Compilare: main.cpp: In function 'int main()': main.cpp:36:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("joc18.in", "r", stdin); ^ main.cpp:37:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("joc18.out", "w", stdout); ^ main.cpp: In function 'void precalc()': main.cpp:11:19: warning: iteration 1000003 invokes undefined behavior [-Waggressive-loop-optimizations] if(nrdiv[i] == 0) ~~~~~~~^ main.cpp:10:21: note: within this loop for(int i = 2;i <= maxn;i++) { ~~^~~~~~~