View Compilation Error

0_0_16305269_7587.cpp: In member function 'void DLX::init(int, int)':
0_0_16305269_7587.cpp:28:9: error: 'n' was not declared in this scope
         n = _n;
         ^
0_0_16305269_7587.cpp: In function 'int main()':
0_0_16305269_7587.cpp:120:17: error: no matching function for call to 'DLX::init(int&)'
         g.init(n);
                 ^
0_0_16305269_7587.cpp:120:17: note: candidate is:
0_0_16305269_7587.cpp:27:10: note: void DLX::init(int, int)
     void init(int _n, int _m){
          ^
0_0_16305269_7587.cpp:27:10: note:   candidate expects 2 arguments, 1 provided