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easy
Stack

Implement Queue using Stacks

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Implement Queue using Stacks** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** Two-stack lazy transfer on dequeue **Edge Cases to Consider:** - (1) Empty queue pop - (2) Alternate push/pop - (3) Single element

Examples

Example 1
Input: push(1); push(2); peek(); pop(); empty()
Output: 1; 1; false
Explanation: Classic
Example 2
Input: push(1); pop()
Output: 1
Example 3
Input: push(1); peek()
Output: 1

Constraints

  • ▪Input arguments are within valid ranges
  • ▪Optimize for execution speed
  • ▪Handle null/empty inputs gracefully

Watch Out For Edge Cases

  • ▪Empty queue pop
  • ▪Alternate push/pop
  • ▪Single element
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