A few interesting algorithms (Gauss Diary, the number of square, the rejuvenation of the new, reversed the price card) __ algorithm

1. Topic Title: Gauss Diary

Gauss, the great mathematician, has a good habit of keeping a diary in any case.

His diary has a different place, he never dated, but with an integer instead of, for example: 4210

Later, people knew that the whole number was a date, which means that it was the day after Gauss was born. It may also be a good habit to remind the owner: How much time can be wasted when the days go by.

Gauss was born in: April 30, 1777.

The diary of an important theorem in Gauss's discovery is labeled: 5343, so it can be calculated that day is: December 15, 1791.

Gauss got his Ph. D. Journal on the day marked: 8113

Please calculate the date of Gauss's doctorate.

The format for submitting the answer is: YYYY-MM-DD, for example: 1980-03-21

Please submit the answer in the browser in strict accordance with the format.
Note: Only submit this date, do not write additional content, such as: descriptive text.

Analysis: This is actually "Santian, two days problem".

Program implementation: (Java Write)[Java]  View plain copy package forth;      public class dateofndays {   /*   *  Gaussian Diary (given date, calculate the date of X days)    */       /*        *  is leap year        */        Boolean isleapyear (int year) {           return   (year % 400 == 0 | |  year % 4 == 0 && year % 100 != 0);       }              /*       *  get the maximum number of days of a certain month        */        int getmaxday (int year,int month,int day) {            switch (month) {    &NBsp;      case 1:            case 3:           case 5:            case 7:            case 8:           case 10:            case 12:                return 31;           case  4:           case 6:            case 9:           case  11:               return 30;    &NBsp;       case 2:                return  (Isleapyear (year) 29:28);            default:                return -1;           }        }       /*