If the sequence of operations - push(1) push(2) pop push(1) push(2) pop pop pop push(2) pop are performed on a stack, the sequence of popped out values are ? Options 2 1 2 2 1 2 2 1 1 2 2 2 1 2 2
Question
If the sequence of operations - push(1) push(2) pop push(1) push(2) pop pop pop push(2) pop are performed on a stack, the sequence of popped out values are ?
Options 2 1 2 2 1
2 2 1 1 2
2 2 1 2 2
Solution
The sequence of operations performed on a stack are as follows:
- push(1): The stack now contains 1.
- push(2): The stack now contains 1, 2 (from bottom to top).
- pop: The top element, 2, is popped out. The stack now contains 1.
- push(1): The stack now contains 1, 1.
- push(2): The stack now contains 1, 1, 2.
- pop: The top element, 2, is popped out. The stack now contains 1, 1.
- pop: The top element, 1, is popped out. The stack now contains 1.
- pop: The top element, 1, is popped out. The stack is now empty.
- push(2): The stack now contains 2.
- pop: The top element, 2, is popped out. The stack is now empty.
So, the sequence of popped out values is 2, 2, 1, 1, 2. Therefore, the correct option is "2 2 1 1 2".
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