Compilare: main.cpp: In function 'void add_word(nod_trie*, char*)': main.cpp:31:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod->fii[delta]==0) ^ main.cpp:33:23: warning: array subscript has type 'char' [-Wchar-subscripts] nod->fii[delta]=new nod_trie(); ^ main.cpp:36:28: warning: array subscript has type 'char' [-Wchar-subscripts] add_word(nod->fii[delta],cuv+1); ^ main.cpp: In function 'int search_word(nod_trie*, char*)': main.cpp:46:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod->fii[delta]==0) ^ main.cpp:50:31: warning: array subscript has type 'char' [-Wchar-subscripts] search_word(nod->fii[delta],cuv+1); ^ main.cpp: In function 'bool delete_word(nod_trie*, char*)': main.cpp:66:34: warning: array subscript has type 'char' [-Wchar-subscripts] if(delete_word(nod->fii[delta],cuv+1)==1) ^ main.cpp:69:23: warning: array subscript has type 'char' [-Wchar-subscripts] nod->fii[delta]=0; ^ main.cpp: In function 'int prefix_length(nod_trie*, char*)': main.cpp:82:33: warning: array subscript has type 'char' [-Wchar-subscripts] if(*cuv==0 || nod->fii[delta]==0) ^ main.cpp:85:46: warning: array subscript has type 'char' [-Wchar-subscripts] return 1+prefix_length(nod->fii[delta],cuv+1); ^ main.cpp: In function 'int search_word(nod_trie*, char*)': main.cpp:51:1: warning: control reaches end of non-void function [-Wreturn-type] } ^