Compilare: user.cpp: In function ‘int main()’: user.cpp:35:10: warning: unused variable ‘x’ [-Wunused-variable] char x; ^ user.cpp: In function ‘void Add()’: user.cpp:57:13: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if ( nod -> next[S[i] - 'a'] == nullptr ) ^~ user.cpp:59:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ nod = nod -> next[S[i] - 'a']; ^~~