View Compilation Error

0_0_36211666_19215.cpp: In function 'int main()':
0_0_36211666_19215.cpp:73:5: error: 'i' was not declared in this scope
   f(i,0,N){
     ^
0_0_36211666_19215.cpp:73:10: error: 'f' was not declared in this scope
   f(i,0,N){
          ^