/in/foo.cc: In function 'int main()':
/in/foo.cc:15:13: error: unable to find numeric literal operator 'operator""h'
    if(h1[i]>2h[j]&&h2[j]!=0&&visit[j]==1)
             ^~
/in/foo.cc:15:13: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes