【第13届蓝桥杯C/C++B组省赛】顺子日期

答案：14

1.数组办法解决

思路：前四个元素已经确定，分别枚举其他元素的合法性

#include <stdio.h>
int main()
{
	int a[8] = {2,0,2,0,0,0,0,0};
	int month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
	int i,j;
	int count = 0;
	for(i = 1;i <= 12;++i)
	{
		a[4] = i / 10;
		a[5] = i % 10;
		for(j = 1;j <= month[i];++j)
		{
			a[6] = j / 10;
			a[7] = j % 10;
			if((a[4]+1==a[5] && a[5]+1==a[6]) || (a[5]+1==a[6] && a[6]+1==a[7]))
			{
				count++;
			}
		}
	}
	printf("%d\n",count);
	return 0;
}

2.函数

思路：将每个简单功能封装成函数，提高代码复用性

#include<stdio.h>
int is_straight_number(int a,int b,int c)
{
	return (b == a + 1) && (c == b + 1);
}

int is_straight_date(int year,int month,int days)
{
  int date = year * 10000 + month * 100 + days;
  int first = (year * 10000000) % 10;
  int second = (year * 1000000) % 10;
  int third = (year * 100000) % 10;
  int fourth = (year * 10000) % 10;
  int fifth = (year * 1000) % 10;
  int sixth = (year * 100) % 10;
  int seventh = (year * 10) % 10;
  int eighth = year % 10;

  if(
    is_s_number(first,second,third) || 
    is_s_number(second,third,fourth)||
    is_s_number(third,fourth,fifth) || 
    is_s_number(fourth,fifth,sixth)||
    is_s_number(fifth,sixth,seventh)||
    is_s_number(sixth,seventh,eighth)
  )
  {
    return 1;
  }
  return 0;
}
int get_days_in_month(int month) 
{
  if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) 
  {
    return 31;
  }
  if (month == 4 || month == 6 || month == 9 || month == 11) 
  {
    return 30;
  }
  return 28;  
}
int main(int argc, char *argv[])
{
  int ans = 0;
  int month;
  int day;
  for(month = 1;month <= 12;++month)
  {
    int days = get_days_in_month(month);
    for(day = 1;day <= days;++day)
    {
      if(is_s_date(2022,month,day))
      {
        ans++;
      }
    }
  }
  printf("%d\n",ans);
  return 0;
}