hash_map<string,int>

[jan_holmes]

I'm trying to solve a problem by implementing hash_map<string,int> stl in my program. But I got Compile Error many times.

This is the header that might result that compile error :

Code: Select all

#include <iostream>
#include <bitset>
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <cstring>
#include <vector>
#include <map>
#include <queue>
#include <deque>
#include <stack>
#include <cctype>
#include <set>
#include <cmath>
#include <climits>
#include <sstream>
#include <list>
#include <functional>
#include <utility>
#include <iomanip>
#include <ctime>
#include <ext/hash_map>


using namespace std;
using namespace __gnu_cxx;


namespace __gnu_cxx {
	template<> struct hash< std::string >{
		size_t operator()( const std::string& x ) const{
			return hash< const char* >()( x.c_str() );
		}
	};
}

Anyone can help ? Thx...

[Krzysztof Duleba]

The error message you're getting should be very straightforward, what part of it do you need help with?

Hint: hash_* aren't portable, so don't be surprised that you have to use a particular version of gcc to reproduce OJ's behaviour.

[jan_holmes]

thx for the explanation !!!

[DD]

You can the unordered_map in TR1 instead. It is convenient and easy to use.