View Compilation Error

391859_0_0_25789.cpp: In function `int main()':
391859_0_0_25789.cpp:32: error: `hash_map' undeclared (first use this function)
391859_0_0_25789.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
391859_0_0_25789.cpp:32: error: expected primary-expression before "int"
391859_0_0_25789.cpp:32: error: expected `;' before "int"
391859_0_0_25789.cpp:40: error: `m' undeclared (first use this function)