在C ++中订单统计树 [英] Order Statistic Tree in C++

问题描述

我需要一个用于标准GCC STL地图容器的订单统计树。

I need an order statistic tree for standard GCC STL map containers.

我检查过，有一种称为PBDS的东西。基于策略的数据结构。任何人都可以告诉我如何使用STL地图容器进行订单统计树的使用。

I checked and there is something known as PBDS. Policy based data structures. That usage is also not clear to me.

即使它仅在GNU G ++上它足够？

Anyone can tell me how to use STL map containers for order statistic tree? Even if its only on GNU G++ its enough?

推荐答案

以下是以执行订单统计的GNU基于策略的STL MAP为例树（在Linux gcc 4.6.1上测试）：

Here is the example of GNU Policy-Based STL MAP implemented as order statistic tree (tested on Linux gcc 4.6.1):

#include <iostream>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef
tree<
  int,
  int,
  less<int>,
  rb_tree_tag,
  tree_order_statistics_node_update>
map_t;

int main()
{
  map_t s;
  s.insert(make_pair(12, 1012));
  s.insert(make_pair(505, 1505));
  s.insert(make_pair(30, 1030));
  cout << s.find_by_order(1)->second << '\n';
  return 0;
}

这里是链接到GNU基于政策的数据结构概述。以下是其他 tree_order_statistics示例。我找不到基于策略的数据结构的良好参考，但您可以使用这些链接以及PBDS源。

Here is a link to the overview of GNU Policy-Based Data Structures. Here is other tree_order_statistics example. I cannot find a good reference for Policy-Based Data Structures, but you can use these links as well as PBDS sources.

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