foo.cc: In function 'void gao(int, int, int)':
foo.cc:8:11: warning: unused variable 'b' [-Wunused-variable]
     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]
     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]
     scanf("%d",&T);
     ~~~~~^~~~~~~~~
foo.cc:39:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         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]
             scanf("%d",&b);
             ~~~~~^~~~~~~~~

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