Compilare: main.cpp: In function 'int main()': main.cpp:8:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("divprim.in","r",stdin); ^ main.cpp:9:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("divprim.out","w",stdout); ^ main.cpp:16:17: warning: iteration 1000999 invokes undefined behavior [-Waggressive-loop-optimizations] a[ciur[i]][++l[ciur[i]]]=i; ~~~~~~^ main.cpp:15:18: note: within this loop for(int i=1;i<=1001000;i++) ~^~~~~~~~~ main.cpp:12:18: warning: iteration 1000998 invokes undefined behavior [-Waggressive-loop-optimizations] if(ciur[i]==0) ~~~~~~^ main.cpp:11:18: note: within this loop for(int i=2;i<=1001000;i++) ~^~~~~~~~~