Compilare: main.cpp: In function 'int main()': main.cpp:12:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(n<p) ~^~ main.cpp:7:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("poarta2.in","r",stdin); ^ main.cpp:8:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("poarta2.out","w",stdout); ^