蓝桥杯2020年第十一届国赛真题-天干地支

解题思路:把庚子年作为开始年，每过60年一个循环

注意事项:正年数与负年数方向不一样（2019 是己亥年 2021是辛丑年）都与2020差一年

参考代码:

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <string>
using namespace std;

string tian_gan[10]={"geng","xin","ren","gui","jia","yi","bing","ding","wu","ji"};
string di_zi[12]={"zi","chou","yin","mao","chen","si","wu","wei","shen","you","xu","hai"};

int main()
{
	int y,n;
	cin>>y;
	n=(y-2020)%60;
	if(n>=0)  // 如果年数是正整数从前往后找
		cout<<tian_gan[n%10]<<di_zi[n%12]<<endl;
	else      // 负整数从后往前找
		cout<<tian_gan[10+n%10]<<di_zi[12+n%12]<<endl;
	return 0;
}