View Compilation Error

0_0_39815285_5489.cpp: In function 'int main()':
0_0_39815285_5489.cpp:9:9: error: 'assert' was not declared in this scope
    9 |         assert(n <= 1000000);
      |         ^~~~~~
0_0_39815285_5489.cpp:3:1: note: 'assert' is defined in header '<cassert>'; did you forget to '#include <cassert>'?
    2 | #include <iomanip>
  +++ |+#include <cassert>
    3 |