foo.cc:8:15: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
    8 | int n,q,L[N<<2+5],R[N<<2+5],sum[N<<2+5];
      |              ~^~
foo.cc:8:25: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
    8 | int n,q,L[N<<2+5],R[N<<2+5],sum[N<<2+5];
      |                        ~^~
foo.cc:8:37: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
    8 | int n,q,L[N<<2+5],R[N<<2+5],sum[N<<2+5];
      |                                    ~^~
foo.cc: In function 'int main()':
foo.cc:42:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |     scanf("%d%d",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~
foo.cc:45:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   45 |         scanf("%d",&a[i]);
      |         ~~~~~^~~~~~~~~~~~
foo.cc:60:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   60 |         scanf("%d%d",&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~

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