Compilare: main.cpp: In function 'int main()': main.cpp:64:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll i = 0;i < elem.size();i++) ~~^~~~~~~~~~~~~ main.cpp:75:44: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if(mask & (1 << pz[x]) == 0) ~~~~~~~~~~~~~^~~~ main.cpp:48:10: warning: unused variable 'j' [-Wunused-variable] ll i,j; ^