Compilare: main.cpp: In function 'void get_int(int&)': main.cpp:18:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer , sz , 1 , stdin); ^ main.cpp:26:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer , sz , 1 , stdin); ^ main.cpp: In function 'int main()': main.cpp:64:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("papagali.in" , "r" , stdin); ^ main.cpp:65:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("papagali.out" , "w" , stdout); ^ main.cpp:71:18: warning: iteration 300004 invokes undefined behavior [-Waggressive-loop-optimizations] fact1[i] = (((fact1[i - 1] * (2 * i - 1)) % MOD) * (2 * i)) % MOD; ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:69:19: note: within this loop for(i = 1 ; i <= (NMAX + XMAX) / 2 + 5 ; i ++) ~~^~~~~~~~~~~~~~~~~~~~~~~~