Best Time to Buy And Sell Stock (easy)

public class Solution {
    public static void main(String[] args) {
        System.out.println(maxProfit(new int[]{7,1,5,3,6,4})); // 5
        System.out.println(maxProfit(new int[]{7,6,4,3,1})); // 0
    }
    public static int maxProfit(int[] prices) {
        //
    }
}

public static int maxProfit(int[] prices) {
    int maxProfit = 0;
    int left = prices[0];
    
    for (int i = 1; i < prices.length; i++) {
        int current = prices[i];
        if (current < left) {
            left = current;
        } else {
            maxProfit = Math.max(current - left, maxProfit);
        }
    }
    
    return maxProfit;
}