Compilare: user.cpp: In function ‘void citire()’: user.cpp:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘bool bellman_ford()’: user.cpp:31: warning: suggest parentheses around assignment used as truth value user.cpp:37: warning: comparison between signed and unsigned integer expressions