Compilare: user.cpp: In function ‘void EulerPath(int)’: user.cpp:25:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i != G[node].size() && G[node].size(); ++ i){ ^ user.cpp:27:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(G[node].size() > i && G[node][i] == son) ^ user.cpp:30:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j != G[son].size(); ++ j) ^ user.cpp: In function ‘void read()’: user.cpp:13:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:16:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^