Compilare: user.cpp: In function ‘void HPD(int, int)’: user.cpp:41:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size(); ++i) { ^ user.cpp:54:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size(); ++i) { ^ user.cpp: In function ‘void set_path_level(int, int)’: user.cpp:80:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size(); ++i) { ^ user.cpp: In function ‘void HPD(int, int)’: user.cpp:51:30: warning: ‘max_path’ may be used uninitialized in this function [-Wmaybe-uninitialized] set_path(x, max_path); ^