Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:32:11: warning: unused variable ‘k’ [-Wunused-variable] int last,k; ^ user.cpp:33:15: warning: unused variable ‘found’ [-Wunused-variable] bool first=0,found; ^ user.cpp: In function ‘int main()’: user.cpp:75:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j != s.size()){ ^ user.cpp:91:6: warning: unused variable ‘h’ [-Wunused-variable] int h = 0; ^