Mã chấm: 98673

Main.cc: In function ‘int main()’:
Main.cc:40:5: error: ‘cout’ was not declared in this scope
     cout(tong(a,n,k));
     ^~~~
Main.cc:32:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
Main.cc:34:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&k);
     ~~~~~^~~~~~~~~
Main.cc:37:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&a[i]);
             ~~~~~^~~~~~~~~~~~