foo.cc: In function 'int main()':
foo.cc:7:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 | scanf("%d%d",&n,&Q);
      | ~~~~~^~~~~~~~~~~~~~
foo.cc:9:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 | for(int i=1;i<=n;i++){scanf("%d",&a[i]);}
      |                       ~~~~~^~~~~~~~~~~~
foo.cc:12:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |         scanf("%d%d",&l,&r);
      |         ~~~~~^~~~~~~~~~~~~~

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