日期集合

遍历两个日期之间的日期

#include <bits/stdc++.h>
using namespace std;
int main()
{
    for (int year = 2000; year <= 2020; year++)
    {
        for (int month = 1; month <= 12; month++)
        {
            for (int day = 1; day <= 31; day++)
            {
                if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
                {
                    ;
                }
                else if (month == 2)
                {
                    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
                    {
                        if (day > 29) break;
                    }
                    else
                    {
                        if (day > 28) break;
                    }
                }
                else
                {
                    if (day > 30)
                    {
                        break;
                    }
                }
                printf("%d-%02d-%02d\n", year, month, day);

            }
        }
    }
    return 0;
}

日期统计

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

int months[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

int a[100] = {
    5, 6, 8, 6, 9, 1, 6, 1, 2, 4, 9, 1, 9, 8, 2, 3, 6, 4, 7, 7,
    5, 9, 5, 0, 3, 8, 7, 5, 8, 1, 5, 8, 6, 1, 8, 3, 0, 3, 7, 9,
    2, 7, 0, 5, 8, 8, 5, 7, 0, 9, 9, 1, 9, 4, 4, 6, 8, 6, 3, 3,
    8, 5, 1, 6, 3, 4, 6, 7, 0, 7, 8, 2, 7, 6, 8, 9, 5, 6, 5, 6,
    1, 4, 0, 1, 0, 0, 9, 4, 8, 0, 9, 1, 2, 8, 5, 0, 2, 5, 3, 3
};


int main()
{
    int res = 0;

    for(int m = 1; m<=12; m++){
        for(int d = 1; d <= months[m]; d++){
            int s[8]={2, 0, 2, 3, m/10, m%10, d/10, d%10};
            int j=0;
            for(int i=0;i<100;i++){
                if(a[i]==s[j]){
                   j++; 
                   if(j==8){
                       res++;
                       break;
                   }
                }
            }
        }
    }
    cout << res;

    return 0;
}

日期差值

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

int a[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

int cal(int date)
{
    int y = date/10000;
    int m = date%10000/100;
    int d = date%10000%100;
    a[2] = (y%4==0&&y%100!=0||y%400==0?29:28);
    while (m -- )  d += a[m];

    while(y--) d+=(y%4==0&&y%100!=0||y%400==0?366:365);

    return d;
}

int main()
{
    int a, b;

    while(cin>>a>>b)cout<<abs(cal(a)-cal(b))+1<<endl;

    return 0;
}

顺子日期

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

int months[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

bool check_valid(int date)
{
    int y = date/10000;
    int m = date%10000/100;
    int d = date%10000%100;
    if(m<=0 || m>12) return false;
    if(d<=0 || m!=2 && d>months[m]) return false;
    if(m == 2)
    {
        if(y%4==0&&y%100!=0||y%400==0)
            months[2] = 29;
        if(d>months[2]) return false;
    }
    return true;
}

bool check(string s)
{
    for (int i = 0; i < s.size(); i ++ )
    {
        if(s[i] - '0' + 1 == s[i + 1] - '0' && s[i + 1] - '0' + 1 == s[i + 2] - '0')
            return true;
    }
    return false;
}

int main()
{
    int res = 0;

    for (int i = 20220101; i <= 20221231; i ++ )
    {
        if(check_valid(i))
        {
            string s = to_string(i);
            if(check(s))
                res++;
        }
    }
    cout << res;

    return 0;
}

某个日期是第几天

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

int months[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

int main()
{
    int y = 2000, m = 5, d = 4;
    int res = 0;

    if(y%4==0 && y%100!=0 || y%400==0)
        months[2] = 29;
    else
        months[2] = 28;

    for (int i = 1; i < m; i ++ )
        res += months[i];
    res += d;
    cout << res;

    return 0;
}

日期累加

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

int months[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

int main()
{
    int y = 2014, m = 11, d = 9, total = 1000;
    while(total--)
    {
        d ++;
        if(y%4==0 && y%100!=0 || y%400==0) 
            months[2] = 29;
        else
            months[2] = 28;
        if(d > months[m])
        {
            d = 1;
            m++;
        }
        if(m > 12)
        {
            m = 1;
            y++;
        }
    }
    printf("%d %d %d",y, m, d);
    return 0;
}

#include <iostream>

using namespace std;

const int months[13] = {
    0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};

int is_leap_year(int year) {
    if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
        return 1;
    return 0;
}

int days_of_month(int year, int month) {
    if(month == 2) return months[month] + is_leap_year(year);
    return months[month];
}

int main() {
    int T;
    cin >> T;

    for(int i = 0; i < T; i ++) {
        int y, m, d, a;
        cin >> y >> m >> d >> a;

        d += a;
        while(d > days_of_month(y, m)) {
            d -= days_of_month(y, m);
            m ++;
            if(m == 13) m = 1, y++;
        }

        printf("%4d-%02d-%02d\n", y, m, d);
    }

    return 0;
}