In the description :

String matrixAsString = "0 1\n 2 3";
Matrix matrix = new Matrix(matrixAsString);
matrix.getColumn(1);
Expected : [2, 3]

Why it should be [2, 3] instead of [1, 3] ?

In Java,

t : 331 k : 2
[74, 73, 85, 73, 81, 87]

Expected: 178

I wonder how to come up with this answer.

178 - 74 = 104 (not found in the array)

178 - 73 = 105 (not found in the array)

178 - 85 = 93 (not found in the array)

178 - 73 = 105 (not found in the array)

178 - 81 = 97 (not found in the array)

178 - 87 = 91 (not found in the array)

It seems to me that there is no way to have a subset which the sum of it is 178 in this situation.

It seems like the test case has some problems...

I passed all test cases except the random test case.

My answer is always one more than the expected.

Is there something wrong with the random test?

okay... = =

I understand now, thank both of you :D

In Java, one of the test case is :

Text : uryrtkzp

Expected : U663

But one of the rules is :

Replace all adjacent same digits with one digit.

Did I miss something?

alright, thanks

Hi, I think there is something wrong with the last test case, I might be wrong though...

PlainText : Spy kit
Password : GREAT

for the third char : 'y' in plainText should match with 'E' in Password, right?

y's binary form : 0000000001111001
E's binary form : 0000000001000101
E's binary form(after replace) : 0100010100000000

XOR Operation of y's binary form and E's binary form (afer replace) :
0000000001111001
0100010100000000
= 0100010101111001 (17785 in decimal)

But the test case expects the third char to be (char) 21113

What I want to ask is :

Is

plainChar XOR passChar

or

passChar XOR plainChar

When you say replace first last 8 bit of "second char" in special XOR, do you mean the latter (the char after XOR)?

Special XOR = doing XOR between 2 chars only that the second char's first 8 bits(from the left) are replaced with it's last 8 bits(the right ones).

what is the 'second char' means? Is it always the password's char here?

lol

I think it might be because we are using different version of java. I dont see this error while running the code..

Perhaps you can try:

stack.set(l,""+(Double.parseDouble(stack.get(l)) * -1));

instead of

stack.set(l,String.valueOf(Double.parseDouble(stack.get(l)) * -1));

Just take it, I dont mind :-)