View Compilation Error

0_0_18146948_26812.cpp: In function 'll init()':
0_0_18146948_26812.cpp:62:26: error: expected primary-expression before ')' token
  for (int i = 1;i < N;i+=)
                          ^
0_0_18146948_26812.cpp:67:26: error: 'mm' was not declared in this scope
         nG[len]=mm(ng,now);  
                          ^
0_0_18146948_26812.cpp: In function 'int init()':
0_0_18146948_26812.cpp:74:10: error: ambiguating new declaration of 'int init()'
 int init(){ 
          ^
0_0_18146948_26812.cpp:56:4: note: old declaration 'll init()'
 ll init(){ 
    ^