Compilare: user.cpp: In function ‘int main()’: user.cpp:28: warning: unused variable ‘j’ user.cpp: In function ‘void belman_ford()’: user.cpp:72: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool djikstra()’: user.cpp:82: warning: comparison between signed and unsigned integer expressions user.cpp:106: warning: comparison between signed and unsigned integer expressions