LeetCode/java/best-time-to-buy-and-sell-stock.java

class Solution {
  public int maxProfit(int[] prices) {
    int buy = prices[0], profit = 0;
    for (var price : prices) {
      buy = Math.min(buy, price);
      profit = Math.max(profit, price - buy);
    }

    return profit;
  }
}