Navbatda birinchi va oxirgi elementlar o‘rni almashtirilsin

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1 - Variant

1. 
   Navbatda birinchi va oxirgi elementlar o‘rni almashtirilsin
   

#include
#include

using namespace std;

void swap_first_last(queue& q) {
// Check if the queue is empty.
if (q.empty()) {
return;
}

// Store the first element in a temporary variable.

int first_element = q.front();

// Remove the first element from the queue.

q.pop();

// Enqueue the first element at the end of the queue.

q.push(first_element);

// Remove the last element from the queue.

q.pop();

// Enqueue the temporary variable at the beginning of the queue.

q.push(first_element);
}

int main() {

// Create a queue.
queue q;

// Enqueue some elements.

q.push(1);
q.push(2);
q.push(3);

// Swap the first and last elements.

swap_first_last(q);

// Print the queue.

while (!q.empty()) {
cout << q.front() << " ";
q.pop();
}
cout << endl;

return 0;

}