C++ set的初始化

set<T> s;
set<T> s(b, e);

arr,arr+sizeof(arr)/sizeof(*arr)

#include <iostream>
#include <set>

using namespace std;

int main(){
int arr[]={1,2,3,4,3,2,1};
int Num=5;
set<int> iset(arr,arr+sizeof(arr)/sizeof(*arr));
cout<<iset.size()<<endl;
if(iset.find(Num)!=iset.end())
cout<<*iset.find(searchNum)<<endl;//存在则返回该迭代器所指示的值
else
cout<<searchNum<<" not exist!"<<endl;
}