STL Set C++ 프로그램의 삽입 및 삭제

이 튜토리얼에서는 C++로 설정된 STL의 삽입과 삭제를 이해하는 프로그램에 대해 논의할 것입니다.

집합은 컨테이너 요소입니다. 고유하게 만드는 속성은 고유한 요소만 포함할 수 있고 정렬된 방식으로 반복될 수 있다는 것입니다.

예시

삽입

#include<iostream>
#include<set>
using namespace std;
int main(){
   set<int> st;
   //declaring iterators
   set<int>::iterator it = st.begin();
   set<int>::iterator it1, it2;
   pair< set<int>::iterator,bool> ptr;
   //inserting a single element
   ptr = st.insert(20);
   if (ptr.second)
      cout << "The element was newly inserted" ;
   else cout << "The element was already present" ;
      cout << "\nThe set elements after 1st insertion are : ";
   for (it1 = st.begin(); it1!=st.end(); ++it1)
      cout << *it1 << " ";
   st.insert(it, 24);
   cout << "\nThe set elements after 2nd insertion are : ";
   for (it1 = st.begin(); it1!=st.end(); ++it1)
      cout << *it1 << " ";
   int arr[3] = { 25, 24, 26 };
   st.insert(arr, arr+3);
   cout << "\nThe set elements after 3rd insertion are : ";
   for (it1 = st.begin(); it1!=st.end(); ++it1)
      cout << *it1 << " ";
}

출력

The element was newly inserted
The set elements after 1st insertion are : 20
The set elements after 2nd insertion are : 20 24
The set elements after 3rd insertion are : 20 24 25 26

삭제

#include<iostream>
#include<set>
using namespace std;
int main(){
   set<int> st;
   //declaring iterators
   set<int>::iterator it;
   set<int>::iterator it1;
   set<int>::iterator it2;
   pair< set<int>::iterator,bool> ptr;
   //inserting values in set
   for (int i=1; i<10; i++)
      st.insert(i*5);
   cout << "The set elements after insertion are : ";
   for (it1 = st.begin(); it1!=st.end(); ++it1)
      cout << *it1 << " ";
   it = st.begin();
   cout << endl;
   ++it;
   st.erase(it);
   //printing set elements after deletion
   cout << "The set elements after 1st deletion are : ";
   for (it1 = st.begin(); it1!=st.end(); ++it1)
      cout << *it1 << " ";
   st.erase(40);
   cout << "\nThe set elements after 2nd deletion are : ";
   for (it1 = st.begin(); it1!=st.end(); ++it1)
      cout << *it1 << " ";
   ++it;
   ++it;
   ++it;
   ++it;
   st.erase(it, st.end());
   cout << "\nThe set elements after 3rd deletion are : ";
   for (it1 = st.begin(); it1!=st.end(); ++it1)
      cout << *it1 << " ";
   cout << endl;
}

출력

The set elements after insertion are : 5 10 15 20 25 30 35 40 45
The set elements after 1st deletion are : 5 15 20 25 30 35 40 45
The set elements after 2nd deletion are : 5 15 20 25 30 35 45
The set elements after 3rd deletion are : 5 15 20