Compilare: user.cpp: In function ‘void represent_tree(nod*, char*&)’: user.cpp:38:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n->fii.size(); i++) { ^ user.cpp: In function ‘bool kmp(char*, char*)’: user.cpp:84:23: warning: value computed is not used [-Wunused-value] for (k = 0; *T; *T++) { ^ user.cpp:81:9: warning: unused variable ‘i’ [-Wunused-variable] int i, k; ^