Compilare: user.cpp: In function ‘int rezolva(int)’: user.cpp:12:27: warning: variable ‘cs’ set but not used [-Wunused-but-set-variable] int lg,i,x,y,nr=0,s=0,cs,j,inv=0; ^ user.cpp:12:30: warning: variable ‘j’ set but not used [-Wunused-but-set-variable] int lg,i,x,y,nr=0,s=0,cs,j,inv=0; ^ user.cpp:12:32: warning: unused variable ‘inv’ [-Wunused-variable] int lg,i,x,y,nr=0,s=0,cs,j,inv=0; ^ user.cpp: In function ‘int main()’: user.cpp:65:17: warning: NULL used in arithmetic [-Wpointer-arith] if(a[i][0]!=NULL) ^ user.cpp:55:6: warning: unused variable ‘v’ [-Wunused-variable] char v; ^