View Compilation Error

0_0_8410293_4802.cpp:5:20: hash_map: No such file or directory
0_0_8410293_4802.cpp:21: error: expected constructor, destructor, or type conversion before '<' token
0_0_8410293_4802.cpp:21: error: expected `,' or `;' before '<' token
0_0_8410293_4802.cpp:22: error: expected constructor, destructor, or type conversion before '<' token
0_0_8410293_4802.cpp:22: error: expected `,' or `;' before '<' token
0_0_8410293_4802.cpp: In function `int mex()':
0_0_8410293_4802.cpp:57: error: `h' undeclared (first use this function)
0_0_8410293_4802.cpp:57: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8410293_4802.cpp:58: error: `sg' undeclared (first use this function)
0_0_8410293_4802.cpp: In function `int main()':
0_0_8410293_4802.cpp:90: error: `sg' undeclared (first use this function)
0_0_8410293_4802.cpp:91: error: `h' undeclared (first use this function)