Compilare: user.cpp: In function ‘void write()’: user.cpp:66:46: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘floor’ [-Wformat=] printf("%d ", M[i][x.first][x.second]); ^ user.cpp: In function ‘void read()’: user.cpp:22:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:24:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &c[i]); ^