Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:43:40: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for (int i = 1; i <= N; i++) Used[i] = Tata[i] = 0; ^ user.cpp: In function ‘void read()’: user.cpp:30:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &N, &M); ^ user.cpp:33:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d", &X, &Y, &Z); ^