Compilare: user.cpp: In function ‘void Union(int, int, std::vector<Arb*>)’: user.cpp:45:55: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (arbsVect[aParent]->rank = arbsVect[bParent]->rank) { ^ user.cpp: In function ‘int main()’: user.cpp:55:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &N, &M); ^ user.cpp:63:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d", &x, &y, &c); ^