feat: support LaTex math equations

Author: yanglbme

index.html

@@ -10,8 +10,9 @@
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 </body>
 
 <!-- 

solution/0600-0699/0699.Falling Squares/README.md

@@ -83,19 +83,19 @@ _aa___a
 
 **方法一：线段树**
 
-线段树将整个区间分割为多个不连续的子区间，子区间的数量不超过 `log(width)`。更新某个元素的值，只需要更新 `log(width)` 个区间，并且这些区间都包含在一个包含该元素的大区间内。区间修改时，需要使用**懒标记**保证效率。
+线段树将整个区间分割为多个不连续的子区间，子区间的数量不超过 $log(width)$。更新某个元素的值，只需要更新 $log(width)$ 个区间，并且这些区间都包含在一个包含该元素的大区间内。区间修改时，需要使用**懒标记**保证效率。
 
 -   线段树的每个节点代表一个区间；
--   线段树具有唯一的根节点，代表的区间是整个统计范围，如 `[1, N]`；
--   线段树的每个叶子节点代表一个长度为 1 的元区间 `[x, x]`；
--   对于每个内部节点 `[l, r]`，它的左儿子是 `[l, mid]`，右儿子是 `[mid + 1, r]`, 其中 `mid = ⌊(l + r) / 2⌋` (即向下取整)。
+-   线段树具有唯一的根节点，代表的区间是整个统计范围，如 $[1, N]$；
+-   线段树的每个叶子节点代表一个长度为 1 的元区间 $[x, x]$；
+-   对于每个内部节点 $[l, r]$，它的左儿子是 $[l, mid]$，右儿子是 $[mid + 1, r]$, 其中 $mid = ⌊(l + r) / 2⌋$ (即向下取整)。
 
 对于本题，线段树节点维护的信息有：
 
-1. 区间中方块的最大高度 v
-1. 懒标记 add
+1. 区间中方块的最大高度 $v$
+1. 懒标记 $add$
 
-另外，由于数轴范围很大，达到 10^8，因此我们采用动态开点。
+另外，由于数轴范围很大，达到 $10^8$，因此我们采用动态开点。
 
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