foo.cc: In function 'int main()':
foo.cc:60:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   60 |  for(ll i=1; i<=n; i++)
      |              ~^~~
foo.cc:61:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   61 |   scanf("%lld",&a[i]);
      |   ~~~~~^~~~~~~~~~~~~~
foo.cc:64:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   64 |   scanf("%lld",&op);//操作方式
      |   ~~~~~^~~~~~~~~~~~
foo.cc:67:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   67 |     scanf("%lld%lld%lld",&l,&r,&k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:72:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   72 |     scanf("%lld%lld",&l,&r);
      |     ~~~~~^~~~~~~~~~~~~~~~~~

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Found 5 testcases.
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