:bug: fix typo

diff --git a/docs/math/bit.md b/docs/math/bit.md
index fd9d3b2..50b8a78 100644 (file)
--- a/docs/math/bit.md
+++ b/docs/math/bit.md
@@ -245,4 +245,3 @@ void swap(int &a, int &b) {
 ## 参考
 
 位运算技巧： <https://graphics.stanford.edu/~seander/bithacks.html> 
-$$