题解 | #点击消除#
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https://www.nowcoder.com/practice/8d3643ec29654cf8908b5cf3a0479fd5
import sys
for line in sys.stdin:
s = list(line)[:-1]
stack=[]
for i in s:
if stack and stack[-1]==i:
stack.pop(-1)
else:
stack.append(i)
if stack==[]:
print(0)
else:
print(''.join(stack))
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