Best_Time_to_Buy_and_Sell_Stock

public class Solution {
    public int maxProfit(int[] prices) {
        if (prices == null || prices.length == 0) return 0;
        
        int min = Integer.MAX_VALUE; 
        int maxP = 0;
        for (int i : prices){
            min = i<min ? i:min;
            maxP = i-min > maxP ? i-min:maxP;
        }
        return maxP;
    }
}