Compilare: user.cpp: In function ‘void read()’: user.cpp:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int bellman()’: user.cpp:83: warning: comparison between signed and unsigned integer expressions user.cpp:67: warning: unused variable ‘mn’