Compilare: user.cpp: In function ‘void upd(Trie*, int)’: user.cpp:81:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!T -> nxt[ s[ind] ]) ^ user.cpp:82:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] T -> nxt[ s[ind] ] = new Trie(T); ^ user.cpp:83:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] upd(T -> nxt[ s[ind] ], ind + 1); ^ user.cpp: In function ‘int main()’: user.cpp:130:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rps.in", "r", stdin); ^ user.cpp:131:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rps.out", "w", stdout); ^ user.cpp:133:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d\n", &n, &k, &win, &draw); ^ user.cpp:139:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ /tmp/ccYrjALs.o: In function `main': user.cpp:(.text.startup+0xee): warning: the `gets' function is dangerous and should not be used.