蓝桥杯C++语言A1301高斯日记使用时间函数高效解决

    #include <iostream>
    #include <time.h>
    #include <iomanip>
    //	Suppose Gauss was born in 1777-04-30,
    //		and that day was denoted as 1 by him.
    //	For example, the relative day of 1791-12-15
    //		was represented as 5343.
    //
    //	What is the absolute day of 8113?
    //	Answer: 1799-07-16
    		struct tm start = {
    			.tm_sec=0,
    			.tm_min=0,
    			.tm_hour=0,
    			.tm_mday=30,
    			.tm_mon=4-1,
    			.tm_year=1777+400-1900,
    		};
    		start.tm_mday+=8113;
    		time_t start_all=mktime(&start);
    		tm * start_tmp=gmtime(&s