Problem:


  MathJax.Hub.Config({ tex2jax: { inlineMath: [["$","$"], ["\\(","\\)"]], processEscapes: true }});

Connected Components

  Write a program which reads relations in a SNS (Social Network Service), and judges that given pairs of users are reachable each other through the network.

Input

  In the first line, two integer $n$ and $m$ are given. $n$ is the number of users in the SNS and $m$ is the number of relations in the SNS. The users in the SNS are identified by IDs $0, 1, ..., n-1$.

  In the following $m$ lines, the relations are given. Each relation is given by two integers $s$ and $t$ that represents $s$ and $t$ are friends (and reachable each other).

  In the next line, the number of queries $q$ is given. In the following $q$ lines, $q$ queries are given respectively. Each query consists of two integers $s$ and $t$ separated by a space character.

Output

  For each query, print "yes" if $t$ is reachable from $s$ through the social network, "no" otherwise.

Constraints

$2 \leq n \leq 100,000$

$0 \leq m \leq 100,000$

$1 \leq q \leq 10,000$

Sample Input

10 9
0 1
0 2
3 4
5 7
5 6
6 7
6 8
7 8
8 9
3
0 1
5 9
1 3

Sample Output

yes
yes
no



Sample input:
10 9
0 1
0 2
3 4
5 7
5 6
6 7
6 8
7 8
8 9
3
0 1
5 9
1 3


Sample output:
yes
yes
no

Submission status: Runtime Error

Solution code:

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 = [0] * n
for i in range(n):
    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")

Submission status: Runtime Error

Solution code:
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)

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

A = [0] * n
for i in range(n):
    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]
        group_num = group_num + 1
        affil[i] = group_num
        BFS(i, group_num)

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")

Submission status: Runtime Error

Solution code:
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)

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

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

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")

Submission status: Runtime Error

Solution code:
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)

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]
        group_num = group_num + 1
        affil[i] = group_num
        BFS(i, group_num)

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")

Submission status: Runtime Error

Solution code:

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)

entry1 = map(int, raw_input())
n = entry1[0]
m = entry1[1]

A = range(n)
for i in A:
    A[i] = list()
for i in range(m):
    entry2 = map(int, raw_input())
    s = entry2[0]
    t = entry2[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]
        group_num = group_num + 1
        affil[i] = group_num
        BFS(i, group_num)

q = int(raw_input())
for i in range(q):
    entry3 = map(int, raw_input())
    if affil[entry3[0]] == affil[entry3[1]]:
        print("yes")
    else:
        print("no")

Submission status: Runtime Error

Solution code:

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)

entry = map(int, raw_input().split())
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().split())
    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]
        group_num = group_num + 1
        affil[i] = group_num
        BFS(i, group_num)

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

Submission status: Runtime Error

Solution code:
n, m = map(int, input().split())
g = [set() for _ in range(n)]

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


def find(s, t):
    global g
    visited = [0] * n

    def dfs(i):
        visited[i] = 1
        if i == t:
            return True
        for f in g[i]:
            if not visited[f]:
                if dfs(f):
                    return True
        return False

    return dfs(s)


q = int(input())
while q:
    s, t = map(int, input().split())
    print('yes' if find(s, t) else 'no')
    q -= 1

Submission status: Runtime Error

Solution code:
from collections import deque

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

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


def find(s, t):
    global g
    queue = deque()
    queue.append((0, s))
    queue.append((1, t))
    visited = (set(), set())
    visited[0].add(s)
    visited[1].add(t)

    def remember(visited, new):
        g[new] |= visited
        for v in visited:
            g[v].add(new)
        visited[new] = 1

    while queue:
        st, i = queue.popleft()
        for f in g[i]:
            if visited[not st][f]:
                return True
            if not visited[st][f]:
                remember(visited[st], f)
                queue.append((st, f))
    return False


q = int(input())
while q:
    s, t = map(int, input().split())
    print('yes' if find(s, t) else 'no')
    q -= 1

Submission status: Runtime Error

Solution code:
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)

entry = map(int, raw_input().split())
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().split())
    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]
        group_num = group_num + 1
        affil[i] = group_num
        BFS(i, group_num)

