题解 | #点击消除#
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https://www.nowcoder.com/practice/8d3643ec29654cf8908b5cf3a0479fd5
import sys
stack = []
for elems in sys.stdin:
for elem in elems.replace("\n", ""):
if not stack:
stack.append(elem)
elif stack[-1] == elem:
stack.pop()
else:
stack.append(elem)
if not stack:
print("0")
else:
print("".join(stack))