/in/foo.cc:4:7: error: 'maxn' does not name a type
 const maxn=0x3f3f3f3f;
       ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:18:17: error: 'maxn' was not declared in this scope
    if(f[j-1].d>=maxn)
                 ^~~~
/in/foo.cc:27:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(tmp.d<f[j].d||tmp.d==f[j].d&&tmp.e>f[j].e)
                     ~~~~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:31:13: error: 'maxn' was not declared in this scope
  if(f[k].d>=maxn)
             ^~~~