121. Best Time to Buy and Sell Stock

 1    public int maxProfit(int[] prices) {
 2         if(prices.length < 1) {
 3             return 0;
 4         }
 5         int minPrice = prices[0];
 6         int maxProfit = 0;
 7         for(int i = 1; i < prices.length; i++) {
 8             minPrice = (prices[i] < minPrice)? prices[i]: minPrice;
 9             maxProfit = (maxProfit < prices[i] - minPrice)? prices[i] - minPrice: maxProfit;
10         }
11         return maxProfit;
12     }