criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <deque>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include <cfloat>

using std::cerr;
using std::cin;
using std::cout;
using std::endl;

// Manages Union-Find Forest.
class UnionFindForest {
  std::vector<int> parent_;
  std::vector<int> rank_;
  std::vector<int> size_;

public:
  // Initialize forest.
  // parent_[i]=i, rank_[i]=0, size_[i]=1.
  UnionFindForest(const int &n);
  // Get the number of the root of the node q.
  int Root(const int &q);
  // Return true if the roots of x and y is same.
  bool IsSame(const int &x, const int &y);
  // Unite the tree x and tree y.
  void Unite(int x, int y);
  // Get the number of nodes which are the same group as node q.
  int Size(const int &q);
};
UnionFindForest::UnionFindForest(const int &n) {
  parent_.resize(n);
  rank_.resize(n);
  size_.resize(n);
  for (int i = 0; i < n; i++) {
    parent_[i] = i;
    rank_[i]   = 0;
    size_[i]   = 1;
  }
}
int UnionFindForest::Size(const int &q) {
  return size_[Root(q)];
}

int UnionFindForest::Root(const int &q) {
  if (parent_[q] == q) {
    return q;
  } else {
    return parent_[q] = Root(parent_[q]);
  }
}

bool UnionFindForest::IsSame(const int &x, const int &y) {
  return Root(x) == Root(y);
}

void UnionFindForest::Unite(int x, int y) {
  x = Root(x);
  y = Root(y);
  if (x == y) return;
  if (rank_[x] < rank_[y]) {
    parent_[x] = y;
    size_[y] += size_[x];
    size_[x] = 0;

  } else {
    parent_[y] = x;
    size_[x] += size_[y];
    size_[y] = 0;
    if (rank_[x] == rank_[y]) rank_[x]++;
  }
}

using namespace std;

int main(){
  cout << std::fixed << std::setprecision(16);
  cin.tie(nullptr);
  std::ios::sync_with_stdio(false);
  int n,m;
  cin>>n>>m;
  vector<pair<int,int>> a(n);
  for(int i = 0; i < n; ++i){
    int v;
    cin>>v;
    a[i]=make_pair(v,i);
  }
  UnionFindForest uf(n);
  for(int i = 0; i < m; ++i){
    int x,y;
    cin>>x>>y;
    uf.Unite(x,y);

  }
  vector<pair<int,int>> cost[100000];
  for(int i=0;i<n;i++){
    cost[uf.Root(i)].push_back(a[i]);
  }
  for(int i=0;i<n;i++){
    std::sort(cost[i].begin(), cost[i].end());
  }
  vector<int> first,second;
  vector<bool> used(n);
  int count=0;
  int64_t result=0;
  for(int i=0;i<n&&count<2*(n-m-1);i++){
    if(cost[i].empty()) continue;

    result+=(int64_t)cost[i][0].first;
    used[cost[i][0].second]=true;
    count++;

  }
  vector<int> unused_cost;
  for(int i=0;i<n;i++){
    if(!used[i]){
      unused_cost.push_back(a[i].first);
    }
  }
  std::sort(unused_cost.begin(), unused_cost.end());
  int itr=0;
  for(;count<2*(n-m-1);count++){
    if(itr>=unused_cost.size()){
      cout<<"Impossible"<<endl;
      return 0;
    }5 0
    3 1 4 1 5
    result+=(int64_t)unused_cost[itr];
    itr++;

  }
  cout<<result<<endl;







  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:137:7: error: expected ';' before numeric constant
  137 |     }5 0
      |       ^~
      |       ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,N) for(int i=0,i##_max=(N);i<i##_max;++i)
#define repp(i,l,r) for(int i=(l),i##_max=(r);i<i##_max;++i)
#define per(i,N) for(int i=(N)-1;i>=0;--i)
#define perr(i,l,r) for(int i=r-1,i##_min(l);i>=i##_min;--i)
#define all(arr) (arr).begin(), (arr).end()
#define SP << " " <<
#define SPF << " "
#define SPEEDUP cin.tie(0);ios::sync_with_stdio(false);
#define MAX_I INT_MAX //1e9
#define MIN_I INT_MIN //-1e9
#define MAX_UI UINT_MAX //1e9
#define MAX_LL LLONG_MAX //1e18
#define MIN_LL LLONG_MIN //-1e18
#define MAX_ULL ULLONG_MAX //1e19
  typedef long long ll;
  typedef pair<int,int> PII;
  typedef pair<char,char> PCC;
  typedef pair<ll,ll> PLL;
  typedef pair<char,int> PCI;
  typedef pair<int,char> PIC;
  typedef pair<ll,int> PLI;
  typedef pair<int,ll> PIL; 
  typedef pair<ll,char> PLC; 
  typedef pair<char,ll> PCL; 

inline void YesNo(bool b){ cout << (b?"Yes" : "No") << endl;}
inline void YESNO(bool b){ cout << (b?"YES" : "NO") << endl;}
inline void Yay(bool b){ cout << (b?"Yay!" : ":(") << endl;}

using smallpque = priority_queue<ll,vector<ll>,greater<ll> >;

const int VMAX = 1e6+10, EMAX = 1e6+10;
int V,E;

class UnionFind{
  private:
    vector<int> Parent;
  public:
    UnionFind(int N){
      Parent = vector<int>(N,-1);
    }

    int find(int x){
      if(Parent[x] < 0) return x;
      return Parent[x] = find(Parent[x]);
    }

    int size(int x){
      return -Parent[find(x)];
    }

    bool unite(int x, int y){
      x = find(x);
      y = find(y);
      if(x==y) return false;

      if(size(x)<size(y))swap(x,y);
      Parent[x] += Parent[y];
      Parent[y] = x;
      return true;
    }

    bool same(int x, int y){
      return find(x) == find(y);
    }
};

int main(void){
  SPEEDUP
  cout << setprecision(15);
  cin >> V >> E;
  vector<ll> cost(N);
  UnionFind uni = UnionFind(V);
  rep(v,V)cin >> cost[v];
  rep(e,E){
    int x,y;cin >> x >> y;
    uni.unite(x,y);
  }

  vector<smallpque> spques(N);
  rep(v,V) spques[uni.find(v)].push(cost[v]);
  vector<bool> used(N,false);
  smallpque pque;
  ll ans = 0;
  int count = 0;
  rep(v,V){
    if(uni.find(v)!=v)continue;
    ++count;
    ans += spques[v].top();
    spques[v].pop();
    while(!spques[v].empty()){
      pque.push(spques[v].top());
      spques[v].pop();
    }
  }
  rep(i,V-1-E-count){
    if(pque.empty()){
      cout << "Impossible" << endl;
      return 0;
    }
    ans += pque.top();
    pque.pop();
  }
  cout << ans << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:74:19: error: 'N' was not declared in this scope
   74 |   vector<ll> cost(N);
      |                   ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using db = double;
using ld = long double;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define eb emplace_back
#define all(v) (v).begin(),(v).end()
#define siz(v) (ll)(v).size()
#define rep(i,a,n) for(ll i=a;i<(ll)(n);i++)
#define repr(i,a,n) for(ll i=n-1;(ll)a<=i;i--)
#define lb lower_bound
#define ub upper_bound
typedef pair<int,int> P;
typedef pair<ll,ll> PL;
const ll mod = 1000000007;
const ll INF = 1000000099;
const ll LINF = (ll)(1e18 +99);
vector<ll> dx={-1,1,0,0},dy={0,0,-1,1};
template<typename T,typename U> void chmin(T& t, const U& u){if(t>u)t=u;}
template<typename T,typename U> void chmax(T& t, const U& u){if(t<u)t=u;}
template<typename T>T gcd(T a,T b){return b?gcd(b,a%b):a;}
template<typename T>T mpow(T a, T n) {
   T res = 1;
   for(;n;n>>=1) {
      if (n & 1) res = res * a;
      a = a * a;
   }
   return res;
}

