Compilare: user.cpp: In function ‘int main()’: user.cpp:68:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < L[node].size(); i++) { ^ user.cpp:82:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < L[child].size(); j++) { ^ user.cpp:84:9: warning: unused variable ‘crt’ [-Wunused-variable] int crt = L[child][j]; ^ user.cpp:88:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < L[child].size(); j++) { ^