/in/foo.cc: In function 'int main()':
/in/foo.cc:15:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=0;i<a2;i++)
     ^~~
/in/foo.cc:17:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  sort(n1,n1+a1);
  ^~~~