Compilare: user.cpp: In function ‘double bellman_ford()’: user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp:54: warning: unused variable ‘j’ user.cpp: In function ‘int main()’: user.cpp:134: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:135: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:136: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:141: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:146: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result