Language: C++

#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx")
#include <bits/stdc++.h>
#define _GLIBCXX_DEBUG
using namespace std;
using ll = long long;
using vec = vector<ll>;
using vect = vector<double>;
using Graph = vector<vector<ll>>;
#define endl '\n'
#define loop(i, n) for (int i = 0; i < n; i++)
#define Loop(i, m, n) for (ll i = m; i < n; i++)
#define pool(i, n) for (ll i = n; i >= 0; i--)
#define Pool(i, m, n) for (ll i = n; i >= m; i--)
#define modd 1000000007ll
//#define modd 998244353ll
#define flagcount(bit) __builtin_popcount(bit)
#define flag(x) (1ll << x)
#define flagadd(bit, x) bit |= flag(x)
#define flagpop(bit, x) bit &= ~flag(x)
#define flagon(bit, i) bit &flag(i)
#define flagoff(bit, i) !(bit & (1ll << i))
#define all(v) v.begin(), v.end()
#define low2way(v, x) lower_bound(all(v), x)
#define high2way(v, x) upper_bound(all(v), x)
#define idx_lower(v, x) (distance(v.begin(), low2way(v, x)))  //配列vでx未満の要素数を返す
#define idx_upper(v, x) (distance(v.begin(), high2way(v, x))) //配列vでx以下の要素数を返す
#define idx_lower2(v, x) (v.size() - idx_lower(v, x))         //配列vでx以上の要素数を返す
#define idx_upper2(v, x) (v.size() - idx_upper(v, x))         //配列vでxより大きい要素の数を返す
#define putout(a) cout << a << '\n'
#define Sum(v) accumulate(all(v), 0ll)
ll ctoi(char c)
{
    if (c >= '0' && c <= '9')
    {
        return c - '0';
    }
    return -1;
}
template <typename T>
string make_string(T N)
{
    string ret;
    T now = N;
    while (now > 0)
    {
        T x = now % 10;
        ret += (char)('0' + x);
        now /= 10;
    }
    reverse(all(ret));
    return ret;
}
template <typename T>
T gcd(T a, T b)
{
    if (a % b == 0)
    {
        return (b);
    }
    else
    {
        return (gcd(b, a % b));
    }
}
template <typename T>
T lcm(T x, T y)
{
    T z = gcd(x, y);
    return x * y / z;
}
template <typename T>
bool primejudge(T n)
{
    if (n < 2)
        return false;
    else if (n == 2)
        return true;
    else if (n % 2 == 0)
        return false;
    double sqrtn = sqrt(n);
    for (T i = 3; i < sqrtn + 1; i++)
    {
        if (n % i == 0)
        {
            return false;
        }
        i++;
    }
    return true;
}
template <typename T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b; // aをbで更新
        return true;
    }
    return false;
}
template <typename T>
bool chmin(T &a, const T &b)
{
    if (a > b)
    {
        a = b; // aをbで更新
        return true;
    }
    return false;
}
//場合によって使い分ける
//const ll dx[4]={1,0,-1,0};
//const ll dy[4]={0,1,0,-1};
const ll dx[8] = {1, 1, 0, -1, -1, -1, 0, 1};
const ll dy[8] = {0, 1, 1, 1, 0, -1, -1, -1};
class FastIO
{
    static const int rdata_sz = (1 << 22), wdata_sz = (1 << 22);
    char rdata[rdata_sz], wdata[wdata_sz], *rb, *wb;
    char tmp_s[10];

public:
    FastIO()
    {
        fread(rdata, 1, rdata_sz, stdin);
        rb = rdata;
        wb = wdata;
    }
    ~FastIO()
    {
        fwrite(wdata, 1, wb - wdata, stdout);
    }

    template <typename T>
    inline void read(T &x)
    {
        bool neg = false;
        x = 0;
        while ((*rb < '0' || *rb > '9') && *rb != '-')
            ++rb;
        while ('0' <= *rb && *rb <= '9')
        {
            x = 10 * x + (*rb - '0');
            ++rb;
        }
        if (neg)
            x = -x;
    }

