def tupling(A): return tuple([tuple(a) for a in A]) def f(A,S): if A==B: return True if (tupling(A),S) in Memo: return Memo[(tupling(A),S)] for i in range(SIZE): if 0 in A[i]: j=A[i].index(0) break Flag=False for x,y in V: if 0<=x+i