build

docs/chapter_searching/replace_linear_by_hashing.md

@@ -228,7 +228,17 @@ comments: true
 === "Ruby"
 
     ```ruby title="two_sum.rb"
-    [class]{}-[func]{two_sum_brute_force}
+    ### 方法一：暴力枚举 ###
+    def two_sum_brute_force(nums, target)
+      # 两层循环，时间复杂度为 O(n^2)
+      for i in 0...(nums.length - 1)
+        for j in (i + 1)...nums.length
+          return [i, j] if nums[i] + nums[j] == target
+        end
+      end
+
+      []
+    end
     ```
 
 === "Zig"
@@ -531,7 +541,19 @@ comments: true
 === "Ruby"
 
     ```ruby title="two_sum.rb"
-    [class]{}-[func]{two_sum_hash_table}
+    ### 方法二：辅助哈希表 ###
+    def two_sum_hash_table(nums, target)
+      # 辅助哈希表，空间复杂度为 O(n)
+      dic = {}
+      # 单层循环，时间复杂度为 O(n)
+      for i in 0...nums.length
+        return [dic[target - nums[i]], i] if dic.has_key?(target - nums[i])
+
+        dic[nums[i]] = i
+      end
+
+      []
+    end
     ```
 
 === "Zig"