Compilare: user.cpp: In function ‘void read_input()’: user.cpp:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int BellmanFord()’: user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp:52: warning: unused variable ‘start’ user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:81: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:82: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result