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

Submission status: Runtime Error

Solution code:
def DFS(s, j):
    group[s] = j
    for i in range(n):
        if i in G[s] and group[i] == 0:
            DFS(i, j)

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 = [0 for i in range(n)]
j = 1
for i in range(n):
    if group[i] == 0:
        DFS(i)
        j += 1

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

Submission status: Runtime Error

Solution code:
using namespace std;
int n,m;
vector<vector<int> > list(MAX);
int grp[MAX];
int group;
 
void dfs(int now){
    stack<int> next;
    grp[now]=group; next.push(now);
    while(!next.empty()){
        now=next.top(); next.pop();
        for(int i=0;i<(int)list[now].size();i++){
            if(grp[list[now][i]]==-1){
                grp[list[now][i]]=group;
                next.push(list[now][i]);
            }
        }
    }
}
 
int main(){
    cin>>n>>m;
    int s,t;
    for(int i=0;i<m;i++){
        cin>>s>>t;
        list[s].push_back(t);
        list[t].push_back(s);
    }
    for(int i=0;i<n;i++) grp[i]=-1;
    group=1;
    for(int i=0;i<n;i++){
        if(grp[i]==-1){
            dfs(i);
            group++;
        }
    }
    int q;  cin>>q;
    for(int i=0;i<q;i++){
        cin>>s>>t;
        if(grp[s]==grp[t])  cout<<"yes"<<endl;
        else    cout<<"no"<<endl;
    }
    return 0;

Submission status: Runtime Error

Solution code:
using namespace std;
int n,m;
vector<vector<int> > list(MAX);
int grp[MAX];
int group;
 
void dfs(int now){
    stack<int> next;
    grp[now]=group; next.push(now);
    while(!next.empty()){
        now=next.top(); next.pop();
        for(int i=0;i<(int)list[now].size();i++){
            if(grp[list[now][i]]==-1){
                grp[list[now][i]]=group;
                next.push(list[now][i]);
            }
        }
    }
}
 
int main(){
    cin>>n>>m;
    int s,t;
    for(int i=0;i<m;i++){
        cin>>s>>t;
        list[s].push_back(t);
        list[t].push_back(s);
    }
    for(int i=0;i<n;i++) grp[i]=-1;
    group=1;
    for(int i=0;i<n;i++){
        if(grp[i]==-1){
            dfs(i);
            group++;
        }
    }
    int q;  cin>>q;
    for(int i=0;i<q;i++){
        cin>>s>>t;
        if(grp[s]==grp[t])  cout<<"yes"<<endl;
        else    cout<<"no"<<endl;
    }
    return 0;
}

Submission status: Runtime Error

Solution code:
,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
 
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        while len(que) > 0:
            u = que[0]
            for v in graph[u]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1
 
 
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
x,y = map(int,raw_input().strip().split(' '))
follow = [[] for i in range(n)]
for i in range(y):
    h,c = map(int,raw_input().strip().split(' '))
    follow[h].append(c)
    follow[c].append(h)
 
color = {}
u = 0

for i in range(n):
    if not i in color:
        que = [i]
        color[i] = u
        while len(que) > 0:
            u = que[0]
            for v in follow[u]:
                if not v in color:
                    color[v] = u
                    que.append(v)
            del que[0]
        u += 1
 
 
q = int(raw_input())
for i in range(q):
    h,c = map(int,raw_input().strip().split(' '))
    if color[h] == color[c]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
x,y = map(int,raw_input().strip().split(' '))
follow = [[] for i in range(n)]
for i in range(y):
    h,c = map(int,raw_input().strip().split(' '))
    follow[h].append(c)
    follow[c].append(h)
 
color = {}
u = 0

for i in range(x):
    if not i in color:
        que = [i]
        color[i] = u
        while len(que) > 0:
            u = que[0]
            for v in follow[u]:
                if not v in color:
                    color[v] = u
                    que.append(v)
            del que[0]
        u += 1
 
 
q = int(raw_input())
for i in range(q):
    h,c = map(int,raw_input().strip().split(' '))
    if color[h] == color[c]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
 
