Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:46:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (v[nod].fii[s[p]]==0){ ^ user.cpp:48:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[nod].fii[s[p]]=m; ^ user.cpp:50:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] update(p+1,v[nod].fii[s[p]]); ^ user.cpp: In function ‘int main()’: user.cpp:64:33: 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:65:35: 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:68:37: 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:72:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccfa7nrG.o: In function `main': user.cpp:(.text.startup+0xa0): warning: the `gets' function is dangerous and should not be used.