AC代码 | 很简单，一做就会

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

bool is_leap(int n)
{
    if(n % 400 == 0 || n % 4 == 0 && n % 100 != 0)
    {
        return true;
    }
    return false;
}

int main()
{
    int n;
	cin >> n;
	if(is_leap(n) == true) 
    {
        cout << "Y" << endl;
    }else
    {
        cout << "N" << endl;
    }
   return 0;
}