feat: add 0219 Two Sum solution

Author: hyogshin

two-sum/hyogshin.py

@@ -0,0 +1,14 @@
+class Solution:
+    def twoSum(self, nums: List[int], target: int) -> List[int]:
+        rs = []
+        for i in range(len(nums) - 1, -1, -1):
+            pair = target - nums[i]
+            if pair not in nums or i == nums.index(pair):
+                continue
+            idx = nums.index(pair)
+            if pair in nums:
+                rs.append(i)
+                rs.append(idx)
+                break
+        return rs        
+