Compilare: user.cpp: In function ‘void Insert(Trie*, int, int)’: user.cpp:22:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[v[lvl]]==0) ^ user.cpp:23:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->son[v[lvl]]=new Trie; ^ user.cpp:24:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] Insert(nod->son[v[lvl]],lvl+1,sz); ^ user.cpp: In function ‘int Find(Trie*, int, int)’: user.cpp:32:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[v[lvl]]==0) ^ user.cpp:34:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] return Find(nod->son[v[lvl]],lvl+1,sz); ^ user.cpp: In function ‘int main()’: user.cpp:45:33: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[31]’ [-Wformat=] fscanf(fi,"%s " ,&A[j]); ^ user.cpp:53:30: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[31]’ [-Wformat=] fscanf(fi,"%s " ,&A[i]); ^ user.cpp:42:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d %d %d " ,&n,&k,&m,&p,&q); ^ user.cpp:45:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s " ,&A[j]); ^ user.cpp:53:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s " ,&A[i]); ^ user.cpp:56:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&x); ^ user.cpp:58:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&poz[i]); ^