Leetcode 2259. Remove Digit From Number to Maximize Result

note：c++中数字组成的字符串可以直接比较大小

class Solution {
public:
    string removeDigit(string number, char digit) {
        string max_res = "";
        for(int i=0;i
            char d = number[i];
            if(d != digit) continue;
            string new_num = number.substr(0,i) + number.substr(i+1);
            if(max_res == "" || new_num > max_res){
                max_res = new_num;
            }
        }
        return max_res;
    }
};