公众号

Author: wind-liang

book.json

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leetcode-307-Range-Sum-Query-Mutable.md

@@ -552,13 +552,13 @@ NumArray.prototype.sumRangeHelper = function (node, i, j) {
 
 `F[1,11] = V[11] + V[10] + V[8]`
 
-其中，`V[11] = F[11,11], V[10] = V[10,9], V[8]=F[8...1]`，为什么是这样？
+其中，`V[11] = F[11,11], V[10] = F[10,9], V[8]=F[8...1]`，为什么是这样？
 
 回到二进制，`F[0001,1011] = V[1011] + V[1010] + V[1000]`
 
 `1010 = 1011 - 0001`，`0001` 就是十进制的 `1`，所以 `V[1011]` 存 `1` 个数，所以 `V[11] = F[11,11]`。
 
-`1000 = 1010 - 0010`，`0010` 就是十进制的 `2`，所以 `V[1010]` 存 `2` 个数，所以 ` V[10] = V[10,9]`。
+`1000 = 1010 - 0010`，`0010` 就是十进制的 `2`，所以 `V[1010]` 存 `2` 个数，所以 ` V[10] = F[10,9]`。
 
 `0000 = 1000 - 1000`，`1000` 就是十进制的 `8`，所以 `V[1000]` 存 `8` 个数，所以 ` V[8] = F[8...1]`。