Day3. Start Algorithm

121. Best Time to Buy and Sell Stock/Solution.cs

@@ -0,0 +1,27 @@
+namespace _121._Best_Time_to_Buy_and_Sell_Stock;
+
+public class Solution
+{
+    public int MaxProfit(int[] prices)
+    {
+        int min = prices[0];
+        int max = prices[0];
+        bool hasMax = false;
+        int res = 0;
+        foreach (int price in prices)
+        {
+            if (price > max || hasMax == false)
+            {
+                max = price;
+                hasMax = true;
+                res = Math.Max(max - min, res);
+            }
+            if (price < min)
+            {
+                min = price;
+                hasMax = false;
+            }
+        }
+        return res > 0 ? res : 0;
+    }
+}