Compilare: user.cpp: In function ‘int bfs()’: user.cpp:23: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void bfs2(int)’: user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:77: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:80: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result