Please see this code:

My first sub task was correct, but in the second subtask, 3 were correct and 2 were wrong, please help me

n=int(input())
x=[int(i) for i in input().split()]
if n==1:
 print(x[0])
elif n==2:
 print(min(x[0],x[1]))
else:
 cost2=[]
 cost1=[]
 cost1.append(x[0])
 cost1.append(x[0]+x[1])
 for i in range(2,n):
  cost1.append(x[i]+min(cost1[i-1],cost1[i-2]))
 x.append(x[0])
 x.pop(0)
 cost2.append(x[n-1])
 cost2.append(x[n-1]+x[n-2])
 for i in range(2,n):

please help with my code , I am getting WA.

n=int(input())
a=[int(i) for i in input().split()]
b=[]
def ram(x):
 m=x[0]
 k=0
 for i in range(2,n):
  if k==0:
    m+=min(x[i],x[i-1])
    if min(x[i],x[i-1]) ==x[i]:
     k=1
    else:
     k=0 
  else:
    k=0 
    continue
 return m 
for i in range(3):
 a.append(a[0])
 a.pop(0)
 b.append(ram(a))
print(min(b))

How to check the solution whether it is correct or not? Any link to debugger