foo.cc: In function 'int main()':
foo.cc:25:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (int i=0;i<n;i++)
     ^~~
foo.cc:27:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  int max=LongSub(a,n);
  ^~~
foo.cc: In function 'int LongSub(int*, int)':
foo.cc:17:9: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return max;
         ^~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。