//cin.tie(0);ios::sync_with_stdio(false);

template<typename T>
class UnionFind {
public:

	//親の番号を格納する。親である場合は-(その集合のサイズ)
	vector<T> Parent;
 
	//作るときはParentの値を全て-1にする
	//こうすると全てバラバラになる
	UnionFind(T N) {
		Parent = vector<T>(N, -1);
	}
 
	//Aがどのグループに属しているか調べる
	T root(T A) {
		if (Parent[A] < 0) return A;
		return Parent[A] = root(Parent[A]);
	}//代入しておくことで参照を速くする
 
	//自分のいるグループの頂点数を調べる
	T size(T A) {
		return -Parent[root(A)];
	}//親である場合は-(その集合のサイズ)なので、Ａの親の
 
	//AとBをくっ付ける
	bool connect(T A, T B) {
		//AとBを直接つなぐのではなく、root(A)にroot(B)をくっつける
		A = root(A);
		B = root(B);
		if (A == B) {
			//すでにくっついてるからくっ付けない
			return false;
		}
 
		//大きい方(A)に小さいほう(B)をくっ付けたい
		//大小が逆だったらひっくり返しちゃう。
		if (size(A) < size(B)) swap(A, B);
 
		//Aのサイズを更新する
		Parent[A] += Parent[B];
		//Bの親をAに変更する
		Parent[B] = A;
 
		return true;
	}

    bool same(T A,T B){
        return root(A)==root(B);
    }
};

signed main(){
    ll n,m,ans=0;cin>>n>>m;
    vector<PL> a(n);
    rep(i,0,n){
        cin>>a[i].fs;
        a[i].sc=i;
    }

    UnionFind<int> u(n);
    
    rep(i,0,m){
        int x,y;cin>>x>>y;
        u.connect(x,y);
    }

    sort(all(a));
    
    priority_queue<ll,vector<ll>,greater<ll>> q;
    rep(l,0,n){
        if(u.root[a[l].sc]!=u.root(a[0].sc)){
            ans+=q.top()+a[l].fs;
            q.pop();
        }else{
            q.push(a[l].fs);
        }
    }

    rep(i,1,n){
        if(u.root(i)!=u.root(0)){
            cout<<"Impossible"<<endl;
            return 0;
        }
    }
    cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:108:18: error: invalid types '<unresolved overloaded function type>[long long int]' for array subscript
  108 |         if(u.root[a[l].sc]!=u.root(a[0].sc)){
      |                  ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

const int MAXN = 1e5 + 10, inf = 1e9 + 10;

bool mark[MAXN];
int x, y;
long long n, m, ans;
int mn = inf;
int ind;
int a[MAXN];
int v[MAXN];
vector <int> adj[MAXN];

int dfs (int root) {
    mark[root] = true;
    mn = min(mn, a[root]);
    for (auto u: adj[root])
        if (!mark[u]) {
            int tmp = dfs(u);
            mn = min(mn, tmp);
        }
    return mn;
} 

int main() {
    cin >> n >> m;
    for (int i = 0; i < n; i++)
        cin >> a[i];
    for (int i = 0; i < m; i++) {
        cin >> x >> y; 
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    
    for (int i = 0; i < n; i++) {
        mn = inf;
        if (!mark[i])
            v[ind++] = dfs(i);
        if (ind > 2)
            
    }
    sort (v, v + ind);
    
    for (int i = 1; i < ind; i++) 
        ans += (v[i] + v[0]);
    if (ind > 2)
        return cout << "Impossible" << '\n', 0;
    cout << ans << '\n';
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:42:5: error: expected primary-expression before '}' token
   42 |     }
      |     ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define For(i,n,k) for(ll i=(n);i<(k);i++)
ll n,m,ans=0;
// 素集合データ構造
struct UnionFind
{
  // par[i]：データiが属する木の親の番号。i == par[i]のとき、データiは木の根ノードである
  vector<int> par;
  // sizes[i]：根ノードiの木に含まれるデータの数。iが根ノードでない場合は無意味な値となる
  vector<int> sizes;
  UnionFind(int n) : par(n), sizes(n, 1) {
    // 最初は全てのデータiがグループiに存在するものとして初期化
    for(int i=0;i<n;i++) par[i] = i;
  }

  // データxが属する木の根を得る
  int find(int x) {
    if (x == par[x]) return x;
    return par[x] = find(par[x]);  // 根を張り替えながら再帰的に根ノードを探す
  }
  // 2つのデータx, yが属する木をマージする
  void unite(int x, int y) {
    // データの根ノードを得る
    x = find(x);
    y = find(y);

    // 既に同じ木に属しているならマージしない
    if (x == y) return;

    // xの木がyの木より大きくなるようにする
    if (sizes[x] < sizes[y]) swap(x, y);

    // xがyの親になるように連結する
    par[y] = x;
    sizes[x] += sizes[y];
    // sizes[y] = 0;  // sizes[y]は無意味な値となるので0を入れておいてもよい
  }
  // 2つのデータx, yが属する木が同じならtrueを返す
  bool same(int x, int y) {
    return find(x) == find(y);
  }

  // データxが含まれる木の大きさを返す
  int size(int x) {
    return sizes[find(x)];
  }
};
void Main(){   
    cin>>n>>m;
    UnionFind Tree(n);
    vector<int> a(n);
    For(i,0,n){
      cin>>a.at(i);
    }
    For(i,0,m){
        int x,y;cin>>x>>y;
        Tree.unite(x,y);
    }
    if(n<2*(n-m-1)){
        cout<<"Impossible"<<endl;
        return;
    }
    if(n==m+1){
        cout<<0<<endl;
        return;
    }
    vector<priority_queue<int,vector<int>,greater<int>>> p(n);
    For(i,0,n){
      p.at(Tree.find(i)).push(a.at(i));
    }
    priority_queue<int,vector<int>,greater<int>> all;
    int cnt=0;
    For(i,0,n){
      int t=0;
      while(!p.at(i).empty()){
        int k=p.at(i).top();
        p.at(i).pop();
        if(t==0){
          ans+=k;
          cnt++;
        }
        else{
          all.push(k);
        }
        t++;
      }
    }
    for(;cnt<2*(n-m-1)>;cnt++){
      ans+=all.top();
      all.pop();
    }
    cout<<ans<<endl;
}
int main(){
    Main();
    return 0;
}

