reformatDate.cpp

// Source: https://leetcode.com/problems/reformat-date/
// Author: Miao Zhang
// Date:   2021-05-12

class Solution {
public:
    string reformatDate(string date) {
        unordered_map<string, string> m{{"Jan", "01"},
                                        {"Feb", "02"},
                                        {"Mar", "03"},
                                        {"Apr", "04"},
                                        {"May", "05"},
                                        {"Jun", "06"},
                                        {"Jul", "07"},
                                        {"Aug", "08"},
                                        {"Sep", "09"},
                                        {"Oct", "10"},
                                        {"Nov", "11"},
                                        {"Dec", "12"}};
        stringstream ss(date);
        string day, month, year;
        ss >> day >> month >> year;
        day = day.substr(0, day.length() - 2);
        if (day.length() == 1) day = "0" + day;
        return year + "-" + m[month] + "-" + day;
    }
};