verify/yosupo/data-structure/unionfind.test.cpp

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Last update: 2025-03-14 23:36:46+07:00
Problem: https://judge.yosupo.jp/problem/unionfind

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Code

#define PROBLEM "https://judge.yosupo.jp/problem/unionfind"
#include "template.hpp"
#include "data-structure/dsu.hpp"

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    int n,q;
    cin >> n >> q;
    DSU dsu(n);
    while(q--){
        int t,u,v;
        cin >> t >> u >> v;
        if(t==0)dsu.merge(u,v);
        else cout << dsu.same(u,v) << "\n";
    }
}

#line 1 "verify/yosupo/data-structure/unionfind.test.cpp"
#define PROBLEM "https://judge.yosupo.jp/problem/unionfind"
#line 2 "template.hpp"
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

using ll = long long;
using db = long double;
using vi = vector<int>;
using vl = vector<ll>;
using vd = vector<db>;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using pdd = pair<db,db>;
const int INF=INT_MAX/2;
const int MOD=998244353;
const int MOD2=1000000007;
const ll LINF=LLONG_MAX/2;
const db DINF=numeric_limits<db>::infinity();
const db EPS=1e-9;
const db PI=acos(db(-1));

template<class T>
using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
template<class T>
using ordered_multiset = tree<T,null_type,less_equal<T>,rb_tree_tag,tree_order_statistics_node_update>;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count());
#line 2 "data-structure/dsu.hpp"

/**
 * Author: Teetat T.
 * Date: 2024-06-28
 * Description: Disjoint Set Union.
 */

struct DSU{
    vector<int> p,sz;
    DSU(){}
    DSU(int n){init(n);}
    void init(int n){
        p.resize(n);
        iota(p.begin(),p.end(),0);
        sz.assign(n,1);
    }
    int find(int u){
        return p[u]==u?u:p[u]=find(p[u]);
    }
    bool same(int u,int v){
        return find(u)==find(v);
    }
    bool merge(int u,int v){
        u=find(u),v=find(v);
        if(u==v)return false;
        sz[u]+=sz[v];
        p[v]=u;
        return true;
    }
    int size(int u){
        return sz[find(u)];
    }
};

#line 4 "verify/yosupo/data-structure/unionfind.test.cpp"

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    int n,q;
    cin >> n >> q;
    DSU dsu(n);
    while(q--){
        int t,u,v;
        cin >> t >> u >> v;
        if(t==0)dsu.merge(u,v);
        else cout << dsu.same(u,v) << "\n";
    }
}