/in/foo.cc: In function 'int rd()':
/in/foo.cc:9:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(c=='-')w=-1,c=getchar();while(isdigit(c))x=x*10+c-48,c=getchar();return x*w;
  ^~
/in/foo.cc:9:29: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(c=='-')w=-1,c=getchar();while(isdigit(c))x=x*10+c-48,c=getchar();return x*w;
                             ^~~~~