Excel表列名称

class Solution {
public:
    string convertToTitle(int n) {
        string ans;
        while(n>0){
            int t=n%26;
            n/=26;
            if(t){
                ans = string(1,‘A‘+t-1) + ans;
            }else{
                ans = string(1,‘Z‘) + ans;
                n--;
            }
        }
        return ans;
    }
};