Compilare: user.cpp: In function ‘int solution1()’: user.cpp:35:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < edge[node].size(); ++i) ^ user.cpp: In function ‘int solution2()’: user.cpp:65:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < edge[node].size(); ++k) ^ user.cpp:51:6: warning: unused variable ‘max_d’ [-Wunused-variable] int max_d = 0; ^