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https://www.nowcoder.com/practice/8d3643ec29654cf8908b5cf3a0479fd5
#include <bits/stdc++.h>
using namespace std;
string str;
stack<char> s;
int main(){
cin>>str;
for(auto x : str){
if(s.size()&&s.top()==x) s.pop();
else s.push(x);
}
str = "";
while(s.size()) {
str.push_back(s.top());
s.pop();
}
if(str.size()==0) return cout<<0,0;
for(int i = str.size()-1;i>=0;i--) cout<<str[i];
return 0;
}
#牛客春招刷题训练营#https://www.nowcoder.com/discuss/727521113110073344
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