Common Problem
If the input sequence of a stack is 12345, what is the output sequence of the stack?
If the input sequence of a stack is 12345, what is the output sequence of the stack?
The input sequence of a stack is 12345, and the output sequence of the stack is: 54321. The characteristic of the stack is "first in, last out"; it stores data according to the principle of first in, last out. The data that enters first is pushed to the bottom of the stack, and the last data is on the top of the stack. When data needs to be read, data is popped from the top of the stack (the last One data is read out first).
Stack (stack), also known as stack, is a linear table with limited operations. A linear table that restricts insertion and deletion operations only to the end of the table. This end is called the top of the stack, and the other end is called the bottom. Inserting a new element into a stack is also called pushing, pushing or pushing. It is to put the new element on top of the top element of the stack, making it a new top element; deleting elements from a stack is also called popping or pushing. Pop off the stack, which deletes the top element of the stack and makes its adjacent elements the new top element of the stack.
Stack, as a data structure, is a special linear table that can only perform insertion and deletion operations at one end. It stores data according to the principle of first in, last out. The data that enters first is pushed to the bottom of the stack, and the last data is on the top of the stack. When data needs to be read, data is popped from the top of the stack (the last data is read out first). The stack has a memory function. During insertion and deletion operations on the stack, there is no need to change the bottom pointer of the stack.
A stack is a special linear list that allows insertion and deletion operations at the same end. The end that allows insertion and deletion operations is called the top of the stack, and the other end is the bottom. The bottom of the stack is fixed, and the top of the stack floats. When the number of elements in the stack is zero, it is called an empty stack. Insertion is generally called PUSH, and deletion is called popping (POP). Stack is also called first-in-last-out list.
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