题目描述:给你一个日期,请你设计一个算法来判断它是对应一周中的哪一天。输入为三个整数:day、month 和 year,分别表示日、月、年。您返回的结果必须是这几个值中的一个 {“Sunday”, “Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”, “Saturday”}。
代码解析:基姆拉尔森计算公式
把一月和二月看成是上一年的十三月和十四月,例:如果是2004-1-10则换算成:2003-13-10来代入公式计算。
代码:
class Solution {
public:
string dayOfTheWeek(int day, int month, int year) {
if(month==1||month==2) month+=12,year--;
int iWeek=(day+2*month+3*(month+1)/5+year+year/4-year/100+year/400)%7;
string result[]={"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};
return result[iWeek];
}
};