Problem p02686 (python)

Fixed submission:
def main():
    n = int(input())
    if n == 0:
        print("Yes")
        return
    slup = []
    sldown = []
    for i in range(n):
        height, mi = 0, 0
        for si in input():
            if si == "(":
                height += 1
            else:
                height -= 1
                mi = min(mi, height)
        if height >= 0:
            slup.append([mi, height])
        else:
            sldown.append([mi-height, -height])

    slup.sort(reverse=True)
    sldown.sort(reverse=True)
    if sum([si[1] for si in slup]) + sum([-si[1] for si in sldown]):
        print("No")
        return
    h = 0
    for si in slup:
        if h+si[0] < 0:
            print("No")
            return
        h += si[1]
    h = 0
    for si in sldown:
        if h+si[0] < 0:
            print("No")
            return
        h += si[1]
    print("Yes")
        

if __name__ == "__main__":
    main()

Buggy submission (verdict: Runtime Error):
def main():
    n = int(input())
    if n%2:
        print("No")
        return
    sl = [None]*n
    for i in range(n):
        height, mi = 0, 0
        for si in input():
            if si == "(":
                height += 1
                mi = min(mi, height)
            else:
                height -= 1
                mi = min(mi, height)
            
        sl[i] = [mi, height]
    slup = [si for si in sl if si[1] >= 0]
    slup.sort(key = lambda x: -x[0])
    sldown = [si for si in sl if si[1] < 0]
    sldown.sort(key = lambda x: x[0])
    h = 0
    for si in slup:
        if h < 0 or h+si[0] < 0::
            print("No")
            return
        h += si[1]
    for si in sldown:
        if h < 0 or h+si[0] < 0:
            print("No")
            return
        h += si[1]
    if h == 0:
        print("Yes")
    else:
        print("No")
        

if __name__ == "__main__":
    main()

Buggy submission (verdict: Runtime Error):
def main():
    n = int(input())
    if n%2:
        print("No")
        return
    sl = [None]*n
    for i in range(n):
        height, mi = 0, 0
        for si in input():
            if si == "(":
                height += 1
                mi = min(mi, height)
            else:
                height -= 1
                mi = min(mi, height)
            
        sl[i] = [mi, height]
    slup = [si for si in sl if si[1] >= 0 and si[0] >= 0]
    slup.sort(key = lambda x: -x[1])
    slmiddle = [si for si in sl if si[i] >= 0 and si[0] < 0]
    slmiddle.sort(key = lambda x: x[0])
    sldown = [si for si in sl if si[1] < 0]
    sldown.sort(key = lambda x: x[0])
    h = 0
    for si in slup:
        if h < 0 :
            print("No")
            return
        h += si[1]
    for si in slmiddle:
        if h < 0 or h+si[0] < 0:
            print("No")
            return
        h += si[1]
    for si in sldown:
        if h < 0 or h+si[0] < 0:
            print("No")
            return
        h += si[1]
    if h == 0:
        print("Yes")
    else:
        print("No")
        

if __name__ == "__main__":
    main()

Buggy submission (verdict: Runtime Error):
def main():
    n = int(input())
    if n%2:
        print("No")
        return
    sl = [None]*n
    for i in range(n):
        height, mi = 0, 0
        for si in input():
            if si == "(":
                height += 1
                mi = min(mi, height)
            else:
                height -= 1
                mi = min(mi, height)
            
        sl[i] = [mi, height]
    sl.sort(key=lambda x: -x[0])
    slup = [si for si in sl if si[1] >= 0 and s[0] >= 0]
    sldown = [si for si in sl if si[1] < 0 or s[0] < 0]
    h = 0
    for si in slup:
        if h < 0 :
            print("No")
            return
        h += si[1]
    print(sldown)
    for si in sldown[::-1]:
        if h < 0 or h+si[0] < 0:
            print("No")
            return
        h += si[1]
    if h == 0:
        print("Yes")
    else:
        print("No")
        

if __name__ == "__main__":
    main()