/in/foo.cc: In function 'int read()':
/in/foo.cc:7:2: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
  while(!isdigit(ch=getchar())) if(ch=='-') f=-1;x=ch-48;
  ^~~~~
/in/foo.cc:7:49: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
  while(!isdigit(ch=getchar())) if(ch=='-') f=-1;x=ch-48;
                                                 ^
/in/foo.cc: In function 'int query(int, int, int, int, int)':
/in/foo.cc:53:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^