class Solution:
def removeDuplicates(self , s: str) -> str:
# write code here
stack = []
for x in s:
if not stack&nbs***bsp;stack[-1] != x:
stack.append(x)
else:
stack.pop()
return ''.join(stack)
class Solution:
def removeDuplicates(self , s: str) -> str:
# write code here
res = ''
for ch in s:
if res == '':
res += ch
elif ch == res[-1]:
res = res[:-1]
else:
res += ch
return res