Compilare: user.cpp: In function 'void make_trie(char*)': user.cpp:37: warning: unused variable 'j' user.cpp:38: warning: unused variable 'temp' user.cpp:39: warning: unused variable 'lc' user.cpp:39: warning: unused variable 'lm' user.cpp: In function 'int main()': user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int ret(char)': user.cpp:33: warning: control reaches end of non-void function