Compilare: user.cpp: In function ‘void readData()’: user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &n, &m); ^ user.cpp:31:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &x, &y); ^ user.cpp: In function ‘void getDiameter()’: user.cpp:61:20: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] int dist = -1, start, node; ^