Main.cc: In function ‘int main()’: Main.cc:40:25: error: ‘v’ was not declared in this scope flag=1;v ^ Main.cc:18:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&n,&q); ~~~~~^~~~~~~~~~~~~~~~~~ Main.cc:20:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&op[i],&x[i]); ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~ Main.cc:31:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&l,&r); ~~~~~^~~~~~~~~~~~~~~~~~