Compilare: main.cpp: In function 'void add_trie(trie*, char*)': main.cpp:31:13: warning: unused variable 'b' [-Wunused-variable] 31 | int b = 8 / a; | ^ main.cpp: In function 'bool del_trie(trie*, char*)': main.cpp:47:13: warning: unused variable 'b' [-Wunused-variable] 47 | int b = 8 / a; | ^ main.cpp: In function 'int main()': main.cpp:93:14: warning: variable 'ch' set but not used [-Wunused-but-set-variable] 93 | char *s, ch; | ^~ main.cpp:99:16: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized] 99 | fin >> s; | ^