Compilare: user.cpp: In function ‘int main()’: user.cpp:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void push_m_ad(std::priority_queue<muchie, std::vector<muchie, std::allocator<muchie> >, cost_bigger>&, int)’: user.cpp:56: warning: comparison between signed and unsigned integer expressions