Compilare: user.cpp: In function ‘void readData()’: user.cpp:31:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &X); ^ user.cpp:33:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int a, b, c, cst; scanf("%d%d%d%d", &a, &b, &c, &cst); ^