#include<bits/stdc++.h>
using namespace std;
void rl(int q){
	 int year=-4712,mon=1,day=1,month[]={29,31,28,31,30,31,30,31,31,30,31,30,31};
	 year+=q/1461;
	 for(int i=1;i<=q%1461;i++){
	 	if(abs(year)%4==0){month[2]==29;}else {month[2]==29;}
	 	day++;
		if(day>month[mon]){day=1;mon++;cout<<month[mon]<<" ";}
	 	if(mon>12){year++,mon=1;}		 
	 }
	
	if(year>1582){
	int run_nian=(year-1582)/400*3,yu_nian=((year-1582)%400)/100,yu=(year-1582)%100;
	if(yu>18)yu_nian++;
	yu_nian--;
	run_nian+=yu_nian;
	day-=run_nian;
	}
	 if(year>=1582)
	 if(mon>=10)
	 if(day>=5)
	 day+=10;
	 if(year<=0)year--;
	while(day>month[mon]){day-=mon;mon++;if(mon>12){mon-=12;year++;}}
	cout<<day<<" "<<mon<<" "<<abs(year);
	if(year<0)cout<<" "<<"BC"<<endl;else cout<<endl;
	return ;
}

int main(){
	int r,q;
	cin>>r;
	for(int i=1;i<=r;i++){
		//cin>>q;
		rl(i);//rl(q);
	}
	return 0;
}

就是这一段

 int year=-4712,mon=1,day=1,month[]={29,31,28,31,30,31,30,31,31,30,31,30,31};
	 year+=q/1461;
	 for(int i=1;i<=q%1461;i++){
	 	if(abs(year)%4==0){month[2]==29;}else {month[2]==29;}
	 	day++;
		if(day>month[mon]){day=1;mon++;cout<<month[mon]<<" ";}
	 	if(mon>12){year++,mon=1;}		 
	 }