foo.cc: In function 'int sb(int, int)':
foo.cc:12:22: error: unable to find numeric literal operator 'operator""max'
  return a[hang][lie]+5max(sb(hang+1,lie),sb(hang+1,lie+1));
                      ^~~~
foo.cc:12:22: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes

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