题解 | 点击消除
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https://www.nowcoder.com/practice/8d3643ec29654cf8908b5cf3a0479fd5
s = input()
stack = []
for i in s:
if not stack :
stack.append(i)
else :
if stack[-1] == i :
stack.pop(-1)
else :
stack.append(i)
if not stack :
print(0)
else :
print("".join(stack))
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