Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        if visited not in result:
            result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
print(len(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Runtime Error):
N, M = map(int, input().split())
A = []
B = []

for i in xrange(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)
for i in xrange(M):
    A.append(B[i])
    B.append(A[i])

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        if visited not in result:
            result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in xrange(2*M):
                if A[i] == start:
                    path(B[i], visited)
            visited.pop()

path(1, [])
print(len(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
A = []
B = []

for i in range(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)
for i in range(M):
    A.append(B[i])
    B.append(A[i])

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        if visited not in result:
            result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(2*M):
                if A[i] == start:
                    path(B[i], visited)
            visited.pop()

path(1, [])
print(len(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
A = []
B = []

for i in range(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)
for i in range(M):
    A.append(B[i])
    B.append(A[i])

result = []
stack = []

def path(start, visited):

    if len(visited) == N:
        if visited not in result:
            result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(2*M):
                if A[i] == start:
                    path(B[i], visited)
            visited.pop()

path(1, [])
print(len(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
A = []
B = []

for i in range(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)
for i in range(M):
    A.append(B[i])
    B.append(A[i])

result = []
stack = []

def path(start, visited):

    if len(visited) == N:
        if visited not in result:
            result.append(visited[:])
        exit
    stack.append(start)
    while len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint in visited:
            continue
        visited.append(nextpoint)
        for i in range(2*M):
            if A[i] == start:
                path(B[i], visited)
        visited.pop()

path(1, [])
print(len(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Time Limit Exceeded):
def lensetlist(A):
    B = []
    for i in A:
        if i not in B:
            B.append(i)
    return len(B)

N, M = map(int, input().split())
A = []
B = []

for i in range(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)
for i in range(M):
    A.append(B[i])
    B.append(A[i])

result = []
stack = []
ans = 0

def path(start, visited, count):
    count += 1
    if count > 10000:
        exit
    if len(visited) == N:
        result.append(visited[:])
        exit
    stack.append(start)
    while len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint in visited:
            continue
        visited.append(nextpoint)
        for i in range(2*M):
            if A[i] == start:
                path(B[i], visited, count)
        visited.pop()

path(1, [], 0)
print(lensetlist(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Runtime Error):
def lensetlist(A):
    B = []
    for i in A:
        if i not in B:
            B.append(i)
    return len(B)

N, M = map(int, input().split())
A = []
B = []

for i in range(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)
for i in range(M):
    A.append(B[i])
    B.append(A[i])

result = []
stack = []
ans = 0
count = 0
def path(start, visited):
    count += 1
    if count > 10000:
        break
    if len(visited) == N:
        result.append(visited[:])
        exit
    stack.append(start)
    while len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint in visited:
            continue
        visited.append(nextpoint)
        for i in range(2*M):
            if A[i] == start:
                path(B[i], visited)
        visited.pop()

path(1, [])
print(lensetlist(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Time Limit Exceeded):
def lensetlist(A):
    B = []
    for i in A:
        if i not in B:
            B.append(i)
    return len(B)

N, M = map(int, input().split())
A = []
B = []

for i in range(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)

used = [0 for i in range(N)]
result = []
stack = []
ans = 0
def path(start, visited):
    if len(visited) == N:
        result.append(visited[:])
        exit
    stack.append(start)
    while len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint in visited:
            continue
        visited.append(nextpoint)
        for i in range(M):
            if A[i] == start:
                path(B[i], visited)
            if B[i] == start:
                path(A[i], visited)
        visited.pop()

path(1, [])
print(lensetlist(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))

Buggy python submission (verdict: Time Limit Exceeded):
def lensetlist(A):
    B = []
    for i in A:
        if i not in B:
            B.append(i)
    return len(B)

N, M = map(int, input().split())
A = []
B = []

for i in range(M):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)

used = [0 for i in range(N)]
result = []
stack = []
ans = 0
def path(start, visited):
    if len(visited) == N:
        result.append(visited[:])
        exit
    stack.append(start)
    while len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint in visited:
            continue
        visited.append(nextpoint)
        for i in range(M):
            if A[i] == start:
                path(B[i], visited)
            if B[i] == start:
                path(A[i], visited)
        visited.pop()

path(1, [])
print(lensetlist(result))


Fixed submission:
N, M = map(int, input().split())
A = [list(map(int, input().split())) for i in range(M)]

result = []
stack = []

def path(start, visited):
    if len(visited) >= N:
        result.append(visited[:])
        exit
    stack.append(start)
    if len(stack) > 0:
        nextpoint = stack.pop()
        if nextpoint not in visited:
            visited.append(nextpoint)
            for i in range(M):
                if A[i][0] == start:
                    path(A[i][1], visited)
                if A[i][1] == start:
                    path(A[i][0], visited)
            visited.pop()

path(1, [])
result = list(map(list, set(map(tuple, result))))
print(len(result))