set 学习笔记

/****************************************
* File Name: set.cpp
* Author: sky0917
* Created Time: 2014年06月 4日 18:47:22
****************************************/
#include <map>
#include <set>
#include <cmath>
#include <queue>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    vector<int> ivec;
    for (int i = 0; i != 10; ++i){
        ivec.push_back(i);
        ivec.push_back(i);
    }    
    set<int> iset(ivec.begin(), ivec.end());
    cout<<ivec.size()<<endl;
    cout<<iset.size()<<endl;
    
    set<string> iset2;
    iset2.insert("the");
    iset2.insert("and");
    iset2.insert("3");
    iset2.insert("1");
    iset2.insert("2");
    iset2.insert("2");
    cout<<"size of iset2 = "<<iset2.size()<<endl;    
     // set 元素删除
     iset2.erase("2");
    // 遍历 set
    for (set<string>::iterator it = iset2.begin(); it != iset2.end(); ++it){
        cout<<*it<<endl;
    }    
    
    pair<set<string>::iterator, bool> pa = iset2.insert("zz");    
    cout << *pa.first<<endl;

    // 查找元素
    if (iset.find(1) != iset.end()){
        cout<<"find "<<1<<endl;
    }    
    if (iset.count(2))
        cout<<"count 2: "<<1<<endl;
    if (iset.count(11) == 0)
        cout<<"count 11: "<<0<<endl;
     
    /* set 中的元素是不可以被修改的！
     * set<string>::iterator it = iset2.find("zz");
     * *it = "ss"; // error
     */
    
        
    return 0;
}