Compilare: main.cpp: In function 'int main()': main.cpp:10:34: 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); ^ main.cpp:11:36: 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); ^ main.cpp:24:17: warning: iteration 100003 invokes undefined behavior [-Waggressive-loop-optimizations] log2[i] = log2[i / 2] + 1; ~~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:23:23: note: within this loop for (int i = 2; i <= nMax; i++) { ~~^~~~~~~