feat(leetcode): new solutions

Author: jestenough

services/leetcode/problems/185-department-top-three-salaries/solution.sql

@@ -0,0 +1,16 @@
+WITH ranked AS (
+  SELECT
+    d.name  AS "Department",
+    e.name  AS "Employee",
+    e.salary AS "Salary",
+    DENSE_RANK() OVER (
+      PARTITION BY e.departmentId
+      ORDER BY e.salary DESC
+    ) AS rn
+  FROM Employee e
+  JOIN Department d ON d.id = e.departmentId
+)
+SELECT "Department","Employee","Salary"
+FROM ranked
+WHERE rn <= 3
+ORDER BY "Department"

services/leetcode/problems/196-delete-duplicate-emails/solution.sql

@@ -0,0 +1,2 @@
+DELETE FROM Person p1 USING Person p2
+WHERE p1.id > p2.id AND p1.email = p2.email;

services/leetcode/problems/7-reverse-integer/solution.py

@@ -0,0 +1,14 @@
+class Solution:
+    def reverse(self, x: int) -> int:
+        MAX_32 = 2 ** 31 - 1
+
+        sign = [1, -1][x < 0]
+        y, x = 0, abs(x)
+        while x > 0:
+            y *= 10
+            y += x % 10
+            if y > MAX_32:
+                return 0
+            x //= 10
+
+        return y * sign