Compilare: main.cpp: In function 'int main()': main.cpp:60:30: warning: self-comparison always evaluates to false [-Wtautological-compare] if(mask^a[i]&mask!=mask) ~~~~^~~~~~ main.cpp:60:30: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] main.cpp:60:25: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] if(mask^a[i]&mask!=mask) ~~~~^~~~~~~~~~~ main.cpp:62:34: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] int aux=mask^a[i]&mask; ~~~~^~~~~ main.cpp:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[u].size(); i++) ~^~~~~~~~~~~~