Create remove_duplicated_items.md

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+---
+description: 删除有序数组中的重复项
+link: https://leetcode.cn/problems/remove-duplicates-from-sorted-array/description/
+rank: 1
+---
+
+```golang
+func removeDuplicates(nums []int) int {
+    count := len(nums)
+    if count <= 1 {
+        return count
+    }
+    duplicated := map[int]struct{}{} // using a map to find the duplicated item easily
+    for i := 0; i < len(nums); {
+        num := nums[i]
+        if _, ok := duplicated[num]; ok {
+            nums = append(nums[0:i], nums[i+1:]...)
+        } else {
+            duplicated[num] = struct{}{}
+            i++
+        }
+    }
+    return len(nums)
+}
+```