foo.cc: In function 'void cdq(int, int)':
foo.cc:25:10: warning: unused variable 'c' [-Wunused-variable]
   25 |  int a,b,c,d,e,mid=(l+r)/2;
      |          ^
foo.cc: In function 'int main()':
foo.cc:72:7: warning: operation on 'len' may be undefined [-Wsequence-point]
   72 |   sum[++len].x=sum[len].y=b-1;sum[len].si=1;sum[len].xu=a;
      |       ^~~~~
foo.cc:61:12: warning: unused variable 'd' [-Wunused-variable]
   61 |  int a,b,c,d,e;
      |            ^
foo.cc:61:14: warning: unused variable 'e' [-Wunused-variable]
   61 |  int a,b,c,d,e;
      |              ^

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