Compilare: user.cpp: In function ‘bool Union(int, int)’: user.cpp:47:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int optim()’: user.cpp:134:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &E[i].u, &E[i].v, &E[i].w); ^ user.cpp: In function ‘int main()’: user.cpp:144:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^