"The Lift never changes direction until there are no more people wanting to get on/off in the direction it is already travelling"
I'm not a native speaker. I understood that because in that test case there are people on last floor all wanting to go down lift should continue go up
final int[][] queues2 = { new int[0], // 0 new int[0], // 1 new int[]{4,4,4,4}, // 2 new int[0], // 3 new int[]{2,2,2,2}, // 4 new int[0], // 5 new int[]{0,2,4,4,2,2,4,4,2,0} last floor has plenty of people waiting to go down. that's why in my solution lift goes there first. and in my solution i think i don't take those 2's cause lift is going up not down. so i first take down people from higest floor and when lift passes by the floor in down direction and is empty i take down those 2's.

final int[][] queues2 = {
new int[0], // 0
new int[0], // 1
new int[]{4,4,4,4}, // 2
new int[0], // 3
new int[]{2,2,2,2}, // 4
new int[0], // 5
new int[]{0,2,4,4,2,2,4,4,2,0},
array lengths differed, expected.length=7 actual.length=10; arrays first differed at element [3]; expected:<2> but was:<4> capacity is 2; why 2 expected. lift goes up picks up people on floor 2 than they go off on floor 4 then continue go up to flooor 6 and then goes down but stops at floor 4 again cause there are people waiting to go down even if lift is fuull

final int[][] queues2 = {
new int[0], // 0
new int[0], // 1
new int[]{4,4,4,4}, // 2
new int[0], // 3
new int[]{2,2,2,2}, // 4
new int[0], // 5
new int[]{0,2,4,4,2,2,4,4,2,0},
capacity 2
array lengths differed, expected.length=7 actual.length=10; arrays first differed at element [3]; expected:<2> but was:<4> why it expected 2 when lift should go up till the end and on the way down stop if someone waiting to go down even if it is full so it should stop at 4. it goes first to 2 picks up then to 4 then to 6 and then has stop at 4 cause there are people there waiting to go to floor 2?

i rewrote solution from the scratch and now i don't get this problem. i still have problem with time run out. but now those tests are working with totally different solution.Thank you for the link. I will read it.

randomTests
Log
input :4542814
result :4542481
input :71723
result :71372
input :760
Hi
result :721
expected:<706> but was:<721>
Stack Trace
Completed in 107ms
extendedTests
Log
input :513
result :441
input :351
result :315
input :315
result :271
expected:<153> but was:<271>
Stack Trace
Completed in 62ms
Completed in 426ms

in my IDE i get correct results with same tests and same code

i have passed all tests. i pasted code from debugger here and it worked. i thought i had same code here.

The folly of Mr Pong
While Mrs Pong is away visiting her sister, Mr Pong has foolishly set up a ping pong table in his lounge room, and invites his neighbour Mr Ping over for a friendly ping pong session.

When Mr Ping hits the ping pong ball, the ping pong ball goes ping.

When Mr Pong hits the ping pong ball, the ping pong ball goes pong.

Unfortunately, not every hit goes where it was meant to...

Sometimes the ping pong ball hits the net, or bounces off a wall, or it ricochets off Mrs Pong's rather expensive porcelain collection, a light fitting, or various pieces of lounge furniture, before finally coming to rest on the floor. When that happens there are all kinds of bad noises.

Example
A typical rally may sound like this:

ping-pong-ping-pong-ping-pong-ping-pong-dong-tang-bing-tink-donk-donk-donk

Mr Ping served
There were several good returns
Mr Pong hits a bad shot which broke the handle off his wife's 2nd favourite teacup. Oops.
Kata Task
Who scored the most points?

Input
The sounds of one or more rallies.

Output
The name of the winning player: ping or pong

Notes
To score a point the same player must both serve and win the rally.
Whoever picks the ball off the floor will serve next. It's random.
A bad noise is anything other than ping or pong.
A bad noise means whoever hit the ball last hit a bad shot.
For some unknown reason all noises are 4 lowercase characters, and delimited by -
If scores are even, then the winner is the player who did NOT hit the final bad shot.
There are no double hits.
The final rally always ends with the ball on the floor.
All input is valid.

Random test #10: 'pong-ping-pong-ping-boof-bink-doof-ping-smak-bong-ping-pong-ping-pong-ping-pong-ping-pong-ping-pong-flap-funk'. Expected = ping
[pong, ping, pong, ping, boof, bink, doof, ping, smak, bong, ping, pong, ping, pong, ping, pong, ping, pong, ping, pong, flap, funk]
ping :1
pong :2

same thing here. ping and pong scores are 1 and 2 correctly in my solution.

Random test #4: 'pong-donk-pong-ping-pong-ping-pong-ping-pong-flap-poof-doof-pong-ping-pong-ping-pong-ping-pong-ping-pong-ping-bong-poof-voom-pong-ping-pong-ping-klak-wizz-ping-pong-ping-pong-ping-pong-ping-pong-ping-pong-zoom-zoom'. Expected = pong
[pong, donk, pong, ping, pong, ping, pong, ping, pong, flap, poof, doof, pong, ping, pong, ping, pong, ping, pong, ping, pong, ping, bong, poof, voom, pong, ping, pong, ping, klak, wizz, ping, pong, ping, pong, ping, pong, ping, pong, ping, pong, zoom, zoom]
ping :2
pong :2
why did it expect pong. because of such tests i cannot pass attempt even though my solution is working.