Compilare: user.cpp: In function ‘void Back(bool, int, int, char*)’: user.cpp:113:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[++ v[0]] = n; ^ user.cpp:119:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[++ v[0]] = n; ^ user.cpp: In function ‘void read()’: user.cpp:69:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bile3.in", "r", stdin); ^ user.cpp:71:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^