Compilare: user.cpp: In member function ‘void MinHeap::print()’: user.cpp:155: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void print_graph(Graph&)’: user.cpp:170: warning: comparison between signed and unsigned integer expressions user.cpp:173: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dij(Graph&, int)’: user.cpp:190: warning: comparison between signed and unsigned integer expressions user.cpp:195: warning: comparison between signed and unsigned integer expressions user.cpp:208: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:234: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:235: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:238: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:247: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result