java: add “2706. Buy Two Chocolates”

Signed-off-by: Matej Focko <me@mfocko.xyz>

java/buy-two-chocolates.java

@@ -0,0 +1,21 @@
+class Solution {
+    public int buyChoco(int[] prices, int money) {
+        int[] mins = new int[2];
+        mins[0] = mins[1] = Integer.MAX_VALUE;
+        
+        for (int p : prices) {
+          if (p < mins[0]) {
+            mins[1] = mins[0];
+            mins[0] = p;
+          } else if (p < mins[1]) {
+            mins[1] = p;
+          }
+        }
+
+        int leftover = money - mins[0] - mins[1];
+        if (leftover < 0) {
+          return money;
+        }
+        return leftover;
+    }
+}