/in/foo.cc: In function 'int main()':
/in/foo.cc:25:6: warning: unused variable 't' [-Wunused-variable]
   25 |  int t=0,x,sum1=0,b[20000]={};
      |      ^
/in/foo.cc:25:12: warning: unused variable 'sum1' [-Wunused-variable]
   25 |  int t=0,x,sum1=0,b[20000]={};
      |            ^~~~