Compilare: user.cpp: In function ‘void add_player(Trie*, int)’: user.cpp:51:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] go = beat[ s[pos] ]; ^ user.cpp:57:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] go = ids[ s[pos] ]; ^ user.cpp: In function ‘int main()’: user.cpp:107:32: 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:108:34: 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:110:40: 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, &w, &d); ^ user.cpp:121:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s + 1); ^