添加 0704.二分查找.md Scala版本

problems/0704.二分查找.md

@@ -610,7 +610,48 @@ public class Solution{
     }
 }
 ```
+**Scala:**
 
+（版本一）左闭右闭区间
+```scala
+object Solution {
+  def search(nums: Array[Int], target: Int): Int = {
+    var left = 0
+    var right = nums.length - 1
+    while (left <= right) {
+      var mid = left + ((right - left) / 2)
+      if (target == nums(mid)) {
+        return mid
+      } else if (target < nums(mid)) {
+        right = mid - 1
+      } else {
+        left = mid + 1
+      }
+    }
+    -1
+  }
+}
+```
+（版本二）左闭右开区间
+```scala
+object Solution {
+  def search(nums: Array[Int], target: Int): Int = {
+    var left = 0
+    var right = nums.length
+    while (left < right) {
+      val mid = left + (right - left) / 2
+      if (target == nums(mid)) {
+        return mid
+      } else if (target < nums(mid)) {
+        right = mid
+      } else {
+        left = mid + 1
+      }
+    }
+    -1
+  }
+}
+```
 
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