foo.cc: In function 'void gao(int, int, int)':
foo.cc:8:11: warning: unused variable 'b' [-Wunused-variable]
    8 |     int a,b,c=0,y=x;
      |           ^
foo.cc: In function 'void get_sg(int)':
foo.cc:16:13: warning: unused variable 'c' [-Wunused-variable]
   16 |     int a,b,c;
      |             ^
foo.cc: In function 'int main()':
foo.cc:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |     scanf("%d",&T);
      |     ~~~~~^~~~~~~~~
foo.cc:39:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |         scanf("%d%d",&n,&q);
      |         ~~~~~^~~~~~~~~~~~~~
foo.cc:43:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   43 |             scanf("%d",&b);
      |             ~~~~~^~~~~~~~~

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