View Compilation Error

0_0_33701698_10415.cpp: In function 'int main()':
0_0_33701698_10415.cpp:157:16: error: no matching function for call to 'graph::init()'
         g.init();
                ^
0_0_33701698_10415.cpp:157:16: note: candidate is:
0_0_33701698_10415.cpp:56:17: note: void graph::init(int)
     inline void init(int n) {
                 ^
0_0_33701698_10415.cpp:56:17: note:   candidate expects 1 argument, 0 provided