build

docs/chapter_sorting/selection_sort.md

@@ -306,7 +306,22 @@ comments: true
 === "Ruby"
 
     ```ruby title="selection_sort.rb"
-    [class]{}-[func]{selection_sort}
+    ### 选择排序 ###
+    def selection_sort(nums)
+      n = nums.length
+      # 外循环：未排序区间为 [i, n-1]
+      for i in 0...(n - 1)
+        # 内循环：找到未排序区间内的最小元素
+        k = i
+        for j in (i + 1)...n
+          if nums[j] < nums[k]
+            k = j # 记录最小元素的索引
+          end
+        end
+        # 将该最小元素与未排序区间的首个元素交换
+        nums[i], nums[k] = nums[k], nums[i]
+      end
+    end
     ```
 
 === "Zig"