蓝桥杯2018-省赛-C/C++-A组2题

 1 /*
 2 1901年找不到 
 3 2000年12月31日为周日，反向求 
 4 */ 
 5 #include<iostream>
 6 #define ll long long 
 7 using namespace std;
 8 string week[7]={"Sun.","Sat.","Fri.","Thur.","Wen.","Tues.","Mon."};
 9 bool judge(int y){
10     if((y%400==0)||(y%100!=0&&y%4==0)){
11         return true;
12     }else
13         return false;
14 }
15 int main(){
16     int sta=1901;
17     int end=2001;
18     ll day=0;
19     for(int i=sta;i<end;i++){
20         if(judge(i)){
21             day+=366;
22         }else{
23             day+=365;
24         }
25     }
26     cout<<"day:"<<day<<endl;
27     cout<<week[(day-1)%7]<<endl;
28 }