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
         for j in range (m):
            u = que[0]
            for v in graph[u]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
 
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
         for j in range (n):
            u = que[0]
            for v in graph[u]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
 
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
         for j in range(n):
            u = que[0]
            for v in graph[u]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
 
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
       //  for j in range(len(que)):
            u = que[0]
            for v in graph[u]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1

Submission status: Runtime Error

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

Submission status: Runtime Error

Solution code:
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])

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
 s,t = map(int,raw_input().strip().split(' '))
 graph[s].append(t)
 graph[t].append(s)
color = {}
c = 0
for i in range(n):
 if not i in color:
  que = [i]
  color[i] = c
   if len(que) > 0:
    u = que[0]
    for v in graph[u]:
     if not v in color:
      color[v] = c
      que.append(v)
     del que[0]
   c += 1
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
 s,t = map(int,raw_input().strip().split(' '))
 graph[s].append(t)
 graph[t].append(s)
color = {}
c = 0
for i in range(n):
 if not i in color:
  que = [i]
  color[i] = c
   if len(que) > 0:
    u = que[0]
    for v in graph[u]:
     if not v in color:
      color[v] = c
      que.append(v)
     del que[0]
   c += 1
q = int(raw_input())
for i in range(q):
 s,t = map(int,raw_input().strip().split(' '))
 if color[s] == color[t]:
  print 'yes'
 else:
  print 'no'

Submission status: Runtime Error

Solution code:
def DFS(s):
    flag[s] = 1
    group[j] += 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

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

Submission status: Runtime Error

Solution code:
def DFS(s):
    flag[s] = 1
    group[j] += 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

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

q = int(input())
ans = ["no" for i in range(q)]
for i in range(q):
    s, t = map(int, input().split())
    for j in range(len(group)):
        if s in group[j] and t in gruop[j]:
            ans[i] = "yes"
for i in range(q):
    print(ans[i])

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
 
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
         for j in len(que):
        #while len(que) > 0:
            u[j] = que[0]
            for v in graph[u]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1
 
 
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
 
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
         for j in len(que):
        #while len(que) > 0:
            u[j] = que[0]
            for v in graph[u[j]]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1
 
 
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
def UF()
    int parent;
 
UF uf[100000]
 
def initialize(num)
  for i in num-1:
  uf[i].parent = i;

def find(a)
  if a == uf[a].parent:
    return a
  return uf[a].parent = find(uf[a].parent)
 
def isSame( a , b )
  if find(a) == find(b):
    return 1
  else:
    return 0;
    
def unite( a , b )
  a = find(a)
  b = find(b)
  if a == b:
    return
  uf[b].parent = a;

     
n = int( raw_input() )
m = int( raw_input() )
     
initialize(n)     
     
for i in m-1:
  u,v = map( int , raw_input().split() )
  unite(u, v)
     
q = int( raw_input() )     
     
for i in q-1:
  u,v = map( int , raw_input().split() )
  if (isSame(u, v)):
    printf "yes"
  else:
    printf "no"

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
        for j in len(que):
         if len(que) > 0:
        #while len(que) > 0:
            u[j] = que[0]
            for v in graph[u[j]]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
         for j in len(que):
          if len(que) > 0:
        #while len(que) > 0:
            u[j] = que[0]
            for v in graph[u[j]]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        if len(que) > 0:
         for j in range(len(que)):
          if len(que) > 0:
        #while len(que) > 0:
            u[j] = que[0]
            for v in graph[u[j]]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
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")

Submission status: Runtime Error

Solution code:
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] == group[t]:
        print("yes")
    else:
        print("no")

Submission status: Runtime Error

Solution code:
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):
    group.append([])
    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] = que.append(j)
            del que[0]
        c += 1

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

Submission status: Runtime Error

Solution code:
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] = que.append(j)
            del que[0]
        c += 1
    group.append([])

