Compilare: user.cpp: In function ‘int bfs()’: user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:99: warning: comparison between signed and unsigned integer expressions user.cpp:121: warning: comparison between signed and unsigned integer expressions user.cpp:133: warning: comparison between signed and unsigned integer expressions user.cpp:76: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:77: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp:81: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result