foo.cc: In function 'void dts::main()':
foo.cc:202:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      if ((++tag)+1>ltmst.rec.size())
          ~~~~~~~~~^~~~~~~~~~~~~~~~~
foo.cc:190:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&a[i]);
     ~~~~~^~~~~~~~~~~~~~
foo.cc:205:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%lld%lld%lld",&l,&r,&val);
      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:211:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%lld%lld",&l,&r);
      ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:213:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%lld",&t);
       ~~~~~^~~~~~~~~~~
foo.cc:224:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%lld",&t);
      ~~~~~^~~~~~~~~~~