题解 | #买卖股票的最好时机(一)#

import java.util.*;


public class Solution {
    /**
     * 
     * @param prices int整型一维数组 
     * @return int整型
     */
    public int maxProfit (int[] prices) {
        // write code here
        if (prices == null || prices.length < 2) {
            return 0;
        }
        int min = Integer.MAX_VALUE;
        int res = 0;
        for (int i = 0; i < prices.length; i++) {
            if (prices[i] < min) {
                min = prices[i];
            } else {
                res = Math.max(res, prices[i] - min);
            }
        }
        return res;
    }
}