Compilare: main.cpp: In function 'void add(Trie*&, char*)': main.cpp:27:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod -> alp[*ch] == NULL) ^ main.cpp:28:38: warning: array subscript has type 'char' [-Wchar-subscripts] ++nod -> let , nod -> alp[*ch] = new Trie; ^ main.cpp:30:23: warning: array subscript has type 'char' [-Wchar-subscripts] add(nod -> alp[*ch] , ch + 1); ^ main.cpp: In function 'bool del(Trie*&, char*)': main.cpp:46:33: warning: array subscript has type 'char' [-Wchar-subscripts] bool ok = del(nod -> alp[*ch] , ch + 1); ^ main.cpp:50:23: warning: array subscript has type 'char' [-Wchar-subscripts] nod -> alp[*ch] = NULL; ^ main.cpp: In function 'void cnt(Trie*, char*)': main.cpp:65:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod -> alp[*ch] == NULL) ^ main.cpp:68:23: warning: array subscript has type 'char' [-Wchar-subscripts] cnt(nod -> alp[*ch] , ch + 1); ^ main.cpp: In function 'void precin(Trie*, char*, int)': main.cpp:76:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod -> alp[*ch] == NULL) ^ main.cpp:79:26: warning: array subscript has type 'char' [-Wchar-subscripts] precin(nod -> alp[*ch] , ch + 1 , ans + 1); ^ main.cpp: In function 'int main()': main.cpp:85:78: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in" , "r" , stdin) , freopen("trie.out" , "w" , stdout); ^ main.cpp:85:78: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]