Class Solution
java.lang.Object
g2201_2300.s2280_minimum_lines_to_represent_a_line_chart.Solution
2280 - Minimum Lines to Represent a Line Chart\.
Medium
You are given a 2D integer array `stockPrices` where
stockPrices[i] = [dayi, pricei] indicates the price of the stock on day dayi is pricei. A **line chart** is created from the array by plotting the points on an XY plane with the X-axis representing the day and the Y-axis representing the price and connecting adjacent points. One such example is shown below:
Return _the **minimum number of lines** needed to represent the line chart_.
**Example 1:**
**Input:** stockPrices = \[\[1,7],[2,6],[3,5],[4,4],[5,4],[6,3],[7,2],[8,1]]
**Output:** 3
**Explanation:**
The diagram above represents the input, with the X-axis representing the day and Y-axis representing the price.
The following 3 lines can be drawn to represent the line chart:
- Line 1 (in red) from (1,7) to (4,4) passing through (1,7), (2,6), (3,5), and (4,4).
- Line 2 (in blue) from (4,4) to (5,4).
- Line 3 (in green) from (5,4) to (8,1) passing through (5,4), (6,3), (7,2), and (8,1).
It can be shown that it is not possible to represent the line chart using less than 3 lines.
**Example 2:**
**Input:** stockPrices = \[\[3,4],[1,2],[7,8],[2,3]]
**Output:** 1
**Explanation:** As shown in the diagram above, the line chart can be represented with a single line.
**Constraints:**
* 1 <= stockPrices.length <= 105
* `stockPrices[i].length == 2`
* 1 <= dayi, pricei <= 109
* All dayi are **distinct**.-
Constructor Summary
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Solution
public Solution()
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Method Details
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minimumLines
public int minimumLines(int[][] stockPrices)
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