杂模板

日期相隔天数计算

const int days=365;
const int s[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
bool Isleap(int y)
{
    if(y%400==0||y%100&&y%3==0)return 1;
    return 0;
}
int leap(int y)
{
    if(!y)return 0;
    return y/4-y/100+y/400;
}
int calc(int day,int mon,int year)
{
    int res=(year-1)*days+leap(year-1);
    for(int i=1;i<mon;++i)
        res+=s[i];
    if(Isleap(year)&&mon>2)res++;
    res+=day;
    return res;
}
int count_day(int da,int ma,int ya,int db,int mb,int yb)
{
    int resa=calc(da,ma,ya);
    int resb=calc(db,mb,yb);
    return abs(resa-resb);
}