Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 500001), 500000)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func main() {
	fp := os.Stdin
	if len(os.Args) > 1 {
		fp, _ = os.Open(os.Args[1])
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(os.Stdout)

	n := getNextInt(scanner)
	m := getNextInt(scanner)
	nodes := make([]Node, n)

	for i := 0; i < n; i++ {
		nodes[i].list = make([]int, 0)
	}

	for i := 0; i < m; i++ {
		s := getNextInt(scanner)
		t := getNextInt(scanner)
		nodes[s].list = append(nodes[s].list, t)
		nodes[t].list = append(nodes[t].list, s)
	}

	c := 1
	for i := 0; i < n; i++ {
		if nodes[i].c == 0 {
			traverse(nodes, i, c)
			c++
		}
	}

	q := getNextInt(scanner)

	for i := 0; i < q; i++ {
		s := getNextInt(scanner)
		t := getNextInt(scanner)
		if nodes[s].c == nodes[t].c {
			fmt.Fprintln(writer, "yes")
			continue
		}
		fmt.Fprintln(writer, "no")
	}

	writer.Flush()
}

// Node ...
type Node struct {
	list []int
	c    int
}

func traverse(nodes []Node, r, c int) {
	nodes[r].c = c
	for _, i := range nodes[r].list {
		if nodes[i].c != 0 {
			continue
		}
		traverse(nodes, i, c)
	}
}

Python: n, m = map(int, input().split())
rootList = [-1] * n

def getRoot(x):
    if rootList[x] < 0:
        return x
    rootList[x] = getRoot(rootList[x])
    return rootList[x]

def setSameRoot(x, y):
    x = getRoot(x)
    y = getRoot(y)
    if x != y:
        G[x], G[y] = min(x, y), min(x, y)

for i in range(0, m):
    s, t = map(int, input().split())
    setSameRoot(s, t)
q = int(input())
for i in range(0, q):
    s, t = map(int, input().split())
    print("yes" if getRoot(s) == getRoot(t) else "no")

Python: from collections import deque

n, m = map(int, input().split())
g = [set() for _ in range(n)]
gids = [0] * n

while m:
    s, t = map(int, input().split())
    g[s].add(t)
    g[t].add(s)
    m -= 1


def search(s, gid):
    global g, gids
    queue = deque()
    queue.append(s)
    visited = [0] * n
    visited[s] = 1
    gids[s] = gid

    while queue:
        i = queue.popleft()
        for f in g[i]:
            if not visited[f]:
                visited[f] = 1
                gids[f] = gid
                queue.append(f)


gid = 1
for i in range(n):
    if gids[i]:
        continue
    search(i, gid)
    gid += 1

print(gids)

q = int(input())
while q:
    s, t = map(int, input().split())
    gs, gt = gids[s], gids[t]
    print('yes' if gs and gt and gs == gt else 'no')
    q -= 1

Python: n, m = map(int, input().split())
G = [[] for j in range(n)]
for i in range(m):
    s, t = map(int, input().split())
    G[s].append(t)
    G[t].append(s)

group = {}
c = 0
for i in range(n):
    if not i in group:
        que = [i]
        group[i] = c
        while len(que) > 0:
            u = que[0]
            for j in G[u]:
                if not j in group:
                    group[j] = cque.append(j)
            del que[0]
        c += 1

q = int(input())
for i in range(q):
    s, t = map(int, input().split())
    if group[s] == grooup[t]:
        print("yes")
    else:
        print("no")

Python: def DFS(s):
    flag[s] = 1
    F.append(s)
    for i in range(n):
        if G[s] == i and flag[i] == 0:
                DFS(i)
 

n, m = map(int, input().split())
G = [[] for j in range(n)]
for i in range(m):
    s, t = map(int, input().split())
    G[s] += t
    G[t] += s

F = []
flag = [0 for i in range(n)]
group = 0
for i in range(n):
    if flag[i] == 0:
        F.append([])
        DFS(i)
        group += 1

q = int(input())
ans = ["no" for i in range(q)]
for i in range(q):
    s, t = map(int, input().split())
    for friends in F:
        if s in friends and t in friends:
            ans[i] = "yes"

for i in range(q):
    print(ans[i])

