Linux下hash_map之类

#include <stdio.h>#include <string.h>#include <stdlib.h>#include <string>#include <iostream>using namespace std;/*#include <ext/hash_map>using namespace __gnu_cxx;struct str_hash{size_t operator()(const string& str) const{unsigned long __h = 0;for (size_t i = 0 ; i < str.size() ; i ++)__h = 5*__h + str[i];return size_t(__h);}};*/#include <unordered_map>using namespace std;int main(){/*hash_map<string, int, str_hash> h;string s1("111"), s2("222"), s3("333");h[s1] = 111;h[s2] = 222;h[s3] = 333;cout << h[s3] << h[s2] << h[s1] << endl; */unordered_map<string, int> h;return 0;}