View Compilation Error

0_0_39147078_20693.cpp: In function 'long long int read()':
0_0_39147078_20693.cpp:21:20: error: 'amp' was not declared in this scope
   21 |     while(ch>='0' && ch<='9')
      |                    ^~~
0_0_39147078_20693.cpp:21:23: error: expected ')' before ';' token
   21 |     while(ch>='0' && ch<='9')
      |          ~            ^
      |                       )
0_0_39147078_20693.cpp:21:25: error: 'amp' was not declared in this scope
   21 |     while(ch>='0' && ch<='9')
      |                         ^~~
0_0_39147078_20693.cpp:21:37: error: expected ';' before ')' token
   21 |     while(ch>='0' && ch<='9')
      |                                     ^
      |                                     ;
0_0_39147078_20693.cpp: In function 'void dfs(long long int, long long int, long long int)':
0_0_39147078_20693.cpp:27:27: error: 'amp' was not declared in this scope
   27 |                 if((c>>i)&1)
      |                           ^~~