Compiler output:
a.cc: In function 'void Main()':
a.cc:90:24: error: expected primary-expression before ';' token
   90 |     for(;cnt<2*(n-m-1)>;cnt++){
      |                        ^
Language: C++

//#include<bits/stdc++.h>
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<set>
#include<queue>
#include<deque>
#include<map>
#include<stack>
#include<bitset>
#include<list>
#include<cassert>
#include<numeric>
#include<iomanip>

using namespace std;

const long long N = 1e5 + 5;
long long n, m;
vector<long long> graph[N];
vector<long long> mini;
multiset<long long> s;
long long cost[N];
long long ans = 0;
bool mark[N];

long long isTree(long long v, long long p)
{
	p++;
	mark[v] = true;
	for (long long i = 0; i < graph[v].size(); i++)
	{
		long long u = graph[v][i];
		if (!mark[u])
		{
			p = isTree(u, p);
		}
	}
	return p;
}

bool possible()
{
	long long need = n - m - 1;
	if (n < 2 * (need))
	{
		return false;
	}
	return true;
}

long long dfs(long long v, long long p)
{
	mark[v] = true;
	if (cost[v] < cost[p])
	{
		p = v;
	}
	for (long long i = 0; i < graph[v].size(); i++)
	{
		long long u = graph[v][i];
		if (!mark[u])
		{
			dfs(u, p);
		}
	}
	return p;
}

int main()
{
	cin >> n >> m;
	for (long long i = 0; i < n; i++)
	{
		cin >> cost[i];
	}
	for (long long i = 0; i < m; i++)
	{
		long long u, v;
		cin >> u >> v;
		graph[u].push_back(v);
		graph[v].push_back(u);
	}
	long long tmp = isTree(0, 0);
	if (tmp == n)
	{
		cout << 0;
		exit(0);
	}
	memset(mark, 0, sizeof mark);
	if (!possible())
	{
		cout << "Impossible";
		exit(0);
	}
	for (long long i = 0; i < n; i++)
	{
		if (!mark[i])
		{
			long long tmp = dfs(i, i);
			ans += cost[tmp];
			mini.push_back(tmp);
		}
	}
	sort(mini.begin(), mini.end());
	for (long long i = 0; i < n; i++)
	{
		if (!binary_search(mini.begin(), mini.end(), i))
		{
			s.insert(cost[i]);
		}
	}
	for (long long i = n - m; i < 2 * (n - m - 1); i++)
	{
		ans += *(s.begin());
		s.erase(s.begin());
	}
	cout << ans << endl;

}
	
            


 


Compiler output:
a.cc: In function 'int main()':
a.cc:91:9: error: 'memset' was not declared in this scope
   91 |         memset(mark, 0, sizeof mark);
      |         ^~~~~~
a.cc:16:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
   15 | #include<iomanip>
  +++ |+#include <cstring>
   16 |
Language: C++

//#include<bits/stdc++.h>
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<set>
#include<queue>
#include<deque>
#include<map>
#include<stack>
#include<bitset>
#include<list>
#include<cassert>
#include<numeric>
#include<iomanip>

using namespace std;

const int N = 1e5 + 5;
int n, m;
vector<int> graph[N];
int cost[N];
bool mark[N];

int isTree(int v, int p)
{
	p++;
	mark[v] = true;
	for (int i = 0; i < graph[v].size(); i++)
	{
		int u = graph[v][i];
		if (!mark[u])
		{
			isTree(u, p);
		}
	}
	return p;
}

int main()
{
	cout << "Impossible";
	exit(0);
	cin >> n >> m;
	for (int i = 0; i < n; i++)
	{
		cin >> cost[i];
	}
	for (int i = 0; i < m; i++)
	{
		int u, v;
		cin >> u >> v;
		graph[u].push_back(v);
		graph[v].push_back(u);
	}
	int tmp = isTree(0, 0);
	if (tmp == n)
	{
		cout << 0;
		exit(0);
	}
	memset(mark, 0, sizeof mark);

}
	
            


 


Compiler output:
a.cc: In function 'int main()':
a.cc:62:9: error: 'memset' was not declared in this scope
   62 |         memset(mark, 0, sizeof mark);
      |         ^~~~~~
a.cc:16:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
   15 | #include<iomanip>
  +++ |+#include <cstring>
   16 |
Language: C++

#include<bits/stdc++.h>
using namespace std;
class dsu
{
	public:
	vector<int> p;
	int a;
	dsu(int _a):a(_a)
	{
	p.resize(a);
	iota(p.begin(),p.end(),0);
	}
inline int get(int x)
{
return (x==p[x]?x:(p[x]=get(p[x])));	
}
inline bool unite(int x,int y)
{
	x=get(x);
	y=get(y);
	if(x!=y)
	{
		p[x]=y;
		return true;
	}
	return false;
}
};
int main()
{
	int a,b;
	cin>>a>>b;
	vector<int> c(a);
	for(int i=0;i<a;++i)
	{
		cin>>c[i];
	}

dsu d(a);
for(int i=0;i<b;++i)
{
	int x,y;
	cin>>x>>y;
	d.unite(x,y);
}
vector< vector<int> >camp(a);
for(int i=0;i<a;++i)
{
camp[d.get(i)].push_back(c[i]);
}
int sum=0;
for(int i=0;i<a;++i)
{
	if(!camp[i].empty)
	{
	  sum++;
	}
}
if(sum==1)
{
	cout<<0;
	return 0;
}
int choose=2*sum-2;
long long ans=0;
vector<int> other;
for(int i=0;i<a;++i)
{
	if(!camp[i].empty())
	{
		sort(camp[i].begin(),camp[i].end());
		ans+=camp[i][0];
		choose--;
		for(int j=1;j<(int)camp[i].size;++j)
		{
		  other.push_back(camp[i][j]);	
		}
	}
}
if(choose>(int)other.size())
{
	cout<<"Impossible";
	return 0;
}
sort(other.begin(),other.end());
for(int i=0;i<choose;++i)
{
	ans+=other[i];
}
cout<<ans<<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:54:21: error: cannot convert 'std::vector<int>::empty' from type 'bool (std::vector<int>::)() const noexcept' to type 'bool'
   54 |         if(!camp[i].empty)
      |                     ^~~~~
a.cc:54:21: error: in argument to unary !
   54 |         if(!camp[i].empty)
a.cc:74:44: error: invalid use of member function 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]' (did you forget the '()' ?)
   74 |                 for(int j=1;j<(int)camp[i].size;++j)
      |                                                ()
Language: C

