#121 - Best Time to Buy and Sell Stock

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Problem Description

You are given an array prices where prices[i] is the price of a given stock on the ith day.

You want to maximize your profit by choosing a single day to buy one stock and choosing a different day in the future to sell that stock.

Return the maximum profit you can achieve from this transaction. If you cannot achieve any profit, return 0.

Solution

/**
 * @param {number[]} prices
 * @return {number}
 */
var maxProfit = function(prices) {
  let max = 0;

  for (let i = 0, min = prices[0]; i < prices.length; i++) {
    min = Math.min(min, prices[i]);
    max = Math.max(max, prices[i] - min);
  }

  return max;
};