Compilare: user.cpp: In function ‘int main()’: user.cpp:75:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(tm->po[s2[j]]==NULL) ^ user.cpp:77:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] tm->po[s2[j]]=new nod(); ^ user.cpp:78:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] tm->po[s2[j]]->tata=tm; ^ user.cpp:79:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] tm->po[s2[j]]->ch=s2[j]; ^ user.cpp:81:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] tm=tm->po[s2[j]]; ^ user.cpp:92:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(tm->po[si[i]]==NULL && tm!=root) ^ user.cpp:96:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(tm->po[si[i]]!=NULL) ^ user.cpp:98:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] tm=tm->po[si[i]]; ^ user.cpp:62:17: warning: unused variable ‘ans’ [-Wunused-variable] int n,i,j,l,ans=0; ^ user.cpp:60:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin); ^ user.cpp:61:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.out","w",stdout); ^ user.cpp:65:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(si+1); ^ user.cpp:66:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:69:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s2+1); ^ /tmp/cccgWkWc.o: In function `main': user.cpp:(.text.startup+0xa6): warning: the `gets' function is dangerous and should not be used.