Compilare: user.cpp: In function ‘int main()’: user.cpp:10:35: warning: unused variable ‘sum2’ [-Wunused-variable] int k,n,a,b,i,j,ok=0,nr,sum=0,sum2=0,c1[4]= {-1,0,1,0},c2[4]= {0,1,0,-1}; ^ user.cpp:17:9: warning: unused variable ‘lin’ [-Wunused-variable] int lin,col; ^ user.cpp:17:13: warning: unused variable ‘col’ [-Wunused-variable] int lin,col; ^ user.cpp:10:26: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] int k,n,a,b,i,j,ok=0,nr,sum=0,sum2=0,c1[4]= {-1,0,1,0},c2[4]= {0,1,0,-1}; ^