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https://www.nowcoder.com/practice/8d3643ec29654cf8908b5cf3a0479fd5
#include <iostream>
#include <string>
using namespace std;
int main() {
string str;
cin >> str;//输入给定的字符串
string s;
for (int i = 0; i < str.size(); i++) {
if (s.empty()) {
s.push_back(str[i]);//将字符串插入s数组中
}
else {
if (s.back() == str[i]) //倒序比较
s.pop_back();
else if (s.back() != str[i])
s.push_back(str[i]);
}
}
if (s.empty()) {
cout << '0' << endl;
return 0;
}
cout << s << endl;
return 0;
}
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