Compilare: user.cpp: In function ‘int main()’: user.cpp:48:41: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for (int j = 1; j <= n - pow2(i - 1); j++) { ^ user.cpp:23:23: note: in definition of macro ‘pow2’ #define pow2(x) (1 << x) ^ user.cpp:49:60: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] D[i][j] = min(D[i - 1][j], D[i - 1][j + pow2(i - 1)]); ^ user.cpp:23:23: note: in definition of macro ‘pow2’ #define pow2(x) (1 << x) ^ user.cpp:30:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carici.in", "r", stdin); ^ user.cpp:32:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.in", "r", stdin); ^ user.cpp:33:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.out", "w", stdout); ^