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Best Time to Buy and Sell Stocks I


Problem Description
<div id=problem_description_markdown_content_value style=”background-color: #f9f9f9; padding: 5px 10px; “>Say you have an array, A, for which the ith element is the price of a given stock on day i.<p></p>

If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit.

Return the maximum possible profit.

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Problem Constraints
<div id=problem_constraints_markdown_content_value style=”background-color: #f9f9f9; padding: 5px 10px; “>0 <= len(A) <= 7e5<p></p>

1 <= A[i] <= 1e7

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Input Format
<div id=input_format_markdown_content_value style=”background-color: #f9f9f9; padding: 5px 10px; “>The first and the only argument is an array of integers, A.</div>

Output Format
<div id=output_format_markdown_content_value style=”background-color: #f9f9f9; padding: 5px 10px; “>Return an integer, representing the maximum possible profit.</div>

Example Input
<div id=example_input_markdown_content_value style=”background-color: #f9f9f9; padding: 5px 10px; “>Input 1:<p></p>

A = [1, 2]

Input 2:

A = [1, 4, 5, 2, 4]

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Example Output
<div id=example_output_markdown_content_value style=”background-color: #f9f9f9; padding: 5px 10px; “>Output 1:<p></p>

1

Output 2:

4

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Example Explanation
<div id=example_explanation_markdown_content_value style=”background-color: #f9f9f9; padding: 5px 10px; “>Explanation 1:<p></p>

Buy the stock on day 0, and sell it on day 1.

Explanation 2:

Buy the stock on day 0, and sell it on day 2.

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NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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