Compilare: main.cpp: In function 'int main()': main.cpp:11:21: warning: unused variable 'a' [-Wunused-variable] long long n, i, a, sum = 0, rez = 0; ^ main.cpp:12:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &n); ^ main.cpp:14:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &v[i]); ^