View Compilation Error

0_0_38826803_857.cpp: In function 'int main()':
0_0_38826803_857.cpp:21:36: error: 'amp' was not declared in this scope
   21 |                         if (is(j) && is(i - j))
      |                                    ^~~
0_0_38826803_857.cpp:21:44: error: expected ')' before ';' token
   21 |                         if (is(j) && is(i - j))
      |                            ~               ^
      |                                            )
0_0_38826803_857.cpp:21:55: error: expected ';' before ')' token
   21 |                         if (is(j) && is(i - j))
      |                                                       ^
      |                                                       ;