View Compilation Error

0_0_34888528_7903.cpp: In function 'void NTT(int*, int)':
0_0_34888528_7903.cpp:13:15: error: 'l' was not declared in this scope
 #define mid ((l+r) >> 1)
               ^
0_0_34888528_7903.cpp:55:14: note: in expansion of macro 'mid'
     for (int mid = 1;
              ^
0_0_34888528_7903.cpp:13:17: error: 'r' was not declared in this scope
 #define mid ((l+r) >> 1)
                 ^
0_0_34888528_7903.cpp:55:14: note: in expansion of macro 'mid'
     for (int mid = 1;
              ^