Compilare: main.cpp: In function 'bool AddLetter(int, bool, int)': main.cpp:45:31: warning: array subscript has type 'char' [-Wchar-subscripts] if (tree[node].next[letter] != 0) ^ main.cpp:47:40: warning: array subscript has type 'char' [-Wchar-subscripts] suffix = tree[node].next[letter]; ^ main.cpp:58:27: warning: array subscript has type 'char' [-Wchar-subscripts] tree[node].next[letter] = nodes; ^ main.cpp:68:58: warning: array subscript has type 'char' [-Wchar-subscripts] tree[nodes].fail = tree[node].next[letter]; ^ main.cpp: In function 'int main()': main.cpp:79:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] cin >> s + 1; ~~^~~ main.cpp:81:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] cin >> s + n + 1; ~~~~~~^~~