Add python codes and for the chapter of

computational complexity.
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codes/python/chapter_computational_complexity/leetcode_two_sum.py

@@ -8,3 +8,34 @@ import sys, os.path as osp
 sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
 from include import *
 
+class SolutionBruteForce:
+    def twoSum(self, nums: List[int], target: int) -> List[int]:
+        for i in range(len(nums) - 1):
+            for j in range(i + 1, len(nums)):
+                if nums[i] + nums[j] == target:
+                    return i, j
+        return []
+
+class SolutionHashMap:
+    def twoSum(self, nums: List[int], target: int) -> List[int]:
+        dic = {}
+        for i in range(len(nums)):
+            if target - nums[i] in dic:
+                return dic[target - nums[i]], i
+            dic[nums[i]] = i
+        return []
+
+
+""" Driver Code """
+if __name__ == '__main__':
+    # ======= Test Case =======
+    nums = [ 2,7,11,15 ];
+    target = 9;
+    
+    # ====== Driver Code ======
+    # 方法一
+    res = SolutionBruteForce().twoSum(nums, target);
+    print(res)
+    # 方法二
+    res = SolutionHashMap().twoSum(nums, target);
+    print(res)