121. Best Time to Buy and Sell Stock

public int maxProfit(int[] prices) {
if(prices.length < 1) {
return 0;
}
int minPrice = prices[0];
int maxProfit = 0;
for(int i = 1; i < prices.length; i++) {
minPrice = (prices[i] < minPrice)? prices[i]: minPrice;
maxProfit = (maxProfit < prices[i] - minPrice)? prices[i] - minPrice: maxProfit;
}
return maxProfit;
}