Compilare: user.cpp: In function ‘int main()’: user.cpp:8:27: warning: unused variable ‘init’ [-Wunused-variable] unsigned long long n, init, dif, i, j; ^ user.cpp:8:33: warning: unused variable ‘dif’ [-Wunused-variable] unsigned long long n, init, dif, i, j; ^ user.cpp:8:38: warning: unused variable ‘i’ [-Wunused-variable] unsigned long long n, init, dif, i, j; ^ user.cpp:8:41: warning: unused variable ‘j’ [-Wunused-variable] unsigned long long n, init, dif, i, j; ^ user.cpp:5:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("puncte2.in", "r", stdin); ^ user.cpp:6:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("puncte2.out", "w", stdout); ^ user.cpp:9:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llu", &n); ^