Compilare: user.cpp: In function ‘int my_upper_bound(int*, unsigned int, int)’: user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (step = 1; step <= sz; step <<= 1); ^ user.cpp: In function ‘int my_lower_bound(int*, unsigned int, int)’: user.cpp:30:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (step = 1; step <= sz; step <<= 1); ^ user.cpp: In function ‘int main()’: user.cpp:44:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("crescator3.in", "r", stdin); ^ user.cpp:45:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("crescator3.out", "w", stdout); ^ user.cpp:47:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:49:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^