Compilare: main.cpp: In function 'int main()': main.cpp:9:22: warning: unused variable 'last' [-Wunused-variable] int mask,mask2,i,last,j,ans,n,q,cate,maxi,x; ^~~~ main.cpp:9:29: warning: unused variable 'ans' [-Wunused-variable] int mask,mask2,i,last,j,ans,n,q,cate,maxi,x; ^~~ main.cpp:9:33: warning: unused variable 'n' [-Wunused-variable] int mask,mask2,i,last,j,ans,n,q,cate,maxi,x; ^