Compilare: user.cpp: In function ‘int main()’: user.cpp:42:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(p->urm[s2[j]]==NULL) ^ user.cpp:44:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] p->urm[s2[j]]=new nod; ^ user.cpp:46:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] p=p->urm[s2[j]]; ^ user.cpp:56:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(p->urm[s[i+j]]==NULL) ^ user.cpp:60:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] p=p->urm[s[i+j]]; ^ user.cpp:22:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("enigma.in","r",stdin); ^ user.cpp:23:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("enigma.out","w",stdout); ^ user.cpp:24:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:25:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ user.cpp:33:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s2+1); ^ /tmp/ccr2tMZC.o: In function `main': user.cpp:(.text.startup+0x72): warning: the `gets' function is dangerous and should not be used.