foo.cc: In function ‘int main()’:
foo.cc:6:24: error: ‘n’ was not declared in this scope
    6 |         for(int i=1;i<=n;i++;)
      |                        ^
foo.cc:6:29: error: expected ‘)’ before ‘;’ token
    6 |         for(int i=1;i<=n;i++;)
      |            ~                ^
      |                             )
foo.cc:6:30: error: expected primary-expression before ‘)’ token
    6 |         for(int i=1;i<=n;i++;)
      |                              ^
foo.cc:11:24: error: ‘n’ was not declared in this scope
   11 |         for(int i=1;i<=n;i++)
      |                        ^
foo.cc:5:21: warning: unused variable ‘x’ [-Wunused-variable]
    5 |         int a[2222],x;
      |                     ^