https://oj.leetcode.com/problems/best-time-to-buy-and-sell-stock/

Best Time to Buy and Sell Stock.java

public class Solution {
    public int maxProfit(int[] prices) {
        int ret = 0;
        if (prices.length <= 1) return 0;
        int min = prices[0];
        for (int i = 0; i < prices.length; i++) {
            min = Math.min(min, prices[i]);
            ret = Math.max(ret, prices[i] - min);
        }
        return ret;
    }
}