#include<bits/stdc++.h>
using namespace std;

int cal_days(int year,int month,int day)
{
    int days[12]  = {31,28,31,30,31,30,31,31,30,31,30,31};
    int sum=0;
    sum += (year-1)*365;
    sum += year/4;
    sum -= year/100;
    sum += year/400;
    if((year%4==0 and year%100!=0)or year%400==0)
    {
        days[1]=29;
    }
    int i=month-2;
    while(i>=0){
        sum+=days[i];
        i--;
    }
    sum+=day;
    return sum;
}

int...