View Compilation Error

0_0_29296000_15653.cpp: In function 'int main()':
0_0_29296000_15653.cpp:30:6: error: 'll' was not declared in this scope
      ll mid=(l+r)/2;
      ^
0_0_29296000_15653.cpp:31:16: error: 'mid' was not declared in this scope
      if(a[j]+a[mid]>k)
                ^