Скачать или смотреть Day 5- Implement two stacks in an array |PYTHON | GEEKSFORGEEKS|14 JULY

Your task is to implement 2 stacks in one array efficiently. You need to implement 4 methods.
push1 : pushes element into first stack.
push2 : pushes element into second stack.
pop1 : pops element from first stack and returns the popped element. If first stack is empty, it should return -1.
pop2 : pops element from second stack and returns the popped element. If second stack is empty, it should return -1.

Example 1:

Input:
push1(2)
push1(3)
push2(4)
pop1()
pop2()
pop2()
Output:
3 4 -1
Explanation:
push1(2) the stack1 will be {2}
push1(3) the stack1 will be {2,3}
push2(4) the stack2 will be {4}
pop1() the poped element will be 3 from stack1 and stack1 will be {2}
pop2() the poped element will be 4 from stack2 and now stack2 is empty
pop2() the stack2 is now empty hence returned -1.