Compilare: user.cpp: In function ‘void bfs()’: user.cpp:38:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[k].size() ; i++){ ^ user.cpp:31:9: warning: unused variable ‘i’ [-Wunused-variable] int i,k; ^ user.cpp: In function ‘bool solve(int, int)’: user.cpp:64:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[nod].size() ; i++) ^ user.cpp:69:1: warning: control reaches end of non-void function [-Wreturn-type] } ^