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Lỗi biên dịch:

Main.cc: In function ‘int main()’:
Main.cc:40:5: error: ‘printfln’ was not declared in this scope
     printfln("%d",tong(a,n,k));
     ^~~~~~~~
Main.cc:40:5: note: suggested alternative: ‘printf’
     printfln("%d",tong(a,n,k));
     ^~~~~~~~
     printf
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]);
             ~~~~~^~~~~~~~~~~~