Language: C++

//file_name:ABC49_D.cpp
#include <bits/stdc++.h>
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define rng(a) a.begin(),a.end()
#define maxs(x,y) (x = max(x,y))
#define mins(x,y) (x = min(x,y))
#define limit(x,l,r) max(l,min(x,r))
#define lims(x,l,r) (x = max(l,min(x,r)))
#define isin(x,l,r) ((l) <= (x) && (x) < (r))
#define pb push_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define uni(x) x.erase(unique(rng(x)),x.end())
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define show(x) cout<<#x<<" = "<<x<<endl;
#define PQ(T) priority_queue<T,v(T),greater<T> >
#define bn(x) ((1<<x)-1)
#define dup(x,y) (((x)+(y)-1)/(y))
#define newline puts("")
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
typedef long long int ll;
typedef unsigned uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
inline int in() { int x; scanf("%d",&x); return x;}
template<typename T>inline istream& operator>>(istream&i,v(T)&v)
{rep(j,sz(v))i>>v[j];return i;}
template<typename T>string join(const v(T)&v)
{stringstream s;rep(i,sz(v))s<<' '<<v[i];return s.str().substr(1);}
template<typename T>inline ostream& operator<<(ostream&o,const v(T)&v)
{if(sz(v))o<<join(v);return o;}
template<typename T1,typename T2>inline istream& operator>>(istream&i,pair<T1,T2>&v)
{return i>>v.fi>>v.se;}
template<typename T1,typename T2>inline ostream& operator<<(ostream&o,const pair<T1,T2>&v)
{return o<<v.fi<<","<<v.se;}
template<typename T>inline ll suma(const v(T)& a) { ll res(0); for (auto&& x : a) res += x; return res;}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame { puts("-1"); return 0;}
#define yn {puts("Yes");}else{puts("No");}
const int MX = 200005;

    // int scan
    /*
    int x;
    scanf("%d",&x);
    int y;
    scanf("%d",&y);
    int z;
    scanf("%d",&z);

    // matrix scan
    /*
    ll a[n] = {};
    rep(i,n){
        scanf("%lld",&a[i]);
    }
    */

    // string scan
    /*
    string s;
    cin >> s;
    */

// n要素で初期化
void init(int par[], int rank[], int n){
    for(int i=0;i<n;i++){
        par[i] = i;
        rank[i] = 0;
    }
}

// 木の根を求める
int find(int par[], int x){
    if(par[x] == x){
        return x;
    }else{
        return par[x] = find(par,par[x]);
    }
}

// xとyの属する集合を併合
void unite(int par[], int rank[], int x, int y){
    x = find(par,x);
    y = find(par,y);
    if(x == y) return;

    if(rank[x] < rank[y]){
        par[x] = y;
    }else{
        par[y] = x;
        if(rank[x] == rank[y]) rank[x]++;
    }
}

// xとyが同じ集合に属するか否か
bool same(int par[], int x, int y){
    return find(par,x) == find(par,y);
}

int main() {
    int n,k,l;
    cin >> n >> k >> l;
    int par1[n];
    int rank1[n];
    init(par1,rank1,n);

    rep(i,k){
        int a,b;
        cin >> a >> b;
        unite(par1,rank1,a-1,b-1);
    }

    int par2[n];
    int rank2[n];
    init(par2,rank2,n);

    rep(i,l){
        int a,b;
        cin >> a >> b;
        unite(par2,rank2,a-1,b-1);
    }

    vector<int> v;
    rep(i,n){
        v[find(par1,i)*n+find(par2,i)].push_back(i);
    }
    rep(i,n){
        cout << v[find(par1,i)*n+find(par2,i)].size() << ' ';
    }


    cout << endl;
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:139:40: error: request for member 'push_back' in 'v.std::vector<int>::operator[](((std::vector<int>::size_type)((find(((int*)(& par1)), i) * n) + find(((int*)(& par2)), i))))', which is of non-class type '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'}
  139 |         v[find(par1,i)*n+find(par2,i)].push_back(i);
      |                                        ^~~~~~~~~
a.cc:142:48: error: request for member 'size' in 'v.std::vector<int>::operator[](((std::vector<int>::size_type)((find(((int*)(& par1)), i) * n) + find(((int*)(& par2)), i))))', which is of non-class type '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'}
  142 |         cout << v[find(par1,i)*n+find(par2,i)].size() << ' ';
      |                                                ^~~~