Update 二分查找详解.md

更新一些注释

算法思维系列/二分查找详解.md

@@ -537,19 +537,19 @@ def left_bound(nums, target):
     while left < right:
         mid = (left + right) // 2
         if nums[mid] == target:
-            # 锁定边界
+            # 锁定左侧边界
             right = mid
         elif nums[mid] < target:
             left = mid + 1
         elif nums[mid] > target:
             right = mid
-    # 检查越界情况
+    # 检查left越界情况
     if left >= len(nums) or nums[left] != target:
         return -1
     return left
 
 
-# 寻找右侧侧边界的二分搜索，开区间写法
+# 寻找右侧边界的二分搜索，开区间写法
 def right_bound(nums, target):
     left, right = 0, len(nums)
     if right == 0:
@@ -557,49 +557,49 @@ def right_bound(nums, target):
     while left < right:
         mid = (left + right) // 2
         if nums[mid] == target:
-            # 锁定边界
+            # 锁定右侧边界
             left = mid + 1
         elif nums[mid] < target:
             left = mid + 1
         elif nums[mid] > target:
             right = mid
     # 检查越界情况
-    if right < 0 or nums[left - 1] != target:
+    if left == 0 or nums[left - 1] != target:
         return -1
     return left - 1
 
 
-# 左右边界闭区间写法，统一逻辑
+# 寻找左侧边界的二分搜索，闭区间写法
 def left_bound(nums, target):
     left, right = 0, len(nums) - 1
     while left <= right:
         mid = (left + right) // 2
         if nums[mid] == target:
-            # 锁定边界
+            # 锁定左侧边界
             right = mid - 1
         elif nums[mid] < target:
             left = mid + 1
         elif nums[mid] > target:
             right = mid - 1
-    # 检查越界情况
+    # 检查left越界情况
     if left >= len(nums) or nums[left] != target:
         return -1
     return left
 
-
+# 寻找右侧边界的二分搜索，闭区间写法
 def right_bound(nums, target):
     left, right = 0, len(nums) - 1
     while left <= right:
         mid = (left + right) // 2
         if nums[mid] == target:
-            # 锁定边界
+            # 锁定右侧边界
             left = mid + 1
         elif nums[mid] < target:
             left = mid + 1
         elif nums[mid] > target:
             right = mid - 1
-    # 检查越界情况
+    # 检查right越界情况
     if right < 0 or nums[right] != target:
         return -1
     return right
-```
+```