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| #include<iostream>
#include<string>
#include<algorithm>
using namespace std;
class SpString
{
friend SpString s_reverse(SpString t);
friend ostream& operator<<(ostream& cout,SpString k);
friend int Stoi(SpString t);
public:
void operator=(string t);
void operator++();
bool operator<=(string t);
SpString subs(int index,int len);
private:
string s;
};
SpString SpString::subs(int index,int len)
{
SpString t;
t=s.substr(index,len);
return t;
}
int Stoi(SpString t)
{
return stoi(t.s);
}
void SpString::operator++()
{
for(int i=s.length()-1;i>=0;--i)
{
s[i]++;
if(s[i]>'9'){
s[i]='0';
}
else
break;
}
}
SpString s_reverse(SpString t)
{
reverse(t.s.begin(),t.s.end());
SpString k;
k=t.s;
return k;
}
void SpString::operator=(string t)
{
s=t;
}
ostream& operator<<(ostream& cout,SpString k)
{
cout<<k.s;
return cout;
}
bool SpString::operator<=(string t)
{
return s<=t;
}
int isr(int year)
{
if(year%400==0||(year%100!=0&&year%4==0))
return 1;
return 0;
}
int main()
{
int month[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int cnt=0,j;
SpString s;
for(s="0001",j=1;s<="2021";++s,++j)
{
int b=isr(j);
month[2]=(b==1?29:28);
SpString tmp=s_reverse(s);
int t1=Stoi(tmp.subs(0,2)),t2=Stoi(tmp.subs(2,2));
if(t1<=12&&t1>0)
{
if(t2<=month[t1]&&t2>0)
{
cout<<++cnt<<" "<<s<<tmp<<endl;
}
}
}
return 0;
}
|