#include<bits/stdc++.h>
#include<numeric>
using namespace std;
class dsu{
	public:
	vector<int> p;
	int n;
	dsu(int _n) : n(_n){
		p.resize(n);
		iota(p.begin(),p.end(),0);
	}
	inline int get(int x){
		return (x==p[x]?x:(p[x]=get(p[x])));
	}
	inline bool unite(int x,int y){
		x=get(x);
		y=get(y);
		if(x!=y){
			p[x]=y;
			return true;
		}
		return false;
	}
};
int main()
{
	int n,m;
	cin>>n>>m;
	vector<int>a(n);
	for(int i=0;i<n;i++)
	{
		cin>>a[i];
	}
	dsu d(n);
	for(int i=0;i<m;i++)
	{
		int x,y;
		cin>>x>>y;
		d.unite(x,y);
	}
	vector< vector<int> >comp(n);
	for(int i=0;i<n;i++)
	{
		comp[d.get(i)].push_back(a[i]);
	}
	int cnt=0;
	for(int i=0;i<n;i++){
		if(!comp[i].empty()){
			cnt++;
		}
	}
	if(cnt==1){
		puts("0");
		return 0;
	}
	int choose=2*cnt-2;
	long long ans=0;
	vector<int>other;
	for(int i=0;i<n;i++){
		if(!comp[i].empty()){
			sort(comp[i].begin(),comp[i].end());
			ans+=comp[i][0];
			choose--;
			for(int j=1;j<(int)comp.size();j++){
				other.push_back(comp[i][j]);
			}
		}
	}
	if(choose>(int)other.size()){
		puts("Impossible");
		return 0;
	}
	sort(other.begin(),other.end());
	for(int i=0;i<choose;i++){
		ans+=other[i];
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
class dsu{
	public:
	vector<int>p;
	int n;
	dsu(int _n):n(_n){
		p.resize(n);
		iota(p.begin(),p.end(),0);
	}
	inline int get(int x){
		return (x==p[x]?x:(p[x]=get(p[x])));
	}
	inline bool unite(int x,int y){
		x=get(x);
		y=get(y);
		if(x!=y){
			p[x]=y;
			return true;
		}
		return false;
	}
};
int main()
{
	int n,m;
	cin>>n>>m;
	vector<int>a(n);
	for(int i=0;i<n;i++)
	{
		cin>>a[i];
	}
	dsu d(n);
	for(int i=0;i<m;i++)
	{
		int x,y;
		cin>>x>>y;
		d.unite(x,y);
	}
	vector< vector<int> >comp(n);
	for(int i=0;i<n;i++)
	{
		comp[d.get(i)].push_back(a[i]);
	}
	int cnt=0;
	for(int i=0;i<n;i++){
		if(!comp[i].empty()){
			cnt++;
		}
	}
	if(cnt==1){
		outs("0");
		return 0;
	}
	int choose=2*cnt-2;
	long long ans=0;
	vector<int>other;
	for(int i=0;i<n;i++){
		if(!comp[i].empty()){
			sort(comp[i].begin(),comp[i].end());
			ans+=comp[i][0];
			choose--;
			for(int j=1;j<(int)comp.size();j++){
				other.push_back(comp[i][j]);
			}
		}
	}
	if(choose>(int)other.size()){
		puts("Impossible");
		return 0;
	}
	sort(other.begin(),other.end());
	for(int i=0;i<choose;i++){
		ans+=other[i];
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:52:17: error: 'outs' was not declared in this scope; did you mean 'puts'?
   52 |                 outs("0");
      |                 ^~~~
      |                 puts
Language: C++

//
//  main.cpp
//  Forest
//
//  Created by SZhang on 7/26/19.
//  Copyright © 2019 SZhang. All rights reserved.
//

#include <iostream>
#include <vector>
#include <string.h>
using namespace std;
int was[100000],uf[100000],rk[100000],w[100000];

void ini(){
    for(int i=0;i<100000;i++){
        uf[i]=i;
        was[i]=0;
        rk[i]=0;
    }
}
int root(int x){
    return uf[x]==x ? x:root(uf[x]);
}

void connect(int x,int y){
    x=root(x);
    y=root(y);
    if(x==y) return;
    if(rk[x]<rk[y]) {
        uf[x]=y;
    }else{
        uf[y]=x;
        if(rk[x]==rk[y]) rk[x]++;
    }
}
int main() {
    // insert code here...
    vector<int> v;
    int n,m;
    cin>>n>>m;
    if(n==1) {
        cout<<0<<endl;
        return 0;
    }
    ini();
    for(int i=0;i<n;i++){
        cin>>w[i];
    }
    for(int i=0;i<m;i++){
        int x,y;
        cin>>x>>y;
        //h[x]=h[y]=1;
        connect(x,y);
    }
    //cout<<uf[1]<<endl;
    int counter=-1;
    for(int i=0;i<n;i++){
        if(uf[i]==i) {
            counter++;
            v.push_back(i);
        }
    }
    //cout<<counter<<endl;
    //cout<<v[0]<<v[1]<<endl;
    //cout<<root(0)<<endl;
    int v1=0,sum=0;
    for(int i=0;i<=counter;i++){
        int mn=1000000000;
        for(int j=0;j<n;j++){
            if(!was[j]){
                if(v[i]==root(j)) {
                    if(mn>w[j]) {
                        mn=w[j];
                        v1=j;
                    }
                }
            }
        }
        //cout<<v1;
        was[v1]=1;
        sum+=w[v1];
        w[v1]=-1;
    }
    sort(w,w+n);
    int p;
    for(p=0;w[p]==-1;p++);
    if(n-p-1<counter){
        cout<<"Impossible"<<endl;
        return 0;
    }
    for(int j=1;j<counter;j++){
        sum+=w[p+j];
    }
    cout<<sum<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:85:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   85 |     sort(w,w+n);
      |     ^~~~
      |     short
Language: C++

#include<bits/stdc++.h>
using namespace std;
const int maxn=100005;
struct node{
    int val,id;
    const operator < (const node &x) const{
        return val>x.val;
    }
};
priority_queue<int>q;
vector<int>vec[maxn];
int a[maxn],fa[maxn];
int Find(int x){return fa[x]==x?fa[x]:fa[x]=Find(fa[x]);}
void Union(int x,int y){
    int xx=Find(x),yy=Find(y);
    if(xx!=yy) fa[xx]=yy;
}
void read(int &ret){
    ret=0;
    char ch=getchar();
    while(ch>'9'||ch<'0') ch=getchar();
    while(ch>='0'&&ch<='9'){
        ret=ret*10+ch-'0';
        ch=getchar();
    }
}
int main(){
    int n,m;
    read(n),read(m);
    for(int i=0;i<=n;i++) fa[i]=i;
    for(int i=0;i<n;i++){read(a[i]);}
    int u,v;
    for(int i=1;i<=m;i++){
        read(u),read(v);
        Union(u,v);
    }
    if(n==m+1){puts("0");return 0;}
    for(int i=0;i<n;i++){vec[Find(i)].push_back(a[i]);}
    long long ans=0;
    int cnt=0;
    for(int i=0;i<n;i++){
        if(vec[i].size()){
            sort(vec[i].begin(),vec[i].end());
            ans+=vec[i][0];
            cnt++;
            for(int j=1;j<vec[i].size();j++) q.push(vec[i][j]);
        }
    }
    if((n-m-1)*2>n){puts("Impossible");return 0;}
    while(!q.empty()){
        if(cnt>=(n-m-1)*2) break;
        ans+=q.top();q.pop();
        cnt+=1;
    }
    printf("%lld\n",ans);
    return 0;
}


