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我试图理解boost::disjoint_sets_with_storage但即使是最简单的例子也不起作用,我不明白为什么。

#include <boost/pending/disjoint_sets.hpp>

int main(){
    boost::disjoint_sets_with_storage<> union_find;
    union_find.make_set(1);
    //..
}

上面的代码可以编译,但会产生段错误。我想使用整数作为元素,但在boost 文档中没有“元素”模板参数,所以我假设它推断类型。但是,问题是什么?谢谢

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1 回答 1

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我对使用它还不是 100% 有信心,但我得到了一个示例,我在这里尝试对其进行简化。我认为如果你可以简单地使用从 0 到 n-1 的整数,它们要么在同一个集合中,要么不在同一个集合中,我认为这是最简单的。

#include <iostream>
#include <boost/pending/disjoint_sets.hpp>
#include <vector>
typedef boost::disjoint_sets_with_storage<> Uf;

std::vector<pair<int,int>> same_set;
// fill the vector with number pairs between 0 and n-1 where
// n is the number of unique elements in the set
// ...
int n = ...; // n is the number of unique set elements

Uf union_find_set(n); // creates the structure with numbers 0 to n-1
// in seperate sets.  -> one set is for 0, one set for 1, ...

for (auto same : same_set) {
    union_find_set.union_set(same.first, same.second);
}
// union_find_set now contains sets with the numbers
// 0 to n-1 according to which sets should be combined
// given in the vector same_set.

// check whether two elements are in the same set, i.e. 0 and 2:
std::cout << union_find_set.find_set(0, 2);
于 2017-01-24T13:42:34.140 回答