题解 | (Prac)Go to the legisltive yuan在这立法典

#include <cstdio>
using namespace std;

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

bool is_leap(int year)
{
  return year % 400 == 0 || year % 4 == 0 && year % 100 != 0;
}

int get(int year, int month)
{
  if (month == 2)
    return 28 + is_leap(year);
  return days[month];
}

int main()
{
  int a, b, c;
  scanf("%d/%d/%d", &a, &b, &c);

  for (int i = 19600101; i <= 20591231; i++)
  {
    int year = i / 10000, month = i / 100 % 100, day = i % 100;
    if (month < 1 || month > 12)
      continue; // 月份不合法
    if (day < 1 || day > get(year, month))
      continue; // 天数不合法

    bool flag = false;
    if (year % 100 == a && month == b && day == c)
      flag = true; // 年/月/日
    if (month == a && day == b && year % 100 == c)
      flag = true; // 月/日/年
    if (day == a && month == b && year % 100 == c)
      flag = true; // 日/月/年

    if (flag)
      printf("%02d-%02d-%02d\n", year, month, day); // %02d：若不足两位，则补上前导0
  }

  return 0;
}