#include <stdio.h>

#include <map>

#include <string>

#include <iostream>

using namespace std;

int main(void)

{

????map<string, string> m;

????pair<string,string> p1("S","Shang Hai");

????pair<string,string> p2("B","Bei Jing");

????pair<string,string> p3("G","Guang Zhou");

????m.insert(p1);

????m.insert(p2);

????m.insert(p3);

????map<string,string>::iterator itor = m.begin();

????for( ; itor != m.end() ; itor++ )

????{

????????cout << itor->first << "-";

????????cout << itor->second << endl;

????}

????return 0;

}

為什么打印結果是

B-Bei Jing

G-Guang Zhou

S-Shang Hai

不應該是上海最先被打印出來嗎？