How should I practice Print Vertical Asterisk Bars?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Microsoft onsite interview problems in FastPrep.

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Print Vertical Asterisk Bars

Microsoft● EasyNEW GRADONSITE INTERVIEW

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Problem statement

Given an array of nonnegative bar heights, return a top-to-bottom text drawing of vertical bars.

Each output row contains exactly one character per input bar: * when that bar reaches the row and a space otherwise. Bars are bottom-aligned. Return an empty array when there are no positive heights.

Function

drawVerticalBars(heights: int[]) → String[]

Examples

Example 1

heights = [3,1,2]return = ["*  ","* *","***"]

The first bar reaches all three rows, the second reaches only the bottom row, and the third reaches the bottom two rows.

Example 2

heights = [0,0]return = []

No bar has positive height, so there are no rows to draw.

Constraints

0 <= heights.length <= 1000
0 <= heights[i] <= 1000