Compilare: user.cpp: In function ‘bool check(int)’: user.cpp:130:9: warning: unused variable ‘j’ [-Wunused-variable] int j=1; ^ user.cpp: In function ‘int main()’: user.cpp:177:8: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<sol<<"\n"; ^