Compilare: user.cpp: In function ‘void bfs()’: user.cpp:20:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (ii=0; ii<P.size(); ii++) ^ user.cpp:30:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0; k<v[q[q1]].size(); k++) ^ user.cpp: In function ‘int main()’: user.cpp:46:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("muzeu.in","r",stdin); ^ user.cpp:47:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("muzeu.out","w",stdout); ^ user.cpp:49:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&N); ^ user.cpp:67:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%c",&muzeu[i][j]); ^