Compilare: main.cpp: In function 'long long int how_many_numbers_do_not_have_0_from_1_to_n(long long int)': main.cpp:36:18: warning: unused variable 'i' [-Wunused-variable] 36 | int cn, nrcif, i, sol; | ^ main.cpp: In function 'long long int find_last_13(long long int, long long int)': main.cpp:75:13: warning: unused variable 'valmin' [-Wunused-variable] 75 | int i, j, valmin, newn; | ^~~~~~ main.cpp: In function 'int main()': main.cpp:103:13: warning: unused variable 'i' [-Wunused-variable] 103 | int n, k, i; | ^