/in/foo.cc:1:0: warning: ignoring #pragma G  [-Wunknown-pragmas]
 #pragma G++ optimize(2)
 
/in/foo.cc: In function 'void FastIO::wer(int, char)':
/in/foo.cc:44:3: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
   while(z[++Z]=x%10+'0',x/=10);if(y)z[++Z]='-';
   ^~~~~
/in/foo.cc:44:32: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
   while(z[++Z]=x%10+'0',x/=10);if(y)z[++Z]='-';
                                ^~
/in/foo.cc:45:3: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
   while(sr[++C]=z[Z],--Z);sr[++C]=T;
   ^~~~~
/in/foo.cc:45:27: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
   while(sr[++C]=z[Z],--Z);sr[++C]=T;
                           ^~
/in/foo.cc: In function 'void whatever::run()':
/in/foo.cc:287:18: warning: 'prev' may be used uninitialized in this function [-Wmaybe-uninitialized]
       update_leaf(cur, old_result, prev->result, old_prefix_or_all, (prev==&nodes[x]?prev->all:prev->prefix));
       ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~