Compilare: user.cpp: In function ‘void DFS(long int)’: user.cpp:27:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graph[elem].size() && !found; i++) ^ user.cpp:16:23: warning: unused variable ‘mid1’ [-Wunused-variable] long i, maxi = 0, mid1 = -1, mid2 = -1, niv = 1, aux, elem; ^ user.cpp:16:34: warning: unused variable ‘mid2’ [-Wunused-variable] long i, maxi = 0, mid1 = -1, mid2 = -1, niv = 1, aux, elem; ^ user.cpp: In function ‘long int BFS(long int)’: user.cpp:68:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graph[elem].size(); i++) ^