Submission #5403021

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Source Code Expand

import java.io.IOException;
import java.io.InputStream;
import java.util.*;
 
 
public class Main {
	
    public static void main(String[] args) {
    	FastScanner sc = new FastScanner();
    	
    	int n = sc.nextInt();
    	int q = sc.nextInt();
    	
    	UnionFindTree uf = new UnionFindTree(n);
    	
    	for(int i=0;i<q;i++){
    		
    		int p = sc.nextInt();
    		int a = sc.nextInt();
    		int b = sc.nextInt();
    		
    		
    		if(p==0){
    			uf.unite(a, b);
    		}
    		else{
    			if(uf.isEquivalent(a, b)){
    				System.out.println("Yes");
    			}
    			else{
    				System.out.println("No");
    			}
    		}
    	}
 
    }
    
}
 
class UnionFindTree {
	int[] par;
	int[] rank;
	int[] peers; //仲間の数
	
	public UnionFindTree(int n){
		par = new int[n];
		rank = new int[n];
		peers = new int[n];
		
		for(int i=0;i<n;i++){
			par[i] = i;
			peers[i] = 1;
		}
	}
	
	//木の根を求める
	int find(int x){
		if(par[x] == x){
			return x;
		}
		else{
			return par[x] = find(par[x]);
		}
	}
	
	//xとyの属する集合を併合
	void unite(int x, int y){
		int px = find(x);
		int py = find(y);
		
		if(px == py){
			return;
		}
		else if(rank[px] < rank[py]){
			peers[py] += peers[px];
			par[px] = py;
 
		}
		else{
			peers[px] += peers[py];
			par[py] = px;
			if(rank[px]==rank[py]){
				rank[px]++;
			}
		}
		
	}
	
	//xとyが同じ集合に属するか
	boolean isEquivalent(int x, int y){
		return find(x) == find(y);
	}
	
	//xの仲間の数を求める
	int peersnum(int x){
		return peers[find(x)];
	}
}
 
 
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}

Submission Info

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