Practice Design a Stack With Increment Operation
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Design a Stack With Increment Operation
CustomStack(maxSize) starts empty with a fixed capacity. push(x) adds at the top only when capacity remains. pop() returns and removes the top or returns -1 when empty. increment(k, val) adds val to the bottom min(k, current size) entries. Practice approach: A direct array implementation increments the selected prefix in O(k). For constant-time operations, store a deferred increment at the highest affected position; when popping, transfer that increment to the position below. Capacity checks must not alter existing entries. Test increments larger than the current size and values inserted after an increment.
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Understanding the Design a Stack With Increment Operation Problem
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Problem Statement
CustomStack(maxSize) starts empty with a fixed capacity. push(x) adds at the top only when capacity remains. pop() returns and removes the top or returns -1 when empty. increment(k, val) adds val to the bottom min(k, current size) entries. Practice approach: A direct array implementation increments the selected prefix in O(k). For constant-time operations, store a deferred increment at the highest affected position; when popping, transfer that increment to the position below. Capacity checks must not alter existing entries. Test increments larger than the current size and values inserted after an increment.
Source: Design a Stack With Increment Operation on LeetCode. Use the original task for its coding environment and submissions.
Examples
# Example 1
["CustomStack","push","push","push","increment","pop","pop","pop"] [[2],[4],[7],[9],[5,3],[],[],[]]
[null,null,null,null,null,10,7,-1]
The full stack ignores push(9). Incrementing the bottom five affects both existing entries, changing [4,7] to [7,10].
Constraints
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