日期模拟

#include <iostream>
#include <algorithm>
using namespace std;
int months[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int weekday[7];

int getyear(int year,int m){
    if(m!=2)return months[m];
    if(year%4==0 && year%100 || year%400==0)return 29;
    else return 28;
}
int main(){
    int n;
    cin>>n;
    int week=0;
    int year=1900,month=1,day=1;
    while(year<1900+n){
        if(day==13)weekday[week]++;
        week=(week+1)%7;
        day++;
        if(day>getyear(year,month)){
            day=1;
            month++;
        }
        if(month>12){
            month=1;
            year++;
        }
    }
    for(int i=5,j=0;j<7; j++,i=(i+1)%7){
        cout<<weekday[i]<<" ";
    }
    return 0;
}