Compilare: user.cpp: In function ‘void bfs(int, int, int*)’: user.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<mat[nd].size()&&ok;i++){ ^ user.cpp: In function ‘int main()’: user.cpp:89:12: warning: unused variable ‘c2’ [-Wunused-variable] int c1,c2; ^ user.cpp:96:22: warning: ‘c1’ is used uninitialized in this function [-Wuninitialized] bfs(c1,n,v); ^