题解 | 计算一年中的第几天

#include<bits/stdc++.h>
using namespace std;
signed main(){
	int y,m,d;
	while(cin>>y>>m>>d){
		if(m>1) d+=31;
		if(m>2){
			if(y%400==0||(y%100)!=0&&y%4==0) d+=29;
			else d+=28;
		}
		if(m>3) d+=31;
		if(m>4) d+=30;
		if(m>5) d+=31;
		if(m>6) d+=30;
		if(m>7) d+=31;
		if(m>8) d+=31;
		if(m>9) d+=30;
		if(m>10) d+=31;
		if(m>11) d+=30;
		cout<<d<<"\n";
	}
	return 0;
}