Compiler output:
a.cc:6:11: error: ISO C++ forbids declaration of 'operator<' with no type [-fpermissive]
    6 |     const operator < (const node &x) const{
      |           ^~~~~~~~
Language: C++

#include <cstdio>
#include <vector>
#include <algorithm>
const int N = 100032;
using namespace std;

int a[N];
vector<int> e[N], que, buf;
bool vis[N];

void dfs(int x, int fa) {
	vis[x] = true;
	buf.push_back(a[x]);
	for (int u : e[x])
		if (u != fa) dfs(u,x);
}

int main() {
	int n, m, p = 0, u, v;
	scanf("%d%d",&n,&m);
	if (m == n-1) {puts("0"); return 0;}
	for (int i = 0; i < n; i++)
		scanf("%d",a+i);
	while (m--) {
		scanf("%d%d",&u,&v);
		e[u].push_back(v);
		e[v].push_back(u);
	}
	long long ans = 0;
	for (int i = 0; i < n; i++) {
		if (vis[i]) continue;
		dfs(i,-1); p++;
		auto it = min_element(buf.begin(), buf.end());
		ans += *it;
		swap(*it, buf.back());
		que.insert(que.end(), buf.begin(), buf.end()-1);
		buf.clear();
	}
	auto l = que.begin(), r = l + p-2;
	if (r > que.end()) {puts("Impossible"); return 0;}
	nth_element(l, r, que.end());
	printf("%lld\n",accumulate(l, r, ans));
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:42:25: error: 'accumulate' was not declared in this scope
   42 |         printf("%lld\n",accumulate(l, r, ans));
      |                         ^~~~~~~~~~
Language: C++

#include<algorithm>
#include<cstdio>
#include<cstring>
#include<vector>

const int Maxv = 100020, INF = 0x7fffffff; 
std::vector<int> g[Maxv]; 
int fa[Maxv], idx[Maxv], cnt; 
long long ans; 
bool vis[Maxv]; 

inline int read(){
    int x = 0, f = 1; 
    char ch = getchar(); 
    while (ch < '0' || ch > '9') {
        if (ch == '-') {
            f = -1; 
        }
        ch = getchar(); 
    }
    while (ch >= '0' && ch <= '9') {
        x = (x << 3) + (x << 1) + ch - '0'; 
        ch = getchar();
    }
    return x * f; 
}

bool cmp(int a, int b){
    return v[a] < v[b]; 
}

inline int find(int x){
    if (fa[x] == x) {
        return x; 
    }
    else {
        fa[x] = find(fa[x]);
    }
    return fa[x]; 
}

inline void merge(int u, int v){
    int fu = find(u); 
    int fv = find(v); 
    if (fu != fv) {
        fa[fu] = fv; 
    }
    cnt++; 
}

int main(){
    n = read();
    m = read(); 
    for (int i = 1; i <= n; i++) {
        v[i] = read(); 
        fa[i] = i; 
    }
    for (int i = 1; i <= m; i++) {
        int u = read() + 1; 
        int v = read() + 1; 
        merge(u, v); 
    }
    if (cnt == n - 1) {
        printf("0\n"); 
        return 0; 
    }
    int k = (n - 1 - cnt) << 1; 
    if (k > n) {
        printf("Impossible"); 
        return 0; 
    }
    for (int i = 1; i <= n; i++) {
        idx[i] = i; 
    }
    std::sort(idx + 1, idx + n + 1, cmp); 
    for (int i = 1; i <= n; i++) {
        int fi = find(i); 
        g[fi].push_back(i); 
    }
    for (int i = 1; i <= n; i++) {
        if (i == fa[i]) {
            int Min = INF;
            int Index; 
            for (int j = 0; j < g[i].size(); j++) {
                if (v[g[i][j]] < Min) {
                    Min = v[ g[i][j] ]; 
                    Index = g[i][j]; 
                }
            } 
            ans += Min; 
            vis[Index] = true; 
            k--; 
        }
    }
    for (int i = 1; i <= n; i++) {
        if (k && !vis[ idx[i] ]) {
            ans += v[ idx[i] ]; 
            vis[ idx[i] ] = true; 
            k--; 
        }
    }
    printf("%d\n", ans); 
    return 0; 
}

Compiler output:
a.cc: In function 'bool cmp(int, int)':
a.cc:29:12: error: 'v' was not declared in this scope
   29 |     return v[a] < v[b];
      |            ^
a.cc: In function 'int main()':
a.cc:52:5: error: 'n' was not declared in this scope
   52 |     n = read();
      |     ^
a.cc:53:5: error: 'm' was not declared in this scope
   53 |     m = read();
      |     ^
a.cc:55:9: error: 'v' was not declared in this scope
   55 |         v[i] = read();
      |         ^
a.cc:85:21: error: 'v' was not declared in this scope
   85 |                 if (v[g[i][j]] < Min) {
      |                     ^
a.cc:97:20: error: 'v' was not declared in this scope
   97 |             ans += v[ idx[i] ];
      |                    ^
Language: C++

void tag_pieces(cascade& cas)
{
  for(int i = 0; i < cas.m; i++)
    for(int j = 0; j < cas.n; j++) {
    }
}
void fall(cascade& cas)
{
}

void remove_pieces(cascade& cas)
{
  if(tag_pieces(cas)) {
    fall(cas);
    remove_pieces(cas);
  }
}
int main()
{
  int n, i;
  int kase = 0;
  while(cin >> n, n) {
    
    cout << "Case " << ++kase << ": " << ans << endl;
  }
  return 0;
}


Compiler output:
a.cc:1:6: error: variable or field 'tag_pieces' declared void
    1 | void tag_pieces(cascade& cas)
      |      ^~~~~~~~~~
a.cc:1:17: error: 'cascade' was not declared in this scope
    1 | void tag_pieces(cascade& cas)
      |                 ^~~~~~~
a.cc:1:26: error: 'cas' was not declared in this scope
    1 | void tag_pieces(cascade& cas)
      |                          ^~~
a.cc:7:6: error: variable or field 'fall' declared void
    7 | void fall(cascade& cas)
      |      ^~~~
a.cc:7:11: error: 'cascade' was not declared in this scope
    7 | void fall(cascade& cas)
      |           ^~~~~~~
a.cc:7:20: error: 'cas' was not declared in this scope
    7 | void fall(cascade& cas)
      |                    ^~~
a.cc:11:6: error: variable or field 'remove_pieces' declared void
   11 | void remove_pieces(cascade& cas)
      |      ^~~~~~~~~~~~~
a.cc:11:20: error: 'cascade' was not declared in this scope
   11 | void remove_pieces(cascade& cas)
      |                    ^~~~~~~
a.cc:11:29: error: 'cas' was not declared in this scope
   11 | void remove_pieces(cascade& cas)
      |                             ^~~
a.cc: In function 'int main()':
a.cc:22:9: error: 'cin' was not declared in this scope
   22 |   while(cin >> n, n) {
      |         ^~~
a.cc:24:5: error: 'cout' was not declared in this scope
   24 |     cout << "Case " << ++kase << ": " << ans << endl;
      |     ^~~~
a.cc:24:42: error: 'ans' was not declared in this scope
   24 |     cout << "Case " << ++kase << ": " << ans << endl;
      |                                          ^~~
a.cc:24:49: error: 'endl' was not declared in this scope
   24 |     cout << "Case " << ++kase << ": " << ans << endl;
      |                                                 ^~~~
Language: C++

