Compilare: user.cpp: In function ‘void read_input()’: user.cpp:82:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &N, &L); ^ user.cpp:83:46: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(A + 1, (L+1) * sizeof(char), stdin); ^