Connect cities

n = input().split(" ")
m = int(n[1])
n = int(n[0])

roads = []
visited = [True]
adj = [[]]

for i in range(n):
    visited.append(False)
    adj.append([])

for i in range(m):
    r = input.split(" ")
    r[0] = int(r[0])
    r[1] = int(r[1])
    roads.append(r)
    adj[r[0]].append(r[1])


def dfs(s):
    if visited[s]:
        return
    visited[True]
    for c in adj[s]:
        dfs(c)

def finished():
    for c in visited:
        if c == False:
            return False
    return True

x = 0
for c in visited:
    if c == False:
        x += 1
        dfs(c)
print(x-1)

Test 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 4

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 5

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 6

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 7

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 8

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 9

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 10

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 11

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'

Test 12

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 14, in <module>
    r = input.split(" ")
AttributeError: 'builtin_function' object has no attribute 'split'