#prag\
ma GCC optimize("Ofast")
#include <bits/stdc++.h>
typedef long long ll;
#define N 100005
using namespace std;
int n,m,a[N],fa[N],index[N],tmp[N];
bool visited[N];
int Find(int x)
{
	if(fa[x]!=x) fa[x]=Find(fa[x]);
	return fa[x]; 
}
bool cmp(int x,int y)
{
	return a[x]<a[y];
}
int main()
{
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;++i)
	{
		scanf("%d",&a[i]);
		fa[i]=i;
	}
	for(int i=1;i<=m;++i)
	{
		int u,v; scanf("%d%d",&u,&v); ++u; ++v;
		int fu=Find(u),fv=Find(v); fa[fv]=fu;
	}
	if(m==n-1)
	{
		printf("0\n");
		return 0;
	}
	for(int i=1;i<=n;++i) if(fa[i]==i) index[i]=i;
	for(int i=1;i<=n;++i) if(a[i]<a[index[Find(i)]]) index[fa[i]]=i;
	int ans=0,cnt=0;
	for(int i=1;i<=n;++i) if(fa[i]==i) visited[index[i]]=true,ans+=a[index[i]],++cnt;
	for(int i=1;i<=n;++i) tmp[i]=i;
	sort(tmp+1,tmp+n+1,cmp);
	for(int i=1;i<=n && cnt<2*(n-m-1);++i) if(!visited[i]) ans+=a[tmp[i]],++cnt;
	if(cnt<2*(n-m-1)) printf("Impossible\n"); else printf("%d\n",ans);
	return 0;
}

Compiler output:
a.cc:7:27: error: 'int index [100005]' redeclared as different kind of entity
    7 | int n,m,a[N],fa[N],index[N],tmp[N];
      |                           ^
In file included from /usr/include/string.h:462,
                 from /usr/include/c++/14/cstring:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:121,
                 from a.cc:3:
/usr/include/strings.h:50:20: note: previous declaration 'const char* index(const char*, int)'
   50 | extern const char *index (const char *__s, int __c)
      |                    ^~~~~
a.cc: In function 'int main()':
a.cc:36:49: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   36 |         for(int i=1;i<=n;++i) if(fa[i]==i) index[i]=i;
      |                                                 ^
a.cc:37:46: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   37 |         for(int i=1;i<=n;++i) if(a[i]<a[index[Find(i)]]) index[fa[i]]=i;
      |                                              ^
a.cc:37:63: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   37 |         for(int i=1;i<=n;++i) if(a[i]<a[index[Find(i)]]) index[fa[i]]=i;
      |                                                               ^
a.cc:39:57: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   39 |         for(int i=1;i<=n;++i) if(fa[i]==i) visited[index[i]]=true,ans+=a[index[i]],++cnt;
      |                                                         ^
a.cc:39:79: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   39 |         for(int i=1;i<=n;++i) if(fa[i]==i) visited[index[i]]=true,ans+=a[index[i]],++cnt;
      |                                                                               ^
Language: C++

#include <iostream>
#include <algorithm>
#include <cmath>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <string.h>
#include <stack>
#define Endl endl
#define mp make_pair
#define rep(N) for(int i=0;i<N;i++)
#define repj(N) for(int j=0;j<N;j++)
#define ll long long 
#define pii pair<int,int>
#define pll pair<ll,ll>
#define For(I,N) for(int I=0;I<N;I++)
#define cinone(N) int N;cin>>N;
#define scanfone(N) int N;cin>>N;
#define cinng(N,M) int N[M];for(int yiuytvnm=0;yiuytvnm<M;yiuytvnm++) cin>>N[yiuytvnm];
#define scanfng(N,M) int N[M];for(int qrwuoiq=0;qrwuoiq<M;qrwuoiq++) scanf("%d",&N[qrwuoiq]);
#define finish(END) {cout<<END<<endl;exit(0);}
typedef unsigned long long ull;
using namespace std;
ll n,m;
ll a[100005];
vector <ll> vec[100005];
ll f[100005];
ll c[100005];
ll k;
priority_queue <pii,vector <pii>,greater<pii> >que[100005];

ll find(ll x)
{
	return (x==f[x]?x:f[x]=find(f[x]));
}

void dfs(ll x,ll p,ll c)
{
	que[c].push(mp(a[x],x));
	::c[x]=c;
	for(ll i=0;i<vec[x].size();i++)
	{
		if(vec[x][i]==p) continue;
		dfs(vec[x][i],x,c);
	}
}

ll main()
{
//	freopen("input.txt","r",stdin);
	cin>>n>>m;
	memset(c,-1,sizeof(c));
	for(ll i=0;i<n;i++)
	{
		cin>>a[i];
//		scanf("%d",a+i);
	}
	ll x,y;
	for(ll i=0;i<m;i++)
	{
		cin>>x>>y;
//		scanf("%d%d",&x,&y);
		vec[x].push_back(y);
		vec[y].push_back(x);
	}
	for(ll i=0;i<n;i++)
	{
		if(c[i]==-1) dfs(i,-1,k++);
	}
	ll ans=0;
	if(k==1) finish(0);
	bool use[100005];
	memset(use,false,sizeof(use));
	for(ll i=0;i<k;i++)
	{
		ans+=que[i].top().first;
		use[que[i].top().second]=true;
		que[i].pop();
	}
	priority_queue <pii,vector<pii>,greater<pii> > pq;
	for(ll i=0;i<n;i++)
	{
		if(use[i]) continue;
		pq.push(mp(a[i],i));
	}
	for(ll i=0;i<2*(k-1)-k;i++)
	{
		if(pq.empty()) finish("Impossible");
		ans+=pq.top().first;
		pq.pop();
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
cc1plus: error: '::main' must return 'int'
Language: C++

