Compilare: user.cpp: In function ‘int main()’: user.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; i++) { ^ user.cpp:10:21: warning: unused variable ‘val’ [-Wunused-variable] unsigned long long val, mid; ^ user.cpp:5:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.in", "r", stdin); ^ user.cpp:6:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.out", "w", stdout); ^