Compilare: user.cpp: In member function ‘void MinHeap::print()’: user.cpp:152: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void print_graph(Graph&)’: user.cpp:167: warning: comparison between signed and unsigned integer expressions user.cpp:170: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dij(Graph&, int)’: user.cpp:187: warning: comparison between signed and unsigned integer expressions user.cpp:194: warning: comparison between signed and unsigned integer expressions user.cpp:202: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:220: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:221: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:224: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:233: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result