/*请务必运行以下程序后对照阅读*/ 
 
#include <set> 
#include <iostream> 
using namespace std; 
 
int main() 
{ 
  ///1. 初始化 
  set<int> num; 
  set<int>::iterator iter; 
  cout << num.max_size() << endl;///set容纳上限 
  cout << endl; 
 
  ///2. 添加元素 
  for (int i = 0; i < 10; i++) 
    num.insert(i); 
  cout << num.size() << endl; 
  cout << endl; 
 
  ///3. 遍历 
  ///不同于map，set容器不提供下标操作符 
  for (iter = num.begin(); iter != num.end(); iter++) 
    cout << *iter << " " ; 
  cout << endl; 
  cout << endl; 
 
  ///4. 查询 
  iter = num.find(1); 
  if (iter != num.end()) 
    cout << *iter << endl; 
  else 
    cout << -1 << endl; 
  iter = num.find(99); 
  if (iter != num.end()) 
    cout << *iter << endl; 
  else 
    cout << -1 << endl; 
  cout << endl; 
 
  ///5. 删除 
  iter = num.find(1); 
  num.erase(iter); 
  cout << num.size() << endl; 
  for (iter = num.begin(); iter != num.end(); iter++) 
    cout << *iter << " " ; 
  cout << endl; 
  cout << endl; 
 
  ///6. 判空与清空 
  if (!num.empty()) 
    num.clear(); 
}