#include <cstdio>
#include <algorithm>
#include <vector>
using namespace std;
#define rep(i,n) for (int i=0;i<(n);i++)
typedef long long ll;
const int Maxn=200005;
ll a[Maxn];
int par[Maxn];
vector <ll> v[Maxn];
ll ans,cnt;
int n,m;
int find(int x)
{
	if (par[x]==x) return x;
	return par[x]=find(par[x]);
}
int main()
{
	cin>>n>>m;
	rep(i,n) cin>>a[i];
	rep(i,n) par[i]=i;
	rep(i,m)
	{
		int x,y;
		cin>>x>>y;
		par[find(x)]=find(y);
	}
	rep(i,n)
	{
		v[find(i)].push_back(a[i]);
	}
	vector <ll> p;
	rep(i,n)
	{
		if (v[i].empty()) continue;
		cnt++;
		sort(v[i].begin(),v[i].end());
		ans+=v[i][0];
		for (int j=1;j<v[i].size();j++)
		{
			p.push_back(v[i][j]);
		}
	}
	if (cnt==1)
	{
		cout<<0<<endl;
		return 0;
	}
	sort(p.begin(),p.end());
	rep(i,2*(n-m-1)-cnt)
	{
		if (p.size()<=i)
		{
			cout<<"Impossible\n";
			return 0;
		}
		ans+=p[i];
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:9: error: 'cin' was not declared in this scope
   20 |         cin>>n>>m;
      |         ^~~
a.cc:4:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    3 | #include <vector>
  +++ |+#include <iostream>
    4 | using namespace std;
a.cc:47:17: error: 'cout' was not declared in this scope
   47 |                 cout<<0<<endl;
      |                 ^~~~
a.cc:47:17: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:47:26: error: 'endl' was not declared in this scope
   47 |                 cout<<0<<endl;
      |                          ^~~~
a.cc:4:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    3 | #include <vector>
  +++ |+#include <ostream>
    4 | using namespace std;
a.cc:55:25: error: 'cout' was not declared in this scope
   55 |                         cout<<"Impossible\n";
      |                         ^~~~
a.cc:55:25: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:60:9: error: 'cout' was not declared in this scope
   60 |         cout<<ans<<endl;
      |         ^~~~
a.cc:60:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:60:20: error: 'endl' was not declared in this scope
   60 |         cout<<ans<<endl;
      |                    ^~~~
a.cc:60:20: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
Language: C++

#include <cstdio>
#include <cmath>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <ctime>
#include <cstring>
#include <iostream>
#include <algorithm>
#define debug(x) cout<<#x<<" = "<<x<<endl;
#define lowbit(x) x&(-x)
#define PA pair<int, int>
#define MK make_pair
using namespace std;
typedef long long LL;
inline int read()
{
	int l = 0, f = 1;
	char a = getchar();
	for (; a < '0' || a > '9'; a = getchar())
		if (a == '-') f = -1;
	for (; a >= '0' && a <= '9'; a = getchar())
		l = l*10+a-48;
	return l*f;
}
const int N = 100005;
struct Edge
{
	int v, next;
}e[N*10];
int n, m, num, cnt, tot, h[N], c[N], vis[N];
vector <int> a, b;
void insert(int u, int v)
{
	e[++num].v = v, e[num].next = h[u], h[u] = num;
	e[++num].v = u, e[num].next = h[v], h[v] = num;
}
void dfs(int x)
{
	if (vis[x]) return;
	a.push_back(c[x]);
	vis[x] = 1;
	for (int i = h[x]; i; i = e[i].next)
		dfs(v);
}
int main(int argc, char const *argv[])
{
	n = read(), m = read();
	if (n < 2*(n-m-1))
	{
		printf("Impossible\n");
		return 0;
	}
	if (m == n-1)
	{
		printf("0\n");
		return 0;
	}
	for (int i = 0; i < n; ++i) c[i] = read();
	for (int i = 1; i <= m; ++i)
	{
		int u = read(), v = read();
		insert(u, v);
	}
	LL ans = 0;
	for (int i = 0; i < n; ++i)
	{
		if (vis[i]) continue;
		dfs(i);
		sort(a.begin(), a.end());
		ans += a[0];
		for (int j = 1; j <= a.size(); ++j) b.push_back(a[j]);
		a.clear();
		++tot; 
	}
	sort(b.begin(), b.end());
	for (int i = tot; i < 2*(n-m-1); ++i) ans += b[i-tot];
	printf("%lld\n", ans);
	return 0;
}

Compiler output:
a.cc: In function 'void dfs(int)':
a.cc:45:21: error: 'v' was not declared in this scope
   45 |                 dfs(v);
      |                     ^
Language: C++

C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
7 5
1 2 3 4 5 6 7
3 0
4 0
1 2
1 3
5 6
7

Process finished with exit code 0


Compiler output:
a.cc:1:3: error: stray '\' in program
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      |   ^
a.cc:1:9: error: stray '\' in program
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      |         ^
a.cc:1:15: error: stray '\' in program
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      |               ^
a.cc:1:29: error: stray '\' in program
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      |                             ^
a.cc:1:32: error: stray '\' in program
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      |                                ^
a.cc:1:50: error: stray '\' in program
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      |                                                  ^
a.cc:1:2: error: found ':' in nested-name-specifier, expected '::'
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      |  ^
      |  ::
a.cc:1:1: error: 'C' does not name a type
    1 | C:\Users\tassa\CLionProjects\CP\cmake-build-debug\CP.exe
      | ^
Language: C++

#include <iostream>
#include <vector>
using namespace std;

int N, M;
int A[100000];
vector<int> G[100000];
bool used[100000];
multiset<int> ms[100000];

void DFS(int from, int prev, int start) {
  used[from] = true;
  ms[start].insert(A[from]);
  for(int to : G[from]){
    if (to == prev || used[to]) continue;
    DFS(to, from, start);
  }
}

int main() {
  cin >> N >> M;
  if (M + 1 == N) {
    cout << 0 << endl;
    return 0;
  }
  
  for (int i = 0; i < N; ++i) {
    cin >> A[i];
  }
  for (int i = 0; i < M; ++i) {
    int a, b;
    cin >> a >> b;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  
  vector<int> tr;
  for (int i = 0; i < N; ++i) {
    if (used[i]) continue;
    tr.push_back(i);
    DFS(i, -1, i);
  }
  
  long long sum = 0;
  vector<int> v;
  for (int i = 0; i < tr.size(); ++i) {
    sum += *tr.begin();
    for (auto it = next(tr.begin()); it != tr.end(); ++it) {
      v.push_back(*it);
    }
  }
  
  sort(v.begin(), v.end());
  if(v.size() < tr.size() - 2) {
    cout << "Impossible" << endl;
    return 0;
  }
  
  for(int i = 0; i < tr.size() - 2; ++i) {
    sum += v[i];
  }
  cout << sum << endl;
  
  return 0;
}


Compiler output:
a.cc:9:1: error: 'multiset' does not name a type
    9 | multiset<int> ms[100000];
      | ^~~~~~~~
a.cc: In function 'void DFS(int, int, int)':
a.cc:13:3: error: 'ms' was not declared in this scope
   13 |   ms[start].insert(A[from]);
      |   ^~
a.cc: In function 'int main()':
a.cc:53:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   53 |   sort(v.begin(), v.end());
      |   ^~~~
      |   short
Language: C++

#include <vector>
#include <iostream>
#include <queue>
#include <map>
#include <functional>

