diff --git a/notes/算法.md b/notes/算法.md
index 488beede..2ddd1f1b 100644
--- a/notes/算法.md
+++ b/notes/算法.md
@@ -105,8 +105,8 @@ public class ThreeSumFast {
         while (l <= h) {
             int m = l + (h - l) / 2;
             if (target == nums[m]) return m;
-            else if (target > nums[m]) h = m - 1;
-            else l = m + 1;
+            else if (target > nums[m]) l = m + 1;
+            else h = m - 1;
         }
         return -1;
     }