#include <iostream>
using namespace std;
bool isLeapYear(int year) {
    return (year % 400 == 0) || (year % 4 == 0 && year % 100 != 0);
}
int main() {
    int year, month;
    cin >> year >> month;
    if (month == 2) {
        cout << (isLeapYear(year) ? 29 : 28) << endl;
    } else if (month == 4 || month == 6 || month == 9 || month == 11) {
        cout << 30 << endl;
    } else {
        cout << 31 << endl;
    }
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int year,mouth;
    cin>>year>>mouth;
    int _mouth[13]={31,28,31,30,31,30,31,31,30,31,30,31};
    if(year%100==0){
        if(year%400==0){
            _mouth[1]++;
        }
    }
    else {
        if(year%4==0){
            _mouth[1]++;
        }
    }
    cout<<_mouth[mouth-1];
    return 0;
}

某年某月

代码较少的题解

#include <bits/stdc++.h>
using namespace std;
int main()
{
int year,mouth;
cin>>year>>mouth;
int _mouth[13]={31,28,31,30

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