def eliminar_medio(pilas):
o = Stack()
a = pilas.length() / 2
d = round(a)
for x in range(1, (d)):
u = pilas.pop()
o.push(u)
t = o.length()
f = pilas.pop()
for x in range(1, (t + 1)):
l = o.pop()
pilas.push(l)
return pilas.to_string()
def main3():
pila = Stack()
pila.push('R')
pila.push('A')
pila.push('N')
pila.push('I <--')
pila.push('M <--')
pila.push('I')
pila.push('L')
pila.push('E')
print("Pila sin eliminar datos, ELIMINAR")
pila.to_string()
print("Pila Nueva eliminando las letras de en medio que son M y I")
eliminar(pila, pila.length(), 0)
pila.to_string()
cuenta_regresiva(num)
def elim_pos_media(pila, size, curr):
if (pila.is_empty() or curr == size):
return
x = pila.peek()
pila.pop()
elim_pos_media(pila, size, curr + 1)
m = (size / 2)
if m == int(m):
if (curr != m and curr != (m - 1)):
pila.push(x)
else:
if (curr != int(size / 2)):
pila.push(x)
if __name__ == '__main__':
cuenta_regresiva(5)
pila = Stack()
pila.push(9)
pila.push(6)
pila.push(3)
pila.push(2)
print(pila.to_string())
l = pila.length()
elim_pos_media(pila, l, 0)