feat: two sum

Leetcode_labuladong/1.两数之和.go

@@ -0,0 +1,22 @@
+/*
+ * @lc app=leetcode.cn id=1 lang=golang
+ *
+ * [1] 两数之和
+ */
+
+// @lc code=start
+// 用一個map, key紀錄number的值, value 紀錄number的index
+// 遍歷整個nums,  判斷map中是否有 "target-number"存入map, 如果有就可以將 index從map取出, 並回傳
+func twoSum(nums []int, target int) []int {
+	m := make(map[int]int)
+	for i, v := range nums {
+		if j, ok := m[target-v]; ok {
+			return []int{j, i}
+		}
+		m[v] = i
+	}
+	return nil
+}
+
+// @lc code=end
+