feat: best-time-to-buy-and-sell-stock solution

Author: sm9171

best-time-to-buy-and-sell-stock/sm9171.java

@@ -0,0 +1,13 @@
+class Solution {
+    public int maxProfit(int[] prices) {
+        int maxProfit = 0;
+        int minPrice = prices[0];
+
+        for (int i = 0; i < prices.length; i++) {
+            int profit = prices[i] - minPrice;
+            maxProfit = Math.max(maxProfit, profit);
+            minPrice = Math.min(minPrice, prices[i]);
+        }
+        return maxProfit;
+    }
+}