Compilare: user.cpp: In function ‘int nextint()’: user.cpp:39:9: warning: unused variable ‘cnt’ [-Wunused-variable] int cnt = 0; ^ user.cpp: In function ‘char* word()’: user.cpp:56:9: warning: unused variable ‘cnt’ [-Wunused-variable] int cnt = 0; ^ user.cpp: In function ‘int pref(trie*, char*, int)’: user.cpp:121:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(root->m[a] == 0 || root->m[a]->cnt == 0) { ^ user.cpp:121:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(root->m[a] == 0 || root->m[a]->cnt == 0) { ^ user.cpp:124:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] return pref(root->m[a], c+1, crr+1); ^ user.cpp: In function ‘char nextch()’: user.cpp:28:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAX, fin); ^