Compilare: user.cpp: In function ‘int main()’: user.cpp:41:9: warning: unused variable ‘da’ [-Wunused-variable] cuv da; ^ user.cpp: In function ‘bool exista(int)’: user.cpp:104:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=0;k<H[limit].size() && !ok;++k) ^ user.cpp: In function ‘char* caracter(int)’: user.cpp:113:10: warning: address of local variable ‘c’ returned [-Wreturn-local-addr] char c[5]; ^