View Compilation Error

0_0_35364314_20457.cpp: In function 'int main()':
0_0_35364314_20457.cpp:6:7: error: 'N' was not declared in this scope
  cin>>N;
       ^
0_0_35364314_20457.cpp:21:17: error: invalid operands of types 'int [10007]' and 'int' to binary 'operator/'
     else if(b[a/2]>i&&b[a/2]<j){
                 ^
0_0_35364314_20457.cpp:21:27: error: invalid operands of types 'int [10007]' and 'int' to binary 'operator/'
     else if(b[a/2]>i&&b[a/2]<j){
                           ^