Stock Buy Sell to Maximize Profit

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions.

Given an array of integers representing stock price on a single day, find max profit that can be earned by 1 transaction.
So you need to find a pair (buyDay,sellDay) where buyDay < = sellDay and it should maximize the profit. For example:

Stock Buy Sell to Maximize Profit Algorithm

Lets say we have array arr[] of stock prices.
We will track two variables :`lowestPriceTillThatDay`and `maxProfit`.

• `lowestPriceTillThatDay` will be initialise to arr[0].
• Iterate over stock price array `arr`[]
• If `current element` is greater than `lowestPriceTillThatDay`
• calculate profit.
• If `profit` is greater than maxProfit then update the `maxProfit`.
• If `current element` is lesser than `lowestPriceTillThatDay`
• update `lowestPriceTillThatDay` with `current element`.
• We will get `maxProfit` in the end.

Java Program for Stock Buy Sell to Maximize Profit

When you run above program, you will get below output:

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