1047. 删除字符串中的所有相邻重复项

https://leetcode-cn.com/problems/remove-all-adjacent-duplicates-in-string/solution/cti-jie-by-tommy-22/
方法1
class Solution {
public:
    string removeDuplicates(string S) {
        stack T;
        for (int i=0;i        {
            if (T.empty())
                T.push(S[i]);
            else
            {
                if (T.top()==S[i])
                    T.pop();
                else
                    T.push(S[i]);
            }
        }
        
        string S1="";
        while(!T.empty())
        {
            S1.append(1,T.top());
            T.pop();
        }
        reverse(S1.begin(),S1.end());
        return S1;
    }
};