operator<<(c i) { return *this << range(begin(i), end(i)); } template <class a, class b> stream& operator<<(pair <a,b> p) { return *this << "(" << p.first << ", " << p.second << ")"; } template <class c> stream& operator<<(rge<c> d) { *this << "["; for (auto it=d.b; it!=d.e; it++) *this << ", " + 2 * (it == d.b) << *it; return *this << "]"; } stream& _dbg(const string& s, int i, int b) { return *this; } template <class c, class ... cs> stream& _dbg(const string& s, int i, int b, c arg, cs ... args) { if (i == (int)(s.size())) return (*this << ": " << arg); b += (s[i] == '(') + (s[i] == '[') + (s[i] == '{') - (s[i] == ')') - (s[i] == ']') - (s[i] == '}'); return (s[i] == ',' && b == 0) ? (*this << ": " << arg << " ")._dbg(s, i + 1, b, args...) : (s[i] == ' ' ? *this : *this << s[i])._dbg(s, i + 1, b, arg, args...); } };}
#define dout debug::stream()
#define dbg(...) ((dout << ">> ")._dbg(#__VA_ARGS__, 0, 0, __VA_ARGS__))
#define f first
#define s second
#define mp make_pair
#define pb push_back
#define all(x) x.begin(),x.end()
#define ss(x) ((int)((x).size()))
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define per(i,a,b) for(int i=(b);i>=(a);i--)
#define upgrade cin.tie(0)->sync_with_stdio(0);
template <class p, class q> pair<p,q> operator-(pair<p,q> a, pair<p,q> b) { return mp(a.f - b.f, a.s - b.s); }
template <class p, class q> pair<p,q> operator+(pair<p,q> a, pair<p,q> b) { return mp(a.f + b.f, a.s + b.s); }
template <class p, class q> void umin(p &a, const q &b) { if (a > b) a = b; }
template <class p, class q> void umax(p &a, const q &b) { if (a < b) a = b; }
using lf = long double;
using ll = long long;
using cll = const ll;
using cint = const int;
bool check(ll d, vector <ll>& vec)
{
for (ll m : vec){
if (m % d == 0){
return false;
}
}
return true;
}
int main()
{
ll N;
int k;
scanf("%lld%d", &N, &k);
vector <ll> m(k);
for (ll& x : m) scanf("%lld", &x);
ll n = __gcd(N, m.back());
m.pop_back();
for (ll& x : m) x = __gcd(x, n);
//sort(all(m));
//m.erase(unique(all(m)), m.end());
//reverse(all(m));
vector <ll> divs;
for (ll i = 1; i * i <= n; i++){
if (n % i != 0) continue;
divs.pb(i);
if (i * i < n) divs.pb(n / i);
}
sort(all(divs));
// dbg(n, divs);
for (ll d : divs){
if (check(d, m) == true){
printf("%lld\n", N / d);
return 0;
}
}
assert(false);
}
Compilation message (stderr)
sej.cpp: In function 'int main()':
sej.cpp:43:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
43 | scanf("%lld%d", &N, &k);
| ~~~~~^~~~~~~~~~~~~~~~~~
sej.cpp:47:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
47 | for (ll& x : m) scanf("%lld", &x);
| ~~~~~^~~~~~~~~~~~
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