diff --git a/NeetCodeRoadmap/Arrays_and_Hashing/167_Two_Sum_II.py b/NeetCodeRoadmap/Arrays_and_Hashing/167_Two_Sum_II.py
index 8029abe..5c51d05 100644
--- a/NeetCodeRoadmap/Arrays_and_Hashing/167_Two_Sum_II.py
+++ b/NeetCodeRoadmap/Arrays_and_Hashing/167_Two_Sum_II.py
@@ -22,7 +22,39 @@ def twoSum(numbers, target):
             last -= 1
         else:
             last += 1
+# # two-pointer
+# def twoSum1(self, numbers, target):
+#     l, r = 0, len(numbers)-1
+#     while l < r:
+#         s = numbers[l] + numbers[r]
+#         if s == target:
+#             return [l+1, r+1]
+#         elif s < target:
+#             l += 1
+#         else:
+#             r -= 1
 
+# # dictionary           
+# def twoSum2(self, numbers, target):
+#     dic = {}
+#     for i, num in enumerate(numbers):
+#         if target-num in dic:
+#             return [dic[target-num]+1, i+1]
+#         dic[num] = i
+
+# # binary search        
+# def twoSum(self, numbers, target):
+#     for i in xrange(len(numbers)):
+#         l, r = i+1, len(numbers)-1
+#         tmp = target - numbers[i]
+#         while l <= r:
+#             mid = l + (r-l)//2
+#             if numbers[mid] == tmp:
+#                 return [i+1, mid+1]
+#             elif numbers[mid] < tmp:
+#                 l = mid+1
+#             else:
+#                 r = mid-1
 
 print(twoSum([2,7,11,15], 9))
 print(twoSum([-1,0], -1))