Language: C++

#include<iostream>
#include<algorithm>
#include<vector>
#include<set>
#define int long long
#define mod 1000000007
using namespace std;
int n, m;
int pt[123456], a[123456], ans;
set<int>s; vector<int>v[123456], v1;
void f() {
	for (int i = 0; i < n; i++)pt[i] = i;
	return;
}
int root(int i) {
	if (pt[i] == i)return i;
	else return pt[i] = root(pt[i]);
}
void unite(int a, int b) {
	pt[root(b)] = root(a);
	root(b);
	return;
}
signed main() {
	cin >> n >> m;
	if ((n - 1 - m) * 2 > n) {
		cout << "Impossible\n";
		return 0;
	}
	if (n - 1 == m) {
		cout << "0\n";
		return 0;
	}
	f();
	for (int i = 0; i < n; i++)cin >> a[i];
	for (int i = 0; i < m; i++) {
		int x, y; cin >> x >> y;
		unite(x, y);
	}
	for (int i = 0; i < n; i++) {
		s.insert(root(i));
		v[pt[i]].push_back(a[i]);
	}
	for (auto i = s.begin(); i != s.end(); i++) {
		sort(v[*i].begin(), v[*i].end());
		ans += v[*i][0];
		for (int j = 1; j < v[*i].size(); j++)v1.push_back(v[*i][j]);
	}
	sort(v1.begin(), v1.end());
	for (int i = 0; i < max((int)0, (n - 1 - m) * 2 - s.size()); i++)ans += v1[i];
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:50:32: error: no matching function for call to 'max(long long int, long long unsigned int)'
   50 |         for (int i = 0; i < max((int)0, (n - 1 - m) * 2 - s.size()); i++)ans += v1[i];
      |                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:50:32: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long long unsigned int')
   50 |         for (int i = 0; i < max((int)0, (n - 1 - m) * 2 - s.size()); i++)ans += v1[i];
      |                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:50:32: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   50 |         for (int i = 0; i < max((int)0, (n - 1 - m) * 2 - s.size()); i++)ans += v1[i];
      |                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~