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

Submission status: Runtime Error

Solution code:
n,m = map(int,raw_input().strip().split(' '))
graph = [[] for i in range(n)]
for i in range(m):
    s,t = map(int,raw_input().strip().split(' '))
    graph[s].append(t)
    graph[t].append(s)
color = {}
c = 0
for i in range(n):
    if not i in color:
        que = [i]
        color[i] = c
        do len(que) > 0:
            u = que[0]
            for v in graph[u]:
                if not v in color:
                    color[v] = c
                    que.append(v)
            del que[0]
        c += 1
q = int(raw_input())
for i in range(q):
    s,t = map(int,raw_input().strip().split(' '))
    if color[s] == color[t]:
        print 'yes'
    else:
        print 'no'

Submission status: Runtime Error

Solution code:
import sys
sys.setrecursionlimit(200000)


def dfs(v, cnt):
    group[v] = cnt
    for c in edge[v]:
        if group[c] == -1:
            dfs(c, cnt)

V, E = map(int, input().split())
edge = [[] for _ in range(V)]
for _ in range(E):
    s, t = map(int, input().split())
    edge[s].append(t)
    edge[t].append(s)
group = [-1] * V
c = 0
for i in range(V):
    if group[i] == -1:
        dfs(i, c)
        c += 1

Q = int(input())
for _ in range(Q):
    s, t = map(int, input().split())
    print('yes' if group[s] == group[t] else 'no')

Submission status: Runtime Error

Solution code:
import sys
sys.setrecursionlimit(10**6)


def dfs(v, cnt):
    group[v] = cnt
    for c in edge[v]:
        if group[c] == -1:
            dfs(c, cnt)

V, E = map(int, input().split())
edge = [[] for _ in range(V)]
for _ in range(E):
    s, t = map(int, input().split())
    edge[s].append(t)
    edge[t].append(s)
group = [-1] * V
c = 0
for i in range(V):
    if group[i] == -1:
        dfs(i, c)
        c += 1

Q = int(input())
for _ in range(Q):
    s, t = map(int, input().split())
    print('yes' if group[s] == group[t] else 'no')

Submission status: Runtime Error

Solution code:
def dfs(u):
    global ct
    if color[u]!=-1:
        return
    color[u]=ct
    for v in fr[u]:
        if v!=-1 and color[v]==-1:
            dfs(v)
    color[u]=ct
    
n,m=map(int,raw_input().split())
fr=[[] for i in xrange(n)]
for i in xrange(m):
    s,t=map(int,raw_input().split())
    fr[s].append(t)
    fr[t].append(s)

q=input()
ct=0
color=[-1]*n
for i in xrange(n):
    dfs(i)
    ct+=1
for i in xrange(q):
    s,t=map(int,raw_input().split())
    if color[s]==color[t]:
        print('yes')
    else:
        print('no')

Submission status: Runtime Error

Solution code:
def dfs(u):
    global ct
    if color[u]!=-1:
        return
    color[u]=ct
    for v in fr[u]:
        if color[v]==-1:
            dfs(v)
    color[u]=ct
    
n,m=map(int,raw_input().split())
fr=[[] for i in xrange(n)]
for i in xrange(m):
    s,t=map(int,raw_input().split())
    fr[s].append(t)
    fr[t].append(s)

q=input()
ct=0
color=[-1]*n
for i in xrange(n):
    dfs(i)
    ct+=1
for i in xrange(q):
    s,t=map(int,raw_input().split())
    if color[s]==color[t]:
        print('yes')
    else:
        print('no')

Submission status: Runtime Error

Solution code:
import sys

def dfs(s, t):
    global V, d
    d[s] = 1

    if t in V[s]:
        return True

    for v in V[s]:
        if d[v] == 0:
            if dfs(v, t):
                return True

    return False

lines = sys.stdin.readlines()
n, m = map(int, lines[0].split())
V = [[] for _ in range(n)]
for i in range(1, m + 1):
    c = map(int, lines[i].split())
    V[c[0]].append(c[1])
    V[c[1]].append(c[0])

q = int(lines[m + 1])
for i in range(m + 2, m + q + 2):
    c = map(int, lines[i].split())
    d = [0] * (n)
    if dfs(c[0], c[1]):
        print "yes"
    else:
        print "no"