Compilare: user.cpp: In function ‘void build_network(int)’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool BFS(int)’: user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int flux(int)’: user.cpp:98: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:131: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:134: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:140: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result