magic3.cpp:4:22: error: hash_map.h: No such file or directory magic3.cpp:11: error: expected constructor, destructor, or type conversion before '<' token magic3.cpp: In function 'void read_data()': magic3.cpp:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result magic3.cpp:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result magic3.cpp: In function 'void generate(int, int)': magic3.cpp:22: error: 'h' was not declared in this scope magic3.cpp: In function 'void precompute()': magic3.cpp:51: error: 'hash_map' was not declared in this scope magic3.cpp:51: error: expected primary-expression before 'int' magic3.cpp:51: error: expected ';' before 'int' magic3.cpp:51: error: 'it' was not declared in this scope magic3.cpp:51: error: 'h' was not declared in this scope magic3.cpp: In function 'int main()': magic3.cpp:73: error: 'h' was not declared in this scope magic3.cpp:68: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result magic3.cpp:69: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result