/in/foo.cc:18:20: error: extended character – is not valid in an identifier
   18 | for(int i=p-1;i>=0;–i)
      |                    ^
/in/foo.cc:19:18: error: extended character – is not valid in an identifier
   19 | for(int j=i;j>=0;–j)
      |                  ^
/in/foo.cc: In function 'bool dfs(int, int)':
/in/foo.cc:18:20: error: '\U00002013i' was not declared in this scope
   18 | for(int i=p-1;i>=0;–i)
      |                    ^~
/in/foo.cc:19:18: error: '\U00002013j' was not declared in this scope
   19 | for(int j=i;j>=0;–j)
      |                  ^~