Відповідь:

#include <iostream>

using namespace std;

int main() {

   int year;

   cout << "Enter a year: ";

   cin >> year;

   if (year % 4 == 0) {

       cout << "YES" << endl;

   } else {

       cout << "NO" << endl;

   }

   return 0;

}

#include <iostream>

using namespace std;

int main() {

   int grade;

   cout << "Enter your grade: ";

   cin >> grade;

   if (grade >= 1 && grade <= 3) {

       cout << "Initial level" << endl;

   } else if (grade >= 4 && grade <= 6) {

       cout << "Middle level" << endl;

   } else if (grade >= 7 && grade <= 9) {

       cout << "Sufficient level" << endl;

   } else if (grade >= 10 && grade <= 12) {

       cout << "High level" << endl;

   } else {

       cout << "Invalid grade" << endl;

   }

   return 0;

}

#include <iostream>

using namespace std;

int main() {

   int height, age;

   cout << "Enter your height (in cm): ";

   cin >> height;

   cout << "Enter your age: ";

   cin >> age;

   int weight = height % 100;

   if (age <= 25) {

       weight -= 5;

   } else if (age <= 45) {

       weight = weight;

   } else if (age <= 65) {

       weight += 5;

   } else {

       weight += 10;

   }

   cout << "Your ideal weight is " << weight << " kg" << endl;

   return 0;

}

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