Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:40:17: warning: variable ‘tt’ set but not used [-Wunused-but-set-variable] int tt; ^ user.cpp: In function ‘int main()’: user.cpp:132:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nr[j - 1] < pos[j - 1].size()) { ^ user.cpp:127:9: warning: variable ‘sum’ set but not used [-Wunused-but-set-variable] int sum = 0; ^