Compilare: user.cpp: In function ‘int main()’: user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol.size() == best) ~~~~~~~~~~~^~~~~~~ user.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ;i < sol.size(); i++) ~~^~~~~~~~~~~~ user.cpp:15:24: warning: unused variable ‘i’ [-Wunused-variable] int m, n, x, best, i, j; ^ user.cpp:15:27: warning: unused variable ‘j’ [-Wunused-variable] int m, n, x, best, i, j; ^