Eroare de compilare: user.c:1:15: error: set: No such file or directory user.c:4: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'namespace' user.c:6: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token user.c: In function 'main': user.c:19: error: 'heap' undeclared (first use in this function) user.c:19: error: (Each undeclared identifier is reported only once user.c:19: error: for each function it appears in.) user.c:28: error: 'multiset' undeclared (first use in this function) user.c:28: error: expected expression before 'int' user.c:29: error: 'it' undeclared (first use in this function)