#define pc(x) *(wb++) = x
    template <typename T>
    inline void write(T x)
    {
        if (x == 0)
        {
            pc('0');
            pc(' ');
            return;
        }
        char *t = tmp_s;
        while (x)
        {
            T y = x / 10;
            *(t++) = (x - y * 10) + '0';
            x = y;
        }
        while (t != tmp_s)
            pc(*(--t));
        pc(' ');
    }
#undef pc
};
int par[500001];
int rank[500001];
//要素xが所属する木の根を再帰的に発見する
inline int root(int x)
{
    if (par[x] == x)
        return x;
    return par[x] = root(par[x]); //経路圧縮
}
//要素xが属する木と要素yが属する木の併合
inline void unite(int x, int y)
{
    int rx = root(x);
    int ry = root(y);
    if (rx == ry)
        return; //同じ木に属してたらそのまま
    if (rank[rx] < rank[ry])
    {
        par[rx] = ry; //根がryの木に併合
    }
    else
    {
        par[ry] = rx; //根がrxの木に併合
        if (rank[rx] == rank[ry])
            rank[rx]++;
    }
}
//要素xが属する木と要素yが属する木が同じならtrueを返す
inline bool same(int x, int y)
{
    return root(x) == root(y);
}
int main()
{
    FastIO io;
    int N, Q;
    io.read(N);
    io.read(Q);
    for (int i = 0; i < N; i++)
    {
        par[i] = i;
        rank[i] = 0;
    }
    for (int i = 0; i < Q; i++)
    {
        int a, b, c;
        io.read(a);
        io.read(b);
        io.read(c);
        if (a == 1)
            if (same(b, c))
                io.write(1);
            else
                io.write(0);
        if (a == 0)
            unite(b, c);
    }
    return 0;
}


Compiler output:
a.cc: In function 'void unite(int, int)':
a.cc:192:9: error: reference to 'rank' is ambiguous
  192 |     if (rank[rx] < rank[ry])
      |         ^~~~
In file included from /usr/include/c++/14/bits/stl_pair.h:60,
                 from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:5:
/usr/include/c++/14/type_traits:1437:12: note: candidates are: 'template<class> struct std::rank'
 1437 |     struct rank
      |            ^~~~
a.cc:177:5: note:                 'int rank [500001]'
  177 | int rank[500001];
      |     ^~~~
a.cc:192:20: error: reference to 'rank' is ambiguous
  192 |     if (rank[rx] < rank[ry])
      |                    ^~~~
/usr/include/c++/14/type_traits:1437:12: note: candidates are: 'template<class> struct std::rank'
 1437 |     struct rank
      |            ^~~~
a.cc:177:5: note:                 'int rank [500001]'
  177 | int rank[500001];
      |     ^~~~
a.cc:199:13: error: reference to 'rank' is ambiguous
  199 |         if (rank[rx] == rank[ry])
      |             ^~~~
/usr/include/c++/14/type_traits:1437:12: note: candidates are: 'template<class> struct std::rank'
 1437 |     struct rank
      |            ^~~~
a.cc:177:5: note:                 'int rank [500001]'
  177 | int rank[500001];
      |     ^~~~
a.cc:199:25: error: reference to 'rank' is ambiguous
  199 |         if (rank[rx] == rank[ry])
      |                         ^~~~
/usr/include/c++/14/type_traits:1437:12: note: candidates are: 'template<class> struct std::rank'
 1437 |     struct rank
      |            ^~~~
a.cc:177:5: note:                 'int rank [500001]'
  177 | int rank[500001];
      |     ^~~~
a.cc:200:13: error: reference to 'rank' is ambiguous
  200 |             rank[rx]++;
      |             ^~~~
/usr/include/c++/14/type_traits:1437:12: note: candidates are: 'template<class> struct std::rank'
 1437 |     struct rank
      |            ^~~~
a.cc:177:5: note:                 'int rank [500001]'
  177 | int rank[500001];
      |     ^~~~
a.cc: In function 'int main()':
a.cc:217:9: error: reference to 'rank' is ambiguous
  217 |         rank[i] = 0;
      |         ^~~~
/usr/include/c++/14/type_traits:1437:12: note: candidates are: 'template<class> struct std::rank'
 1437 |     struct rank
      |            ^~~~
a.cc:177:5: note:                 'int rank [500001]'
  177 | int rank[500001];
      |     ^~~~