function bai4

n= input ('Nhap n:');

m= input ('Nhap m:');

for i=1:n

for j=1:m

a(i,j)=input(['Nhap phan tu thu ',num2str(j),' cua day a',num2str(i),': ']);

end

disp(a(i,:))

end

i=1;

k=0;

while (i<=n-1) & (k==0)

j=i+1;

while (j<=n) & (k==0)

k= isequal(a(i,:),a(j,:));

j=j+1;

end

i=i+1;

end

if k==1

disp('Trong cac day so nay co it nhat 2 day so giong nhau')

else

disp('Trong cac day so nay ko co day so nao giong nhau')

end