Main.cc: In function 'int main()': Main.cc:10:20: error: 'n' was not declared in this scope for(int i=1;i<=n;i++){ ^ Main.cc:13:10: error: 'k' was not declared in this scope cin>>k; ^ Main.cc:21:5: error: expected ';' before 'return' return 0; ^ Main.cc:9:15: warning: unused variable 'K' [-Wunused-variable] long long K,a[101]; ^