C++ 程序以在 STL 中实现 Set_Intersection
两个集合的交集仅由两个集合中公用的元素组成。函数复制的元素始终按相同顺序来自第一个集合。两个集合中的元素已经排列。
常见的集合运算有 −
- 集合并集
- 集合交集
- 对称集合差集或异或
- 集合差集或减法

算法
Begin Declare set vector v and iterator st. Initialize st = set_intersection (set1, set1 + n, set2, set2 +n, v.begin())) Print the intersection between two sets. End.
示例代码
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () {
int set1[] = {5,6,7,8,9,10};
int set2[] = {1,2,3,4,6,7};
vector<int> v(10);
vector<int>::iterator st;
sort (set1, set1 + 6);
sort (set2, set2 + 6);
st = set_intersection (set1, set1 + 6, set2, set2 + 6, v.begin());
v.resize(st - v.begin());
cout << "The intersection between the two set has " << (v.size()) << " elements: "<<endl;
for (st = v.begin(); st != v.end(); ++st)
cout<< *st<<" ";
cout <<endl;
return 0;
}输出
The intersection between the two set has 2 elements: 6 7
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