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Fix error about bit.md
author
Wrzz
<961337146@qq.com>
Fri, 13 Sep 2019 07:58:33 +0000
(15:58 +0800)
committer
GitHub
<noreply@github.com>
Fri, 13 Sep 2019 07:58:33 +0000
(15:58 +0800)
区间修改&区间查询算式错误
docs/ds/bit.md
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diff --git
a/docs/ds/bit.md
b/docs/ds/bit.md
index
ae2b27c
..
44297c7
100644
(file)
--- a/
docs/ds/bit.md
+++ b/
docs/ds/bit.md
@@
-90,7
+90,7
@@
int getsum(int x) { // a[1]……a[x]的和
}
```
-## 区间加区间求和
+## 区间
修改
加区间求和
若维护序列 $a$ 的差分数组 $b$ ,此时我们对 $a$ 的一个前缀 $r$ 求和,即 $\sum_{i=1}^{r} a_i$ ,由差分数组定义得 $a_i=\sum_{j=1}^i b_j$
@@
-132,7
+132,7
@@
void add1(int l, int r, int v) {
}
long long getsum1(int l, int r) {
- return (r + 1ll) *
(getsum(t1, r) - getsum(t1, l - 1)
) -
+ return (r + 1ll) *
getsum(t1, r) - 1ll * l * getsum(t1, l - 1
) -
(getsum(t2, r) - getsum(t2, l - 1));
}
```