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Fenwick Tree
Fshl0
Apr 1st, 2021
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C++
0.21 KB
| None
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void
upd
(
int
i,
int
val
)
{
for
(
;
i
<=
n
;
i
+
=
(
i
&
-
i
)
)
pre
[
i
]
+
=
val
;
return
;
}
int
get
(
int
i
)
{
int
res
=
0
;
for
(
;
i
>
0
;
i
-
=
i
&
(
-
i
)
)
res
+
=
pre
[
i
]
;
return
res
;
}
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