/in/foo.cc: In function 'int main()':
/in/foo.cc:9:9: error: expected initializer before '==' token
  int cnt==0;
         ^~
/in/foo.cc:12:16: error: 'sum' was not declared in this scope
    if(sum(a,i,j)%k==0)
                ^
/in/foo.cc:13:5: error: 'cnt' was not declared in this scope
     cnt++;
     ^~~
/in/foo.cc:16:8: error: 'cnt' was not declared in this scope
  cout<<cnt;
        ^~~