Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:15: warning: comparison between signed and unsigned integer expressions user.cpp:21: warning: name lookup of ‘i’ changed user.cpp:10: warning: matches this ‘i’ under ISO standard rules user.cpp:15: warning: matches this ‘i’ under old rules user.cpp: In function ‘int main()’: user.cpp:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result