Compilare: user.cpp: In function ‘int bfs()’: user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp:19: warning: unused variable ‘y’ user.cpp: In function ‘int main()’: user.cpp:76: warning: unused variable ‘i’ user.cpp:78: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:79: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:81: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:91: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘int bfs()’: user.cpp:51: warning: control reaches end of non-void function /tmp/ccL3kg9g.o: In function `main': user.cpp:(.text+0x6ba): warning: the `gets' function is dangerous and should not be used.