Compilare: user.cpp: In function ‘int main()’: user.cpp:6:17: warning: unused variable ‘m’ [-Wunused-variable] int lim, n, m, i, j, bit; ^ user.cpp:6:23: warning: unused variable ‘j’ [-Wunused-variable] int lim, n, m, i, j, bit; ^ user.cpp:4:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("psychtraining.in", "r", stdin); ^ user.cpp:5:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("psychtraining.out", "w", stdout); ^ user.cpp:8:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:10:14: warning: ‘lim’ is used uninitialized in this function [-Wuninitialized] while((1 << lim) <= n) ^