View Compilation Error

0_0_11838475_25668.cpp: In function `bool check(long long int)':
0_0_11838475_25668.cpp:45: error: `DLX' has not been declared
0_0_11838475_25668.cpp:45: error: `Pre_DLX' undeclared (first use this function)
0_0_11838475_25668.cpp:45: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11838475_25668.cpp:47: error: `DLX' has not been declared
0_0_11838475_25668.cpp:47: error: `DLX_Link' undeclared (first use this function)
0_0_11838475_25668.cpp:53: error: `DLX' has not been declared
0_0_11838475_25668.cpp:54: error: `DLX' has not been declared
0_0_11838475_25668.cpp:56: error: `DLX' has not been declared
0_0_11838475_25668.cpp:56: error: `DLX_Dfs' undeclared (first use this function)