leetcode 1507. Reformat Date 转变日期格式-耗时100

Problem: 1507. Reformat Date 转变日期格式

耗时100%，按照题意分割出 y, d, m，然后根据<10前面加一个0，month用到了哈希表

Code

class Solution { public: string reformatDate(string date) { unordered_map<string, int> ump={{"Jan",1}, {"Feb",2}, {"Mar",3}, {"Apr",4}, {"May",5}, {"Jun",6}, {"Jul",7}, {"Aug",8}, {"Sep",9}, {"Oct",10}, {"Nov",11}, {"Dec",12}}; int i = date.find(' '); string day = date.substr(0, i); date = date.substr(i + 1); i = date.find(' '); string month = date.substr(0, i); string year = date.substr(i + 1); int d = stoi(day.substr(0, (int)day.size()-2)); int m = ump[month]; int y = stoi(year); string mm = m < 10? "0"+to_string(m) : to_string(m); string dd = d < 10? "0"+to_string(d) : to_string(d); return to_string(y) + "-" + mm + "-" + dd; } };