Compilare: main.cpp: In function 'int main()': main.cpp:66:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("xreverse.in", "r", stdin); ^ main.cpp:67:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("xreverse.out", "w", stdout); ^ main.cpp:72:9: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] md[i] = (i >= k ? md[i-k] : i); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:71:20: note: within this loop for (int i = 1; i <= N; i++) { ^