Compilare: user.cpp: In function ‘int main()’: user.cpp:15:22: warning: unused variable ‘k2’ [-Wunused-variable] int N,M,X,i,j,val,t,k2,x; ^ user.cpp:15:25: warning: unused variable ‘x’ [-Wunused-variable] int N,M,X,i,j,val,t,k2,x; ^ user.cpp:28:9: warning: ‘mx2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mx,mx2; ^ user.cpp:28:6: warning: ‘mx’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mx,mx2; ^