View Compilation Error

0_0_7049179_14798.cpp:3:20: hash_set: No such file or directory
0_0_7049179_14798.cpp:41: error: expected constructor, destructor, or type conversion before '<' token
0_0_7049179_14798.cpp:41: error: expected `,' or `;' before '<' token
0_0_7049179_14798.cpp: In function `void newNode(char*, eight*)':
0_0_7049179_14798.cpp:48: error: `used' undeclared (first use this function)
0_0_7049179_14798.cpp:48: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7049179_14798.cpp: In function `void productNode(eight*, int)':
0_0_7049179_14798.cpp:56: error: `used' undeclared (first use this function)