Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
import sys
import math

def solve(N: int, A: "List[int]"):
    res = A[0]
    B = A[1:]
    for a in B:
        res = math.gcd(res,a)

    print(res)

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import math

def gcd(x,y):
    if y == 0:
        return x
    else:
        return gcd(y,x%y)

def solve(N: int, A: "List[int]"):
    res = A[0]
    B = A[1:]
    for a in B:
        res = gcd(res,a)

    print(res)

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
import sys
import math

def solve(N: int, A: "List[int]"):
    res = A[0]
    for a in A[1:]:
        res = math.gcd(res,a)
    print(res)

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import math

def gcd(x,y):
    if y == 0:
        return x
    else:
        return gcd(y,x%y)

def solve(N: int, A: "List[int]"):
    res = A[0]
    B = A[1:]
    for a in B:
        res = gcd(res,a)

    print(res)

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
import sys
import math
from functools import reduce

def solve(N: int, A: "List[int]"):
    res = A[0]
    for a in A[1:]:
        res = math.gcd(res,a)
    print(res)

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import math

def gcd(x,y):
    if y == 0:
        return x
    else:
        return gcd(y,x%y)

def solve(N: int, A: "List[int]"):
    res = A[0]
    B = A[1:]
    for a in B:
        res = gcd(res,a)

    print(res)

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
import sys
import math
from functools import reduce

def solve(N: int, A: "List[int]"):
    print(reduce(math.gcd,A))

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import math

def gcd(x,y):
    if y == 0:
        return x
    else:
        return gcd(y,x%y)

def solve(N: int, A: "List[int]"):
    res = A[0]
    B = A[1:]
    for a in B:
        res = gcd(res,a)

    print(res)

# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()