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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| #include "FenwickTree.h" | ||
|
|
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| #include <iostream> | ||
|
|
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| int main(int argc, char* argv[]) | ||
| { | ||
| std::vector<std::size_t> data = { 1, 2, 3, 4, 5, 6, 7 }; | ||
| ds::fen_tree f(data.size()); | ||
| for (std::size_t i = 0; i < data.size(); ++i) | ||
| { | ||
| f.update_point(i + 1, data[i]); | ||
| } | ||
|
|
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| std::cout << f.sum(data.size()) << std::endl; | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
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|---|---|---|
| @@ -0,0 +1,22 @@ | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| #include "FenwickTree.h" |
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|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| #pragma once | ||
| #include <vector> | ||
|
|
||
| namespace ds | ||
| { | ||
| class fen_tree | ||
| { | ||
| public: | ||
| explicit fen_tree(const std::size_t size) :size_(size + 1) | ||
| { | ||
| f_.assign(size + 1, 0); | ||
| } | ||
|
|
||
| void update_point(std::size_t i, std::size_t value); | ||
| std::size_t sum(std::size_t i) const; | ||
| std::size_t range_sum(std::size_t i, std::size_t j) const; | ||
|
|
||
| private: | ||
| std::vector<std::size_t> f_; | ||
| std::size_t size_; | ||
| }; | ||
|
|
||
| inline void fen_tree::update_point(std::size_t i, const std::size_t value) | ||
| { | ||
| while (i < size_) | ||
| { | ||
| f_[i] += value; | ||
| i += i & -i; | ||
| } | ||
| } | ||
|
|
||
| inline std::size_t fen_tree::sum(std::size_t i) const | ||
| { | ||
| std::size_t s = 0; | ||
| while (i > 0) | ||
| { | ||
| s += f_[i]; | ||
| i -= i & -i; | ||
| } | ||
|
|
||
| return s; | ||
| } | ||
|
|
||
| inline std::size_t fen_tree::range_sum(std::size_t i, std::size_t j) const | ||
| { | ||
| return sum(j) - (i == 1 ? 0 : sum(i - 1)); | ||
| } | ||
| } |
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