foo.cc: In function 'int main()':
foo.cc:70:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   70 |     for(ll i=1; i<=n; i++)
      |                 ~^~~
foo.cc:71:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   71 |         scanf("%lld",&a[i]);
      |         ~~~~~^~~~~~~~~~~~~~
foo.cc:74:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   74 |         scanf("%lld",&op);//操作方式
      |         ~~~~~^~~~~~~~~~~~
foo.cc:77:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   77 |                 scanf("%lld%lld%lld",&l,&r,&k);
      |                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:82:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   82 |                 scanf("%lld%lld",&l,&r);
      |                 ~~~~~^~~~~~~~~~~~~~~~~~

Found 5 testcases.
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