poj 3393 Lucky and Good Months by Gregorian Calendar

http://poj.org/problem?id=3393

伤不起呀 题目也太长了吧

不过也学到了点常识

解释见代码注释

#include<iostream>
#include<cmath>
#include<string>
#include<algorithm>
#include<queue>
#include<cstring>
#include<cstdio>

using namespace std;
const int K=700000000;
int Days[15]={0,31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int Adddays(int ,int);
int Findwhichday(int year,int month)//求出 某年某月第一天是周几
{
    int Y=2006,M=7,Theday=6;//以 2006 年 7 月 第一天是 周六 为标准进行计算
    int sum=0;
    if(year<Y||(year==Y&&month<M))//分两种情况，所求时间在参考时间前还是后
    {
        while(year<Y||(Y==year&&month<M))
        {
            sum+=Adddays(year,month);
            ++month;
            if(month==13)
            {++year;month=1;}
        }
        return (Theday+K-sum)%7;
    }
    else
    {
        while(Y<year||(Y==year&&M<month))
        {
            sum+=Adddays(Y,M);
            ++M;
            if(M==13)
            {++Y;M=1;}
        }
        return (sum+Theday)%7;
    }
}
int Adddays(int year,int month)//判断某年某月为多少天
{
    if(year==1752&&month==9)
    return 19;
    if(month!=2)
    return Days[month];
    if(year<1582||year==1700)
    {
        if(year%4==0)
        return Days[month]+1;
        else
        return Days[month];
    }
    else
    {
        if(year%400==0||(year%4==0&&year%100!=0))
        return Days[month]+1;
        else
        return Days[month];
    }
}
int main()
{
    int Startyear,Startmonth;
    int Endyear,Endmonth;
    int T;
    scanf("%d",&T);
    while(T--)
    {
        int Luckmonth=0,Goodmonth=0;
        scanf("%d %d %d %d",&Startyear,&Startmonth,&Endyear,&Endmonth);
        int WhichDay=Findwhichday(Startyear,Startmonth);//开始年月分第一天为周几
        //cout<<WhichDay<<endl;
        while(Startyear<Endyear||(Startyear==Endyear&&Startmonth<=Endmonth))
        {
            if(WhichDay==1||WhichDay==0||WhichDay==6)
            {
                ++Goodmonth;
            }
            WhichDay+=Adddays(Startyear,Startmonth);
            if((WhichDay-1)%7==5||(WhichDay-1)%7==6||(WhichDay-1)%7==0)
            {
                ++Luckmonth;
            }
            WhichDay%=7;
            ++Startmonth;
            if(Startmonth==13)
            {
                Startmonth=1;
                ++Startyear;
            }
        }
        printf("%d %d\n",Luckmonth,Goodmonth);
    }
    return 0;
}