Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
l = list(map(int,input().split()))
c = 0
while l.count(0)!=n:
  for i in range(n-1):
    if l[i]==0 and i!=n-2:
      continue
    elif l[i]==0 and i==n-2:
      c += 1
      l[n-1] -=1
    elif l[i]<=l[i+1] and i!=n-2:
      l[i] -= 1
    elif l[i]<=l[i+1] and i==n-2:
      l[i] -= 1
      l[i+1] -=1
      c += 1
    else:
      c += 1
      l[i] -= 1
      break
print(c)

Fixed submission:
n = int(input())
l = list(map(int,input().split()))
c = 0
if n==1:
  print(*l)
  exit()
while l.count(0)!=n:
  for i in range(n-1):
    if l[i]==0 and i!=n-2:
      continue
    elif l[i]==0 and i==n-2:
      c += 1
      l[n-1] -=1
    elif l[i]<=l[i+1] and i!=n-2:
      l[i] -= 1
    elif l[i]<=l[i+1] and i==n-2:
      l[i] -= 1
      l[i+1] -=1
      c += 1
    else:
      c += 1
      l[i] -= 1
      break
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
l = list(map(int,input().split()))
c = 1
for q in range(10000000):
  for i in range(n-1):
    if l[i]==0:
      continue
    elif l[i]<=l[i+1] and i!=n-2:
      l[i] -= 1
    elif l[i]<=l[i+1] and i==n-2:
      l[i] -= 1
      l[i+1] -=1
    else:
      c += 1
      l[i] -= 1
      break

print(c)

Fixed submission:
n = int(input())
l = list(map(int,input().split()))
c = 0
if n==1:
  print(*l)
  exit()
while l.count(0)!=n:
  for i in range(n-1):
    if l[i]==0 and i!=n-2:
      continue
    elif l[i]==0 and i==n-2:
      c += 1
      l[n-1] -=1
    elif l[i]<=l[i+1] and i!=n-2:
      l[i] -= 1
    elif l[i]<=l[i+1] and i==n-2:
      l[i] -= 1
      l[i+1] -=1
      c += 1
    else:
      c += 1
      l[i] -= 1
      break
print(c)

Buggy python submission (verdict: Runtime Error):
n = int(input())
l = [0]+list(map(int,input().split()))
s = 0
while len(set(l))!=1:
  for i in range(n+1):
    if l[i]==0:
      if l[i+1]==0:
          break
      for j in range(i+1,n+2):
        if l[j]!=0:
          l[j] -=1
          continue
        else:
          s += 1
          break
print(s)

Fixed submission:
n = int(input())
l = list(map(int,input().split()))
c = 0
if n==1:
  print(*l)
  exit()
while l.count(0)!=n:
  for i in range(n-1):
    if l[i]==0 and i!=n-2:
      continue
    elif l[i]==0 and i==n-2:
      c += 1
      l[n-1] -=1
    elif l[i]<=l[i+1] and i!=n-2:
      l[i] -= 1
    elif l[i]<=l[i+1] and i==n-2:
      l[i] -= 1
      l[i+1] -=1
      c += 1
    else:
      c += 1
      l[i] -= 1
      break
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
l = [0]+list(map(int,input().split()))+[0]
s = 0
while len(set(l))!=1:
  for i in range(n+1):
    if l[i]==0:
      if l[i+1]==0:
          break
      for j in range(i+1,n+2):
        if l[j]!=0:
          l[j] -=1
          continue
        else:
          s += 1
          break
print(s)


Fixed submission:
n = int(input())
l = list(map(int,input().split()))
c = 0
if n==1:
  print(*l)
  exit()
while l.count(0)!=n:
  for i in range(n-1):
    if l[i]==0 and i!=n-2:
      continue
    elif l[i]==0 and i==n-2:
      c += 1
      l[n-1] -=1
    elif l[i]<=l[i+1] and i!=n-2:
      l[i] -= 1
    elif l[i]<=l[i+1] and i==n-2:
      l[i] -= 1
      l[i+1] -=1
      c += 1
    else:
      c += 1
      l[i] -= 1
      break
print(c)