Python: def connected(G,s,t):
    checked = [False]*len(G)
    def main(G,s,t):
        if t in G[s]: return True
        checked[s] = True
        for f in G[s]:
            if checked[f]: continue
            if main(G,f,t): return True
        return False
    return main(G,s,t)


if __name__=='__main__':
    n,m = list(map(int,input().split()))
    G = [[] for _ in range(n)]
    for _ in range(m):
        s,t = list(map(int,input().split()))
        G[s].append(t)
        G[t].append(s)
    q = int(input())
    for _ in range(q):
        s,t = list(map(int,input().split()))
        print('Yes' if connected(G,s,t) else 'No')

Python: from sys import stdin
from collections import deque

def read_graph(n, k):
    A = [ [] for _ in range(n) ]
    for _ in range(k):
        line = stdin.readline().strip().split()
        A[int(line[0])].append(int(line[1]))
        A[int(line[1])].append(int(line[0]))
    return A

def bfs_ctrl(n, A, s, t):
    color = ["WHITE"] * n
    d = [-1] * n
    Q = deque([])

    def bfs(s):
        nonlocal color
        nonlocal d
        nonlocal Q
        color[s] = "GRAY"
        d[s] = 0
        Q.append(s)

        while Q:
            u = Q.popleft()
            for v in A[u]:
                if color[v] == "WHITE":
                    color[v] = "GRAY"
                    d[v] = d[u] + 1
                    Q.append(v)

            color[u] = "BLACK"

    bfs(s)
    if d[t] != -1:
        print("yes")
    else:
        print("no")

def read_and_print_connection(m):
    for _ in range(m):
        line = stdin.readline().strip().split()
        s = int(line[0])
        t = int(line[1])
        bfs_ctrl(n, A, s, t)

n, k = [int(i) for i in input().split()]
A = read_graph(n, k)
m = int(input())
read_and_print_connection(m)

Python: def bfs(graph, start, goal, connection):
    visited = {start: None}
    unvisited = [start]
    while unvisited:
        now = unvisited[0]
        if now == goal or (1000000*now + goal) in connection:
            connection[1000000*start + goal] = 1
            connection[1000000*goal + start] = 1
            return "yes"
        unvisited = unvisited[1:]
        for next in graph[now]:
            if not (next in visited):
                unvisited.append(next)
                visited[next] = now
    return "no"

n, m = map(int, input().split())
g = [[] for i in range(n)]
c = {}

for i in range(m):
    inp = list(map(int, input().split()))
    g[inp[0]].append(inp[1])
    g[inp[1]].append(inp[0])
    connection[1000000*inp[0] + inp[1]] = 1
    connection[1000000*inp[1] + inp[0]] = 1

q = int(input())

for i in range(q):
    s, t = map(int, input().split())
    print(bfs(g, s, t, c))

Python: def BFS(s = 0, group_num = 0):
    Q.pop(0)
    color[s] = 2
    for j in range(len(A[s])):
        if color[A[s][j]] == 0:
            Q.append(A[s][j])
            color[A[s][j]] = 1
            affil[A[s][j]] = group_num
    if len(Q) != 0:
        BFS(Q[0], group_num)
    return group_num

entry = map(int, raw_input())
n = entry[0]
m = entry[1]

A = range(n)
for i in A:
    A[i] = list()
for i in range(m):
    entry = map(int, raw_input())
    s = entry[0]
    t = entry[1]
    A[s].append(t)
    A[t].append(s)

color = [0] * n
affil = [0] * n
group_num = -1
for i in range(n):
    if color[i] == 0:
        Q = [i]
        affil[i] = group_num + 1
        group_num = BFS(i, group_num + 1)

q = int(raw_input())
for i in range(q):
    entry = map(int, raw_input())
    if affil[entry[0]] == affil[entry[1]]:
        print("yes")
    else:
        print("no")