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+1.Two sum
+Given nums = [2, 7, 11, 15], target = 9,
+
+Because nums[0] + nums[1] = 2 + 7 = 9,
+return [0, 1].
+
+##Python代码:
+class solution(object)
+  def twoSum(self,nums,target):
+	self.nums = nums
+	self.target = target
+	for indic, i in enumerate(self.nums):
+		for indic_b in range(indic + 1, len(nums)):
+			if (i + nums[indic_b] == self.target):
+				return ([indic, indic_b])
+
+##C++代码:使用哈希表,时间复杂度为o(n)