#define REP(i,n) for(ll i=0;i<ll(n);++i)
#define RREP(i,n) for(ll i=ll(n)-1;i>=0;--i)
#define FOR(i,m,n) for(ll i=m;i<ll(n);++i)
#define RFOR(i,m,n) for(ll i=ll(n)-1;i>=ll(m);--i)
#define ALL(v) (v).begin(),(v).end()
#define UNIQUE(v) v.erase(unique(ALL(v)),v.end());
#define DUMP(v) REP(aa, (v).size()) { cout << v[aa]; if (aa != v.size() - 1)cout << " "; else cout << endl; }
#define INF 1000000001ll
#define MOD 1000000007ll
#define EPS 1e-9

const int dx[8] = { 1,1,0,-1,-1,-1,0,1 };
const int dy[8] = { 0,1,1,1,0,-1,-1,-1 };


using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
ll max(ll a, int b) { return max(a, ll(b)); }
ll max(int a, ll b) { return max(ll(a), b); }
ll min(ll a, int b) { return min(a, ll(b)); }
ll min(int a, ll b) { return min(ll(a), b); }
struct UnionFind {
	vector<int> par;
	vector<int> sizes;

	UnionFind(int n) {
		par.resize(n);
		sizes.resize(n);
		REP(i, n) {
			par[i] = i;
			sizes[i] = 1;
		}
	}

	int root(int a) {
		return par[a] == a ? a : par[a] = root(par[a]);
	}

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

	void unite(int x, int y) {
		x = root(x);
		y = root(y);
		if (x == y)return;
		if (sizes[x] < sizes[y]) swap(x, y);

		par[y] = x;
		sizes[x] += sizes[y];
	}
	int size(int x) {
		return sizes[root(x)];
	}
};

using pq = priority_queue < ll, vl, less<ll>>;
int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n, m;
	cin >> n >> m;
	vl a(n);
	REP(i, n)cin >> a[i];
	map<int, vl> mp;
	UnionFind uf(n);
	REP(i, m) {
		int x, y;
		cin >> x >> y;
		x--; y--;
		uf.unite(x, y);
	}
	REP(i, n) {
		mp[uf.root(i)].push_back(a[i]);
	}
	ll ans = 0;
	vl tmp;
	for (auto b : mp) {
		sort(ALL(b.second), greater<int>());
		ans += b.second.back();
		b.second.pop_back();
		REP(i, b.second.size()) {
			tmp.push_back(b.second[i]);
		}
	}
	if (2 * (mp.size() - 1) > n) {
		cout << "Impossible" << endl;
		return 0;
	}
	sort(ALL(tmp));
	if (m == n - 1)cout << 0 << endl;
	else {
		REP(i, mp.size() - 2) {
			ans += tmp[i];
		}
		cout << ans << endl;
	}

	
	
	

}


Compiler output:
a.cc: In function 'int main()':
a.cc:91:17: error: 'sort' was not declared in this scope; did you mean 'short'?
   91 |                 sort(ALL(b.second), greater<int>());
      |                 ^~~~
      |                 short
a.cc:102:9: error: 'sort' was not declared in this scope; did you mean 'short'?
  102 |         sort(ALL(tmp));
      |         ^~~~
      |         short
Language: C++

#include <iostream>
#include <vector>
#include <set>
using namespace std;
 
typedef long long ll;
const int maxn = 1e5 *2* 10 + 10;
vector <ll> CONN[maxn];
ll a[maxn];
ll v[maxn],cv[maxn];
set<ll,less<ll>> cg;
 
void dfs(ll i){
    v[i] = 1;
    cg.insert(a[i]);
    for (ll j = 0;j < CONN[i].size();j++){
        if (v[CONN[i][j]]) continue;
        dfs(CONN[i][j],cg);
    }
}
 
 
 
int main() {
    ll N,M; cin >> N >> M;
    for (ll i = 0;i < N;i++){
        v[i] = 0;
        cin >> a[i];
    }
    for(ll i = 0;i < M;i++){
        ll x,y; cin >> x >> y;
        CONN[x].push_back(y);
        CONN[y].push_back(x);
    }
    vector <set<ll,less<ll>>> groups;
 
    for (ll i = 0;i < N;i++){
        if (v[i]) continue;
        cg.clear();
        dfs(i);
        groups.push_back(cg);
    }
    if (groups.size() == 1){
        cout << 0 << '\n';
        return 0;
    }
    set <ll,less<ll>> values;
    ll ans = 0;
    ll total_deg = 0;
    for (int i = 0;i < groups.size();i++){
        ans += *groups[i].begin();
        //cout << "Add " << *groups[i].begin() << '\n';
        groups[i].erase(groups[i].begin());
        total_deg ++;
    }
    for (ll i = 0;i < groups.size();i++){
        for (auto it = groups[i].begin();it != groups[i].end();++it){
            values.insert(*it);
        }
    }
 
   // cout << "gsize = " << groups.size() << '\n';
    while (total_deg < 2*(groups.size()-1) ){
 
        if (values.size() == 0) {
            cout << "Impossible\n";
            return 0;
        }
      //  cout << "add " << *values.begin() << '\n';
        ans += *values.begin(); values.erase(values.begin());
        total_deg ++;
    }
    cout << ans << '\n';
}

Compiler output:
a.cc: In function 'void dfs(ll)':
a.cc:18:12: error: too many arguments to function 'void dfs(ll)'
   18 |         dfs(CONN[i][j],cg);
      |         ~~~^~~~~~~~~~~~~~~
a.cc:13:6: note: declared here
   13 | void dfs(ll i){
      |      ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define int signed long long
#define MAX_N 1111111

int par[MAX_N]; 
int ran[MAX_N]; 

void init(int n){
  for(int i=0;i<n;i++){
    par[i]=i;
    ran[i]=0;
  }
}

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

void unite(int x,int y){
  x=find(x);
  y=find(y);
  if(ran[x]<ran[y])par[x]=y;
  else {
    par[y]=x;
    if(ran[x]==ran[y])ran[x]++;

  }
}

bool same(int x,int y){
  return find(x)==find(y);
}
typedef pair<int,int> P;
signed main(){
  int n,m;
  cin>>n>>m;
  init(n);
  vector<P> a;
  for(int i=0;i<n;i++){
    int t;
    cin>>t;
    a.push_back(P(t,i));
  }
  for(int i=0;i<m;i++){
    int x,y;
    cin>>x>>y;
    unite(x,y);
  }
  if(n-1>m+n/2)cout<<"Impossible"<<endl;
  else{
    int used[111111]={};
    sort(a.begin(),a.end());
    int cnt=0,ans=0,s=0,t=1;
    while(m+cnt<n-1){
      if(used[a[s].second]){
	s++;
	continue;
      }
      if(same(a[s].second,a[t].second)){
	t++;
	continue;
      }
      unite(a[s].second,a[t].second);
      ans+=a[s].first+a[t].first;
      used[a[s].second]=used[a[t].second]=1;
      s++;
      cnt++;
    }
    int f=0;
    for(int i=1;i<n;i++){
      if(!same(a[i].second,a[i-1].second))f=1;
    }
    int t=111111111;
    if(f)while(t--);
    else cout<<ans<<endl;
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:75:9: error: redeclaration of 'long long int t'
   75 |     int t=111111111;
      |         ^
a.cc:55:25: note: 'long long int t' previously declared here
   55 |     int cnt=0,ans=0,s=0,t=1;
      |                         ^